Introduction
Meriam Instrument is a leading manufacturer of instrumentation for the precise measurement of flow, pressure
and level. As shown below, the product line includes primary elements and indicators to serve both calibration
and process measurement applications for pressure, flow and level applications.
CALIBRATION
& TEST
PROCESS
PRESSURE
PROCESS
FLOW
DP
P gauge
P vacuum
P absolute
Gas Flow
MICROMANOMETER
SMART MANOMETER
MERICAL
MERICAL II
LAMINAR FLOW
ELEMENTS / SYSTEMS
DP
P gauge
P vacuum
P absolute
MANOMETERS - LIQUID
FILLED AND DIGITAL
BELLOWS DP GAUGES
BOURDON P GAUGES
DIGITAL P GAUGES
SMART GAUGES
SMART TRANSMITTERS
Elements
Measurements
Indicators
LAMINAR FLOW ELEMENT
ACCUTUBE AVERAGING
PITOT
ORIFICE PLATES & FLANGES
DP
P gauge
P absolute
MANOMETERS
BELLOWS DP GAUGES
SMART GAUGES
SMART TRANSMITTERS
LAMINAR FLOW
SYSTEMS, FLOPAC,
SMV TRANSMITTERS
FLOW SYSTEMS
Measurement Type
PROCESS
FLOW
DIRECT HEAD ON VENTED
TANKS
BUBBLER SYSTEMS FOR
VENTED OR PRESSURIZED
TANKS
Measurements
Indicators
DP
P gauge
MANOMETERS
BELLOWS DP GAUGES
SMART GAUGES
SMART TRANSMITTERS
P= Pressure DP= Differential Pressure
Since 1911 Meriam products have been used around the world in applications as diverse as chemical processing,
oil drilling rigs, respiratory therapy and laboratory experiments. Originally a family run business, Meriam
became a Scott Fetzer Division in 1969. Other divisions in the Scott Fetzer Corporation include Kirby Vacuum
Cleaner, World Book, Campbell Hausfeld, Adalet and several others. Since 1986, Scott Fetzer is a wholly
owned subsidiary of Berkshire Hathaway.
Today, Meriam offers many more industrial instruments than ever before, most with versatility not available
elsewhere. With design, manufacturing and application support headquartered in Cleveland, Ohio, Meriam’s
ability to solve measurement problems is extensive and our technical data is yours for the asking.
This brochure will provide an overview of the Meriam product groups. For more information on specific
products, request our Product Bulletins containing detailed data. Product Bulletins are available directly from
Meriam or from our field representatives conveniently located throughout the United States and the world.
We invite your inquiries and are ready to help in solving your measurement and calibration problems.
2
Table of Contents
Meriam Product Groups
Introduction
Page 2
Table of Contents
Page 3
• Meri-Cal II
Page 4-5
Portable, multifunction, multi-sensor Calibrator for pressure transmitters. ±0.025% F.S. accuracy.
Sensor ranges from 20" H2O to 2000 PSIG, 2000 mm Hg Abs, ±50 volts/mA. Data Logging option.
• Meri-Cal (original)
Page 6
Portable, multifunction Calibrator for pressure transmitters. ±0.05% Reading, ±1 count accuracy.
Sensor ranges of 200" H2O and 2000" wc, ±30 volts/mA
• Smart Manometer models 350,351 and Precision Absolute Manometer model 355
Page 7-9
Portable,Digital Manometer, ±0.025% FS accuracy. Ranges 20" H2O to 2000 PSIG, 2000 mm Hg A
• Portable Digital Manometer
Page 9
Portable Electronic Manometer, ±0.25% Reading, ±5 counts. Ranges 20" H2O to 100 PSI, 1500mm Hg A
• Smart Pressure Gauges
Page 10-12
±0.05% FS accuracy for measuring gauge pressure, vacuum and differential pressure from 20"
H2O to 2000 PSIG or absolute pressure from 0 to 2000 mm Hg Absolute.
• Minigauge Digital Pressure Gauge
Page 13
2.75" diameter digital pressure gauge, ±1.0% FS accuracy. Pressures from 50 to 10,000 PSIG
• Merigauge Digital Pressure Gauge
Page 14-15
3.75" diameter digital pressure gauge, ± 0.25% FS or optional ±0.10% FS accuracy. Pressures from
vacuum to 6000 PSIG. Output options include two SPDT relays and / or 4-20 mA / 1-5 VDC
• 1500 Smart Transmitter
Page 16-17
±0.025% FS accuracy, RS485 digital and analog (V or mA) output selections. DIN rail or flange
mount. Pressure, differential or absolute pressure from 20" H2O to 2000 PSIG, 2000 mm Hg A
• Bellows Type Differential Pressure Indicators and Indicating Switches
Page 18-19
±0.75% FS accuracy to indicate differential or gauge pressure up to 500 PSID. One or two switches
available with or without explosion-proof enclosure. Several wetted material options
• Bourdon Tube Pressure Gauges
Page 20
2 1⁄ 2" to 4 1⁄ 2" diameter pressure gauges, lower or back mount stems, vacuum to 15,000 PSIG
• Manometer Accessories
Page 21
Pressure / vacuum sources and variators, Sight Feed Bubblers, Line Traps, Check Valves, Seal Pots
• Manometers
Page 22-23
Liquid filled U-tubes, Well types, Inclined tubes and Micromanometers for measuring pressure and
vacuum. SWP to 500 PSI. Accuracy is typically ± 1⁄ 2 of smallest graduation.
• Laminar Flow Elements
Page 24-27
Accuracy of ± 0.86% of Reading for flow measurement of 1 SCCM to 2,250 SCFM with turn-down
of 20:1 or more. Special models are available to 15,000 SCFM. Improved accuracy options.
• Accutube Flow Sensors
Page 28-38
Accuracy of ± 1% Reading, repeatability of 0.1%. For pipe sizes 1⁄ 2" to 20’. In-line, insertion, flange
mount, wet tap, direct transmitter mount, integral RTDs. For liquid, gas and steam measurement.
• Orifice Plates & Orifice Flanges
Page 39-40
Accuracy of ± 1% FS with 4:1 turn down. General-purpose measurement of liquid, gas and steam
• Flow Measurement Systems
Page 41-43
- LFS-1 (Laminar Flow System-1) for Laminar Flow Elements (LFEs). Automated measurements
of gas flow with ± 0.6% Reading accuracy over 10:1 turn down; ± 0.7% over 20:1 turndown.
- FLOPAC digital flow system for LFEs uses customer’s PC for calculations and data storage
- SMV Transmitter Flow Systems for direct mounting to Accutube averaging pitot tubes takes
the place of individual P and DP Transmitters and flow computer. Convenient cost saver.
3
Meri-Cal II
Model 3600 & 3610 Pressure Calibrator
Model 3600 Meri-Cal II is a microprocessor
based pressure calibrator with 5 digit resolution
and NIST traceability. Two pressure sensors and
one electrical sensor installed in the Meri-Cal II
will allow measurement of differential and static
pressure, plus current and voltage in one unit.
Any two of these measurements are displayed
on a 4 line by 20 character alphanumeric display,
making calibration of transmitters and
transducers easy.
The Model 3610 Meri-Cal II incorporates a
convenient Data Logging mode and on-board
memory to provide calibration documentation at
the stroke of a key. Calibration procedures can
be set up quickly using the Windows ‘95 Data
Logging Program. Up to 20 PC Calibration files
of up to 20 points each can be downloaded from
a PC. This allows the 3610 to prompt the user
with required calibration points. Another 20
Manual Calibrations files can be stored directly
through the keypad.
Specifications
• Approvals: CE compliant (Optional)
• Display: 4 line x 20 character alpha-numeric 5 full
digit resolution
• NIST traceability: NIST certificate supplied for all
models.
• Power: 9-volt alkaline battery with user enabled
automatic shut-off.
• Optional 9 volt lithium batteries can also be used and
are recommended below 32˚ F (0˚ C).
• Temperature:
Storage: -40˚F to 140˚F (-40 to 60˚C)
Operating: 23˚F to 122˚F (-5 to 50˚C)
• Process connection: 1/8” female NPT, 316ss
• Media compatibility: Non-isolated sensor (DN) for
clean, dry, non-corrosive gases. Isolated sensor (GI
and AI) for fluids compatible with 316ss.
• Pressure limits: Twice range on GI/AI units. Twice
range on DN units when pressurized on high side
only and 150 PSI (10.5 Kg/cm2) static when applied
to both sides of the sensor simultaneously.
• Enclosure: 30 ounces. (8.5”L x 5.2”W x 3.0”D) ABS
plastic case
• Accuracy: Pressure sensor ± 0.05% of F.S. or
optional ± 0.025% of F.S.
Electrical measurements ± 0.025% of F.S. Accuracy
includes all effects of linearity, repeatability, hysteresis
and temperature over the range 23˚F to 122˚F
3600 Standard Features
• Selectable Engineering Units - PSI, inches H2O (4˚C,
20˚C, and 60˚F references), kg/cm2, Kilopascals, mBars,
Bars, mm Hg, inches Hg, cm H2O, user definable units.
• Auto Shut-off - occurs after 10 minutes without a
new keystroke. User can disable this feature.
• DAMPING (averaging) - selectable from 0.1 to 25
seconds to dampen pulsation and stabilize the display.
4
• MIN/MAX capture - minimum and maximum measured
values are captured. Capture speed is equal to the selected
damping rate.
• HOLD - toggle on/off function freezes display.
• ZERO - provides automatic re-zeroing of the sensors.
Soft Carrying Case with adjustable shoulder strap.
Meri-Cal II
Model 3600 & 3610 Pressure Calibrator
• Manual Data Logging Mode - field defined data logging
for transmitter or transducer calibrations or documentation of local indicators or flow computers.
• DB-9 serial connector - used for downloading
calibration files from a PC to the 3610 and for uploading
stored calibration results to the PC (Requires Optional
Software)
3610 Features (Additional to 3600)
• Memory - Non-volatile data-logging memory for 40
calibration files with up to 20 points per file.
• PC Data Logging Mode - prompts user to follow calibrtion procedures downloaded from a PC (Requires
Optional Software). Stores AS FOUND and AS LEFT
data in memory.
Ordering Information
MERI-CAL II (includes current / voltage sensor):
3600 Select one or optionally two sensors from
selection below. Order same accuracy for units
with two sensors.
3610 Adds onboard memory card and PC Data
logging to the model 3600(Requires software and
cable- see accessories)
SENSORS:
.05%
DN0200
DN2000
GI0020
GI0200
GI2000
AI2000
0-200” H2O
0-2000” H2O
0-20 PSI
0-200 PSI
0-2000 PSI
0-2000 mm Hg
.1%
Differential
Differential
Gauge
Gauge
Gauge
Absolute
DN0020
.025%
0-20” H2O
DN0200
DN2000
GI0020
GI0200
GI2000
AI2000
0-200” H2O
0-2000” H2O
0-20 PSI
0-200 PSI
0-2000 PSI
0-2000 mm Hg
Differential
Differential
Gauge
Gauge
Gauge
Absolute
Differential
To Order a Meri-Cal II with 200” Differential and 2000 PSI sensor with .025% accuracy. The order code
is as follows: 3600-DN0200-GI2000-025 (add “-025” extension for accuracy).
Consult factory or your local Meriam Representative for Pricing
MERI-CAL II MODEL 3610 DATA LOGGING and
COMMUNICATIONS SOFTWARE for PC’s
The Data Logging and Communications Software for the Meri-Cal II is Windows ‘95 compatible.
Features for the program include:
• SET TIME button to synchronize the Meri-Cal II real time clock with the PC’s.
• DATA ACQ provides automated data acquisition (10Hz rate) using the PC with the Meri-Cal II.
The Meri-Cal II Model 3610 will function as a data logging calibrator for pressure and electrical signal
in the PC Data Logging Mode.
• CREATE CAL FILE facilitates the uniform creation of individual calibration files for each transmitter
or transducer ID number. After entering a Serial/Tag # of up to 15 characters, Channel 1 and 2
Sensors are defined by clicking on the sensor type and desired units for each. The software allows up
to 20 PC Calibration and 20 manual (20 points each) calibration files to be uploaded to the 3610.
• SEND PC CAL FILES downloads selected files to the Meri-Cal II.
• RECEIVE PC (and MANUAL) CAL FILES uploads stored calibration data from the Meri-Cal II to the PC.
• PRINT commands allow printing of calibration data previously uploaded to the PC.
The Meri-Cal II guides the user through the calibration procedure.
The PC interface option allows for the display of PREV: the most
recent as left data, FOND: the present as found data, and NOML:
The desired present point to calibrate as programmed through
the PC interface. With a simple keystroke this information is
stored in non-volatile memory. The Meri-Cal II is then interfaced
with the host PC for long-term information storage and printing
of calibration certificates.
5
Meri-Cal Digital Manometer/Calibrator
The Meri-Cal is a portable digital manometer /
calibrator for pressure and differential pressure
measurement. It features high accuracy and
rugged design that brings laboratory test and
calibration capability to the field.
Meri-Cal’s display simultaneously indicates
pressure (or differential pressure) and electronic
transducer/transmitter output in any of eight
key selectable engineering units. Meri-Cal
continues to provide the most cost effective
and useful method of precise measurements.
Standard Features on the Meri-Cal Digital Manometer/Calibrator
• Media compatibility: Non-isolated sensor for clean,
dry, non-corrosive gases.
• Auto Zero: A push of a button automatically
establishes zero. There is no need to compute
compensation factors for local gravity, temperature,
or head difference due to the location of the tester vs.
the unit under test.
• Engineering units: in H2O at 20˚C, cm H2O, PSI,
in Hg at 0˚C, mm Hg, Kg/cm2, kPa, mBar and
user scaled.
• Resolution: Auto-ranging for optimal accuracy and
resolution of the display for both pressure and
electrical inputs.
• Electrical Measurement:
Voltage: 0 to 30 Vdc
Current: 0 to 30 mAdc
• Accuracy: Pressure: ± 0.1% of reading, ± 1 count,
Voltage/Current: ± 0.1% of reading, ± 2 counts.
Optional ± 0.05% of reading, ±1 count on pressure
sensors. Accuracy includes the combined effects of
linearity, hysteresis, repeatability and temperature
over the calibrated range.
• Approvals: CSA certification for intrinsic safety use
in Class 1, Groups A, B, C and D areas. CE and
CENELEC approvals. (Both Optional)
• Display: 8 digit (4 pressure or DP and 4 voltage or
current) LCD type with .3" high (7.6 mm) digits.
• NIST traceability: NIST certificate supplied for all
models.
• Power: NI-CAD Rechargeable, Minimum of 40 Hrs
@ 70˚F (21˚C); 20 Hrs @ -20˚F (-29˚C)
• Temperature:
Storage: -40˚F to 140˚F (-40˚C to 60˚C)
Operating: -20˚F to 122˚F (-6.7˚C to 50˚C)
Effect: None within the calibrated range of -4˚ to 104˚F
• Process connection: 1/8" OD Presto-lok
• Enclosure: 1.1 pounds (0.5 kg) 4 x 7.5 x 1.9
(102mm x 191mm x 48mm). Impact resistant
ABS material.
• Pressure limits: Twice range on Gauge (LP) units.
Twice range on Differential (DP) units when pressurized on high side only and 150 PSI (10.5 Kg/cm2)
static when applied to both sides of the sensor
simultaneously.
INCHES
CM
INCHES
MM
MODEL*
LP200I
DP200I
H20
200.0
200.0
H20
508.0
508.0
PSIG
7.21
7.21
HG
14.68
14.68
HG
373.0
373.0
KG/CM2
0.507
0.507
kPa
49.70
49.70
mBar
497.0
497.0
LP2000I
DP2000I
2000.
2000.
5080.
5080.
72.10
72.10
146.8
146.8
3730.
3730.
5.070
5.070
497.0
497.0
4970.
4970.
LP models measure gauge pressure only. DP models can be used to measure differential pressure, gauge pressure and vacuum.
* For CSA approved models change the “I” suffix to “C” For CENELEC approved models change the “I” suffix to “E”
6
Smart Manometer
Digital Manometer
Meriam Instrument's 350 Series Smart
Manometers are the first pressure measuring instruments with accuracy of ± 0.025%
of F.S. at truly low prices. They are microprocessor-based pressure sensing devices
that can measure gauge, differential,
absolute or vacuum pressure. The displays
can read out in any of eleven engineering
units and can also be scaled to special user
units for pressure. Differential models offer
a flow function to display square root flow
rate in user defined units. An adjustable
damping feature minimizes the effects of
pulsating pressures. A Min/Max function
captures the extremes of pulsating or other
varying pressure signals and a Hold button
can freeze the display at any point of interest.
Standard Features on the 350 Series Digital Manometer Family
• Approvals: CE compliant and CSA Intrinsically safe
(Optional)
• Display: 5 significant digit LCD (0.25" high) 2 line x 16
alphanumeric characters
• NIST traceability: NIST certificate supplied with
all models.
• Damping rates: User selectable from 0.1 to 25 seconds
• Power: 9-volt alkaline battery with user enabled
automatic shut off. 9 volt Lithium battery is recommended for use below 32˚F (0˚C)
• Temperature:
Storage: -40˚F to 140˚F (-40 to 60˚C)
Operating: 23˚F to 122˚F (-5 to 50˚C)
• Min/Max capture - capture speed is equal to the
selected damping rate
• Process connection 1/8" female NPT, 316ss
• Media compatibility: Non-isolated Differential sensor
(DN) for clean, dry, non-corrosive gases. Isolated
Gauge and Absolute sensor (GI and AI) for fluids
compatible with 316ss.
• Pressure limits: Twice range on Gauge and Absolute
(GI and AI) units. Twice range on Differential (DN)
units when pressurized on high side only and 150
PSI (10.5 Kg/cm2) static when applied to both sides
of the sensor simultaneously.
• Engineering units: inches of H2O (with three choices
of reference temperature), PSI, mm of Hg, inches of
Hg, mBars, Bars, kPa, kg/cm2, cm of H2O and user
selectable scaling.
• Contrast adjustment: Adjusts display for easier viewing
• Enclosure: 14 ounce (6.5" X 3.6" X 2.25") ABS plastic case.
• Auto Shut-Off: user selectable shut-off time period.
Model 350 Smart Manometer Test Gauge
Model 351 Smart Manometer Calibrator
• Accuracy *: ± 0.05% of F.S.
± 0.1% of F.S. 20" H2O differential range only
• Accuracy *: ± 0.025% of F.S.
• Range: 20" H2O, 200" H2O and 2000" H2O DP 20 PSIG,
200 PSIG and 2000 PSIG Gauge 2000 mm Hg Absolute
• Range: 200" H2O, 200" H2O and 2000" H2O 20 PSIG,
200 PSIG and 2000 PSIG 2000 mm Hg Absolute
* Includes the combined effects of temperature, linearity,
repeatability, hysteresis and resolution.
7
Precision Absolute Manometer
355 Precision Absolute Manometer
Meriam’s model 355 Precision Absolute Manometer
puts calibration bench accuracy in a portable,
handheld unit. The pressure sensor is all 316ss
allowing it to be used with liquids, gases and
corrosives compatible with 316ss. This combination
of accuracy and fluid compatibility makes the 355
ideal for test or process applications.
The model 355 has a programmable altitude function that allows the user to enter the site altitude
above sea level in feet or meters. This allows the
user to chose between displaying local barometric
pressure or pressure corrected to sea level. User
set altitude or altitude based on U.S. Standard
Atmosphere of 1962 can be displayed. The altitude
function used with the Min/Max and Tare makes
the model 355 useful as a surveyor’s tool by
accurately measuring changes in altitude.
Standard Features on the Model 355 Precision Absolute Manometer
• Approvals: CE compliant and CSA Intrinsically
safe (Optional)
• Tare: Sets display to zero to allow measurement of
vacuum, gauge pressure or change in altitude.
• Display: 5 significant digit LCD (0.25” high)
2 line x 16 alphanumeric characters
• Min/Max capture - capture speed is equal to the
selected damping rate
• NIST traceability: NIST certificate supplied for
all models.
• Damping rates: User selectable from 0.1 to 25 seconds
• Power: 9-volt alkaline battery with user enabled
automatic shut off. 9 volt Lithium battery is recommended for use below 32˚F (0˚C)
• Temperature:
Storage: -40˚F to 140˚F (-40 to 60˚C)
Operating: 23˚F to 122˚F (-5˚ to 50˚C)
• Process connections: 1/8” female NPT, 316ss.
• Enclosure: 14 ounce (6.5” X 3.6” X 2.25”) ABS
plastic case.
• Media compatibility: Isolated AI sensor for fluids
compatible with 3l6ss.
• Pressure limits: 4000 mm Hg Abs (AI0900 and AI2000)
• Selection of engineering units: mm Hg, PSI, in. Hg,
mbar, Bar, kPa, Torr.
• Altitude: Displayed in feet or meters. Can be set by
user based on map or trig marker information.
Standard altitude uses U.S. Standard Atmosphere of
1962 data.
• Contrast adjustment: Adjusts display for easier
viewing
• Accuracy:
355-AI0900
± 0.02% F.S. (F.S.=900 mm Hg abs)
355-AI2000
± 0.015% F.S.* from 0-1000 mm Hg A
±0.025% F.S.* from l000-2000 mmHg A
*(F.S. = 2000 mm Hg Abs)
355 Ordering Information
355-AI0900
355-AI2000
8
0-900 mm Hg Abs. (Includes soft vinyl carrying case)
0-2000 mm Hg Abs. (Includes soft vinyl carrying case)
Smart Manometer Accessories
Several accessory items are available for Smart Manometers
and Digital Manometers to help complete your pressure calibration needs. Multi-bay carrying cases provide convenient
portability and organization of fittings, hand pumps, tubing
and up to two manometers.
Description
Part Number
Dual Bay Carrying Case(see photos at left)
Single Bay Carrying Case for Digital Mano
Pressure Hand Pump
Vacuum Hand Pump with vernier variator
Pressure Vacuum Variator (lab use)
Connector Kit – includes fittings, tees, tubing
and reducers to fit up to most
pressure instruments
One valve, push to read equalizing manifold
for differential models only
A900016-50001
A34957
961P
961V
971A3
A34386
A900020-90772
Portable Digital Manometer
Standard Features on the Portable Digital Manometer
• Display: 4-1/2 digit LCD with 0.4-inch high digit.
LOW BATTERY indication.
• Pressure Connections: 1/8 inch FNPT (adapters
available).
• NIST traceability: NIST certificate supplied as an
option for all models.
• Pressure Limits: Not to exceed 3 times full scale or
125 psi whichever is less.
• Power: Field replaceable 9 volt. Over 100 hours
continuous use at 20˚C (68˚F) with recommended
alkaline battery.
• Media compatibility: Non-isolated sensor for clean,
dry, non-corrosive gases.
• Power: 9-volt alkaline battery, 9 volt Lithium battery
is recommended for use below 32˚F (0˚C)
• Temperature:
Operating: 0˚ to 40˚ C (32˚ to 104˚F)
Storage: -40˚ to 140˚ C (-40˚to 140˚F)
±0.01% FS per degree C (Absolute: ± 0.030% FS
per degree C)
• Enclosure: 8 ounce (6.5” X 3.2” X 1.2”) impact
resistant ABS plastic case and soil resistant polycarbonate labeling.
• Zero Function: Easy to use front panel zero
adjustment knob.
• Accuracy: ± 0.25% of reading ± 5 digits @ 22˚C
(includes the combined effects of linearity,
repeatability, and hysteresis)
Portable Digital Manometer
Ordering Information
MODEL
Range
Units
Resolution
D0020IW
D0200IW
D1000IW
D00l0P
D0030P
D0l00P
D0050MB
D0500MB
D2000MB
D0007B
A0030P
A1500MH
A0060IH
0-20
0-200
0-1000
0-10
0-30
0-100
0-50
0-500
0-2000
0-7
0-30
0-1500
0-60
in H2O
in H2O
in H2O
psi
psi
psi
mbar
mbar
mbar
bar
psia
mm Hg A
in Hg A
0.01
0.01
0.1
0.001
0.01
0.01
0.1
0.1
0.1
0.001
0.01
0.1
0.01
H2O and Hg ranges are supplied referenced to 20˚ C (68˚ F) and 0˚ C (32˚ F) respectively.
9
2100 Series Smart Gauge
Meriam Instrument’s 2100 Smart Gauges are microprocessor based pressure sensing devices that can
be used to measure pressure, differential pressure
(air or gas flow), or hydrostatic level. There are
three models in the series: the 2110P is principally
for pressure measurements, the 2110L is for level
measure and the 2110F is for gas flow measurement.
These three units share the same hardware, but have
different software programs based on the function.
Manometer Replacement
2100 Smart Gauges can replace Manometers when
restrictions on indicating fluids are a problem. Two
applications are significant. One application is
hydrostatic level measurements using bubblers.
The 2100 series is a good replacement because it
maintains local indication, adds outputs and utilizes most of the existing system of bubblers and
other components. Gauge (GI) models may be
directly connected to non-pressurized tanks for
direct head measurements. The other application
is gas or air flow metering. Examples are heat
treating, aeration, purge and cooling. The 2100 Smart Gauges maintain local indication, add outputs and keep
replacement costs down. With external corrections for pressure and temperature, the gauges can also measure
mass flow.
Pressure Switch In this application the 2100 has two distinct advantages over mechanical gauges. First, the
actual switching point can be precisely set. A user can "see" the set point without having to make trial and
error adjustments. Second, it reduces excessive dead band or hysteresis – a common complaint about mechanical
gauges. The dead band in the 2100 is user selectable for exact control.
Absolute / Vacuum Measurement Absolute models give resolution to 0.1 mm Hg. Vacuum units have 0.001"
Hg resolution over the entire vacuum range. The combination of resolution, 0.05% of full scale accuracy, outputs and low price make the 2100 a good choice for customers in research and development laboratories and
process measurement.
Standard Features on the 2100 Series Smart Gauge Family
• Approvals: CSA Intrinsically Safe on battery models.
CE mark available on battery and 4-20 mA units.
• NIST Traceable: NIST certificate supplied with all
models.
• Media compatibility: Non-isolated Differential sensor
(DN) for clean, dry, non-corrosive gases. Isolated
Gauge and Absolute sensor (GI and AI) for fluids
compatible with 316ss.
• Process connection: 1/8" female NPT, 3l6ss
• Enclosure: 4 lbs, 1/4" DIN (3.8" x 3.8" x 6.5")
aluminum enclosure with epoxy finish. Standard unit
is NEMA 4X on front panel only. Battery and 4-20 mA
units are NEMA 4X throughout.
• Backlight
• Damping: selectable from 0.1 to 50 seconds.
• Adjustable Deadband: on SPDT relays
• Selectable Timeout: conserves battery
• Lockout: prevents inadvertent resetting of gauge
configuration.
10
• Temperature:
Storage: -40˚F to 140˚F (-40 to 60˚C)
Operating: 23˚F to 122˚F (-5 to 50˚C)
• Pressure Limits: Twice range on Gauge and Absolute
(GI and AI) units. Twice range on Differential (DN)
units when pressurized on high side only 20x on 20"
sensors when pressurized on high side only and 150
PSI (10.5 Kg/cm2) static when applied to both sides
of the sensor simultaneously.
• Display: 4 1/2 digit LCD, 0.6" high (15.24mm)
• Power/Outputs: Standard unit has selectable 110
VAC 50/60 Hz, 220 VAC 50/60 Hz, or 12 to 28 VDC
power. Included are an RS-232C and two set point
relays rated 1 amp resistive @24 VDC, .5 amp resistive @ 115 VAC. Options: Lithium battery unit with
field replaceable battery board and user defined auto
shut-off. 12 to 28 VDC power for 4-20 mA and RS-232
output or 1-5 VDC and RS-232.
• Accuracy: ±0.05% of Full Scale( ±0.1% FS on 20"
H2O Sensor). This includes the combined effects of
linearity, repeatability, hysteresis and temperature
2100 Series Smart Gauge
Model 2110P for DP, P gauge, P absolute, Vacuum
Meriam Instrument’s 21l0P Smart Gauge is a microprocessor based, programmable, pressure sensing device.
The ranges available allow for measurement of pressure, differential pressure, vacuum and absolute pressure.
All units are programmed to allow easy configuration of the gauge through the front keypad. The AC powered
and 4 to 20 mA units can also be configured through the RS-232C serial communications port.
The SPDT relays on the AC powered models are an ideal choice for process control functions. The 4 to 20 mA
outputs on the 24 Vdc model allows the 2110P to be used in both control and recording applications. Both
models also have RS-232C communications for high level control and data logging capabilities. Typical applications include use as a test bench gauge, tank level measurement, gas flow measurement and leak testing.
• Selection of engineering units: mm Hg, PSI, in. Hg,
mbar, Bar, kPa, in. H2O (20ºC, 40ºC, 60ºF), Kg/cm2, cm.
H2O and user defined.
• Range: 20" H2O differential to 2000 PSIG
2000 mm HG Absolute
Ordering Information 2110P Smart Pressure Gauge
Sensor Type:
DN0020
DN0200
DN2000
GI0020
GI0200
GI2000
AI2000
0-20"H2O
0-200" H2O
0-2000" H2O
0-20 PSI
0-200 PSI
0-2000 PSI
0-2000 mm Hg
Mounting options:
01 Panel Mount (standard)
02 2" Pipe Mount
03 Portable Handle / Bench Stand
Power/Output options
1 110/220 VAC, 24
VDC/RS-232C,and
SPDT Relays (Standard)
2 Batteries / No Outputs
3 24 VDC /4-20 mA, RS-232C
4 Batteries w/I.S. approval
5 Batteries w/CE approval
6 Code 3 w/CE approval
7 24 VDC/ 1-5 VDC, RS-232C,
CE approval
Example: 2110P with 200" H2O Differential pipe mount and Battery Pack 2110P DN0200 02 2
Model 2110L for Bubbler or Head Type Tank Level Measurement
Meriam Instrument’s 2110L Smart Gauge is a microprocessor
based, programmable, pressure sensing device. It is designed to
display tank level in volumetric or mass units based on the
hydrostatic head pressure of the fluid in the tank. The 2110L
can be used in bubbler systems or for direct head measurement on pressurized or vented tanks. It can be configured for
linear tanks such as vertical cylinders or for use on non-linear
tanks such as horizontal cylinders and spheres. All units are
programmed to allow easy configuration of the gauge
through the front keypad. The AC powered and 4 to 20 mA
units can also be configured through the RS-232C serial
communications port.
SPDT relays on AC powered units and the 4 to 20 mA
output on the transmitter models make the 2110L an ideal
choice for many level control and recording functions. Both
models also have RS-232C communications for additional control
and data logging capabilities. The SPDT relays have selectable deadbands
to prevent wear on pumps due to constant cycling.
• Selection Of Engineering Units: gallons, pounds,
cubic feet, liters, percent, kilograms, cubic meters, in.
H2O and user defined.
• Range:
DN: Differential Non-isolated 20", 200", 2000" H2O
GI: Gauge Isolated 20 PSIG
11
2100 Series Smart Gauge
Ordering Information 2110L Smart Level Gauge
Sensor Type:
DN0020
DN0200
DN2000
GI0020
0-20"H2O
0-200" H2O
0-2000" H2O
0-20 PSI
Mounting options:
01 Panel Mount (standard)
02 2" Pipe Mount
03 Portable Handle / Bench Stand
Power/Output options
1 110/220 VAC, 24
VDC/RS-232C,and
SPDT Relays (Standard)
2 Batteries / No Outputs
3 24 VDC /4-20 mA, RS-232C
4 Batteries w/I.S. approval
5 Batteries w/CE approval
6 Code 3 w/CE approval
7 24 VDC/ 1-5 VDC, RS-232C,
CE approval
Example: 2110L with 200" H2O Differential pipe mount and 4 to 20 output 2110L DN0200 01 3
Model 2110F for Flow Indication of DP Primary Elements
Meriam Instrument’s 2110F Smart Gauge is a microprocessor
based, programmable, differential pressure sensing device
designed to display flow rate when used with a head loss
type flow element such as Accutube® averaging pitot tubes,
orifice plates or Meriam Instrument’s laminar flow elements.
The piezoresistive differential pressure sensors are available
in three ranges assuring the best accuracy and resolution
for an application. The unit calculates flow rate by measuring the DP and using it in algorithms with flow coefficients
entered into the unit by the user. All units can be configured
through the front keypad. The AC powered and 4 to 20 mA
units can also be configured through the RS-232C serial
communications port.
SPDT relays on AC powered units and the 4 to 20 mA output on the transmitter models make the 2110F an
ideal choice for many control and recording functions. Both models also have RS-232C communications for
additional control and data logging capabilities. Typical applications include use as a LFE test bench gauge,
air compressor usage monitoring and leak testing.
• Engineering Units: Pounds, cubic feet, liters,
percent, kilograms, cubic meters, in. H2O and
user defined units. Minutes or hours time
constant can also be displayed
Sensor Type:
DN0020
DN0200
DN2000
0-20"H2O
0-200" H2O
0-2000" H2O
• Range:
DN: Different Non-isolated 20", 200", 2000" H2O
Mounting options:
01 Panel Mount (standard)
02 2" Pipe Mount
03 Portable Handle / Bench Stand
Power/Output options
1 110/220 VAC, 24
VDC/RS-232C,and
SPDT Relays (Standard)
2 Batteries / No Outputs
3 24 VDC /4-20 mA, RS-232C
4 Batteries w/I.S. approval
5 Batteries w/CE approval
6 Code 3 w/CE approval
7 24 VDC/ 1-5 VDC, RS-232C,
CE approval
Example: 2110F with 20" H2O Differential Panel mount and 4 to 20 output 2110F DN0020 01 3
12
3800 Digital Pressure Gauge
The MINIGAUGE from Meriam Instrument provides digital pressure measurement
at an economical price. Pressure ranges are available from vacuum to 10,000 PSIG
at an accuracy of ± 1 % of Full Scale. One 9-volt alkaline or lithium battery
powers the transducer and the LCD display. The display is a 4.5 digit LCD with
0.4" high numerals. Pressing the "Push To Read" key turns the display on for a
fixed viewing time. Automatic shut-off after the viewing period conserves battery
power. Field calibration is easy to accomplish by adjusting zero and span
potentiometers located under the back cover plate.
The rugged ABS plastic indicator housing is 2.75 inches in diameter. Wetted components are 17-4 PH stainless steel for compatibility with many process liquids and gases.
Process connection is via a 1/4" MNPT stainless steel stem. Typical applications are test and measurement
in the process industries, hydraulics, pneumatics, industrial gases and on OEM equipment.
• Accuracy: ± 1% of Full Scale at calibrated temperature. Temperature effect: ± 0.1% per °F.
• Display: 4.5 digit LCD (0.4" character height), Low
battery indicator.
• Power: One 9 volt alkaline battery included, automatic timeout to conserve battery life.
• Enclosure: Custom molded ABS plastic housing.
• Engineering Units: Available in either PSIG,
Bar or kg/cm2. Specify when ordering.
• Over-Pressure Limits: Twice the full scale range
• Weight: 7 ounces
• Certifications: NIST Certificate optional. CE and
Intrinsically Safe/CSA pending
• Field Calibration:
Zero and span adjustment potentiometers are
accessible from the backside of the case.
Dimensions
• Media Compatibility: Isolated sensor for liquids or
gases compatible with 17-4 PH stainless steel.
• Process Connection: 1/4" male NPT
• Temperature:
Storage: -4º F to 140º F (-20º C to 60º C)
Operating: 32º F to 122º F (0º C to 50º C)
3800 MINIGAUGE Models & Ranges
Model:
3800-GI0050PSI
3800-GI0100PSI
3800-GI0500PSI
3800-GI1000PSI
3800-GI1500PSI
3800-GI3000PSI
3800-GI6000PSI
3800-GI10000PSI
3800-GI00003BAR
3800-GI00007BAR
3800-GI00035BAR
3800-GI00070BAR
3800-GI00105BAR
3800-GI00210BAR
3800-GI00410BAR
3800-GI00720BAR
3800-GI00003KG
3800-GI00007KG
3800-GI00035KG
3800-GI00070KG
3800-GI00105KG
3800-GI00210KG
3800-GI00420KG
3800-GI00730KG
Pressure Ranges
& Resolution
50.00 PSIG
100.00 PSIG
500.0 PSIG
1000.0 PSIG
1500.0 PSIG
3000 PSIG
6000 PSIG
10000 PSIG
3.500 Bars
7.000 Bars
35.00 Bars
70.00 Bars
105.00 Bars
210.0 Bars
410.0 Bars
720.0 Bars
3.500 kg/cm2
7.000 kg/cm2
35.00 kg/cm2
70.00 kg/cm2
105.00 kg/cm2
210.0 kg/cm2
420.0 kg/cm2
730.0 kg/cm2
13
3900 /3910 Digital Pressure Gauge
The MERIGAUGE digital pressure gauge from Meriam Instrument successfully addresses the modern demands
of process pressure measurement. Pressure ranges are available to 6,000 PSIG at standard accuracy of ± 0.25%
of Full Scale and optional accuracy of ± 0.10% of full scale. A combination gauge that can be used for positive
pressure measurements and vacuum measurements is also available. The standard gauge is powered by two 9
volt alkaline or lithium batteries. Externally powered units are available. The pressure display is a 4 1⁄2" digit
LCD with 0.6" high numerals. Each gauge includes 12 field selectable engineering units. The selectable units
include PSIG, feet of water, inches of water, inches of the mercury, Bar, millimeters of mercury, kilopascals and
user configurable units. In addition to numeric pressure indication, visual indication of the pressure is represented by an adjustable vertical bar graph on the left side of the display. Other standard features include
Min/Max query, Zeroing, selectable Damping, selectable program Lock-out, adjustable display shutoff and field
recalibration and adjustable display shutoff (for battery powered models). The housing is 304 stainless steel and
NEMA 4 rated. Wetted components are 316 stainless steel for compatibility with many process fluids. Process
connection is via a 1⁄4" MNPT 316 stainless steel stem.
Typical applications are instrumentation and control in the process industries, hydraulics, pneumatics,
industrial gases and OEM’s. Options such as panel mounting, 24 Vdc powered units, 4 to 20 mA output,
adjustable SPDT relay outputs, and various style diaphragm seals add to the versatility of the MERIGAUGE.
3900/3910 MERIGAUGE Ordering Information
±0.25% FS Models
3900-GI0010-XX-Y-ZZ
3900-GI0050
"
3900-GI0100
"
3900-GI0500
"
3900-GI1000
"
3900-GI1500
"
3900-GI3000
"
3900-GI5000
"
3900-GI6000
"
3900-VI0050
"
Pressure Ranges
0 - 10 PSIG
0 - 50 PSIG
0 - 100 PSIG
0 - 500 PSIG
0 - 1000 PSIG
0 - 1500 PSIG
0 - 3000 PSIG
0 - 5000 PSIG
0 - 6000 PSIG
Vacuum - 0 - 50 PSIG
±0.10% FS Models
3910-Same pressure ranges and options as 3900
14
XX=
Y=
ZZ=
Options
01: Pipe Mount (battery power)
02: Pipe Mount (external power)
03: Panel Mount (battery power)
4: Panel Mount (external power)
1: Battery Power
2: 24VDC Power (2 wire)
3: 4-20mA output (2 wire)
4: 24VDC, 4-20mA (4 wire)
5: 24VDC, 2 relay outputs
6: 24VDC, 2 relays, 4-20mA
7: 24VDC, 1-5 VDC (4 wire) output
8: 24VDC, 2 relays, 1-5 VDC
01: CE Approval
02: CSA/Intrinsically Safe Approval
3900 /3910 Digital Pressure Gauge
Specifications
• ACCURACY:
3900: ± 0.25% of Full Scale at calibrated temperature.
3910: ± 0.10% of Full Scale at calibrated temperature. Temperature Effect: All units compensated to
± 0.01% of F.S. per ˚C.
• ENCLOSURE: NEMA 4, 304 stainless steel
• MEDIA COMPATIBILITY:
Isolated sensor for processes compatible with 316SS
• PROCESS CONNECTION: 1⁄4" male NPT, 316SS
• DISPLAY: 4 1⁄2 digit LCD (0.6" high), 0 - 100%
vertical bar graph, Unit Indication, Low battery
indicator.
• OVER-PRESSURE LIMITS:
Twice the full scale range
• POWER:
Options: •Two 9 volt alkaline batteries (included).
• Lithium batteries for use below 32ºF (0ºC)
• 24VDC or 110 VAC with optional adaptor.
• WEIGHT: 25 ounces.
• TEMPERATURE:
Storage: -40º F to 158º F (-40º C to 70º C)
Operating: 32º F to 140º F (0º C to 60º C)
Standard Features
• MIN/MAX: Capture and display pressure extremes.
• SELECTION OF ENGINEERING UNITS:
PSIG, Ft. H2O, In. H2O (60º F, 20º C, 4º C), In.
Hg, Bar, mm Hg, kPa, & user selectable units
• DAMPING: Provides a stable pressure indication
by averaging pressure measurements. Selectable
from off to 50 seconds.
• FIELD RECALIBRATION:
Recalibration can be done at any time using an
accurate standard pressure reference.
• SHUTOFF TIMER: (available on battery powered
units) Selectable from off to 50 minutes.
• BARLo & BARHi: A user scalable Bar Graph for
visual indication of any pressure range. Default is
0 to100% of full scale range.
Options
• 24 VDC POWERED UNITS:
External powered units for extended gauge
operation and for gauges with output options.
Compliance voltage: 17 VDC to 30 VDC.
• Intrinsically Safe (CSA) and CE APPROVAL:
Intrinsically Safe/CSA approval for use in Class 1,
Division 1, Groups A,B,C,D environments (battery
units only, others pending). CE approval for use in
the European markets.
• 4 to 20 mA or 1-5 VDC OUTPUT:
Provides remote pressure monitoring. Fully
adjustable throughout the gauge full scale range.
Two wire configuration with a 6 foot pigtail and
four wire configuration available for 4-20 mA.
Four wire configuration for 1-5 VDC.
PIPE MOUNT
• SPDT RELAY OUTPUTS:
Provides two adjustable SPDT relays that
can be integrated in a control circuit to activate an
external device such as a warning light, valve,
solenoid, etc... Adjustable throughout the gauge
full scale pressure range with adjustable deadband.
Relay contacts are rated for 0.5 Amp @120 VAC
and 1 Amp resistive @ 30 VDC.
• PANEL MOUNTING: Provides integral panel
mounting bracket with rear pressure connection.
• DIAPHRAGM SEALS: Various sizes and styles of
diaphragm seals including threaded, flanged and
sanitary provide gauge to process isolation.
Sanitary diaphragm seals are available for food
and pharmaceutical applications.
Dimensions
PANEL MOUNT
15
Model 1500 Digital Transmitter
Meriam’s 1500 Digital Transmitters are for high accuracy
applications for OEM’s, on manufactured skids, in process control
systems and plant instrumentation. RS-485 communications
allows for easy configuration using a PC or laptop computer.
The RS-485 addressable interface allows up to 32 devices to be
networked together. Optional 1-5 Volt or 4 - 20 mA outputs are
also configured from a PC or laptop.
• ± 0.025% of URL (Upper Range Limit).
• Absolute, gauge and differential pressure sensors.
• 316SS isolated sensors for wet/corrosive process.
• Cost saving, non-isolated sensors for gas service.
• No temperature effect on RS-485 output from 23° to 122° F.
Standard Features on the 1500 Digital Transmitter
• Damping rates: User selectable from 0.1 to 25
•
•
•
•
seconds
NIST Traceability: NIST certificate supplied with
all models.
Temperature Range:
Storage: -40˚F to 140˚F (-40˚C to 60˚C)
Operating: 23˚F to 122˚F (-5˚C to 50˚C)
Process Connections:
Pressure:
1/8" female NPT, 316ss
Electrical:
DB-9
Media compatibility: Non-isolated Differential
sensor (DN) for clean, dry, non-corrosive gases.
Isolated Gauge and Absolute sensor (GI and AI)
for fluids compatible with 316ss.
16
• Pressure limits: Twice range on Gauge and
•
•
•
•
Absolute (GI and AI) units. Twice range on
Differential (DN) units when pressurized on high
side only and 150 PSI (10.5 Kg/cm2) static when
applied to both sides of the sensor simultaneously.
Engineering units: cm H2O, in H2O (at 39.2, 60
and 68˚F), mBar, Bar, mm Hg, in Hg at 0˚C, PSI,
kPa, Kg/cm2 and user scaled.
Enclosure: 2" x 4" x 4" NEMA 12 Aluminum
Housing
Mounting: Standard transmitter secures by
pressure connections. Optional mountings are
DIN rail clip or surface/wall mount flange.
Weight: DN units are 1 lb.
GI & AI units are 2 lb.
Model 1500 Digital Transmitter
1500 Digital Transmitter Output Specifications
• Output Accuracy:
RS-485
4 - 20 mA
± 0.025 % of URL (±0.1% 20" sensor)
± 0.05% of URL. ± 0.125% on 20" sensor
± 0.125% span @ 4:1 turndown of URL
1 - 5 VDC
± 0.05% of URL ± 0.125% on 20" sensor
(or 0 - 5V) ± 0.125% span @ 4:1 turndown of URL
• Output Temperature Effect:
Digital Output: No temperature effect from -5° C
to 50° C
Analog Output: ± .005% of span /° C
• Long Term Stability: ± 0.1% URL per year
• Output Options:
RS-485 (standard): Half Duplex, 3 wire- TR-1,
TR-0, and Signal ground. 9600 baud, 1
start bit, 1 stop bit and no parity.
External power of 7 to 32 VDC (40 mA
max). Multi-drop addressing with up to
32 devices maximum per RS-485 segment. RS-485 repeaters for additional
segments.
4-20 mA (optional): 2 wire current loop. 17 to 32
VDC for loop supplied 4-20 mA.
1-5V (or 0 - 5V) (optional) : 4 wire, 17 to 32
VDC powered.
1500 Digital Transmitter
Digital Communications
RS-485 PROGRAMMING:
Pressure zero set
Reset factory zero
Analog output span and offset factor set
Damping factor set
Engineering unit selection
Multi drop address selection
1500 Digital Transmitter Ordering Information
DN0020
0-20" H2O
Differential
DN0200
0-200" H2O
Differential
DN2000
0-2000" H2O
Differential
GI0020
0-20 PSI
Gauge
GI0200
0-200 PSI
Gauge
GI2000
0-2000 PSI
Gauge
AI2000
0-2000 mm Hg
Absolute
AI0900
0-900 mm Hg
Absolute
1500 Transmitter Accessories/Options:
RS-485 interface devices
Process connection adapters
Electrical connection adapters
System setup software
Simultaneous digital communications and
analog outputs
Please Specify the Model Number and Sensor Type.
Example is based on a Model 1500 with a 200" H2O
Differential sensor
1500DN0200
17
Differential Pressure Gauges
The Meriam Bellows D/P line of instruments serves as a
compliment to the Meriam Manometers by offering a
choice when pressure rating, space, process
compatibility and many other specifications are a
factor. The Meriam Bellows D/P units are used by
many instrument manufacturers as the basic
differential pressure sensing devices for indicators,
recorders, transmitters or controllers.
Meriam Series 1120 D/P Indicators
The series 1120 gauges are designed to measure differential
pressures, particularly for flow and liquid level. They are
widely used in industrial process plants, power plants, pollution
control facilities and liquid cryogenic storage tank level. Models 1123, 1124 and
1126 have 3", 4-1/2" and 6" dials respectively. A variety of scales for differential pressure, flow
and level can be supplied. The unit is compact and has 270° pointer movement for greater resolution.
Meriam Series 1220 Indicating Switches
The Series 1220 Differential Pressure Indicating Switches are used for on-off control or alarm. They also
indicate flow, liquid level or other process variables. These units are furnished with one or two SPDT
type switches with actuation set points easily adjustable over most of the range of the instrument. The
calibrated travel of the pointer is 270 degrees, which gives good differential pressure indication and
switch resolution. Dials can be supplied with linear scales for differential pressure, square root scales
for flow, or custom scales for level. The Series 1220 Switches are used extensively in power plants,
compressor stations, and cryogenic applications.
Meriam Series 1226X Explosion-Proof Switches
Meriam’s 1226X Explosion-Proof Indicating Switch is CSA and U.L. listed, meeting N.E.C. requirements
for Class I, Division I, Group B or Group D hazardous environments. The explosion-proof housing is
made from a strong, lightweight aluminum alloy that is both non-rusting and non-sparking. A large glass
window provides full viewing of the 6" indicator. Wall, panel or pipe mounting can be supplied.
Meriam 1126P-2 Portable Indicator
The 1126P-2 is designed for portable applications. Typical examples are periodic measurements of the
pressure drop across filters, balancing of flow rates in heating and cooling systems, and checking of back
flow prevention devices. Meriam’s 1126P-2 consists of an 1126 D/P Indicator with 3-valve manifold and
piping, 2 hoses, and quick disconnects. Each instrument system is assembled as a complete package with
all the accessories mounted in a rugged, lightweight, case. When used as a flow measuring device, the
instrument normally comes with a 0-100% square root scale. With all flow elements designed for the same
differential, multiplying the scale reading by the primary element’s full flow design value gives readings
directly in flow units. Scales in flow units, inches of H20, PSI and metric units are also available.
18
Meriam Bellows D/P Instruments
Quick Selection Chart
MODEL
DIAL SIZE
1123
3"
1124
4-1/2"
1126
6"
1224
4-1/2"
HOUSING
Combinations
END
HOUSINGS
Brass
Steel
316SS
Monel
BELLOWS
Beryllium Copper (30" W.C. Minimum--60 PSID Maximum)
316 Stainless Steel (50" W.C. Minimum--500 PSID Maximum)
Monel (50" W.C. Minimum--60 PSID Maximum)
CENTERPLATE
Brass
Steel or Brass (500 SWP only)
316 SS, Steel or Brass (500 SWP only)
316SS
1226
6"
1226X
6"
STATIC WORKING
PRESSURE
500 or 1000 PSI.
1500, 3000 or 6000 PSI
1500, 3000 or 6000 PSI
1500, 3000 or 6000 PSI
1126P-2
6"
PROCESS
CONNECTIONS
1/4" NPT
1/4" & 1/2" NPT
1/4" & 1/2" NPT
1/4" & 1/2" NPT
MOUNTING FLUSH PANEL using indicator case for mounting.
WALL or 3/4" NPT using universal mounting bracket
PIPE SADDLE or WALL using "H" mounting bracket and 2" U-Bolts.
STANDARD
FEATURES
± 0.75% FS for ranges 50" WC and greater; ± 1.5% FS for ranges less than 50" WC.
Simple zero, span and linearity adjustment (field calibration).
Temperature compensation for varying ambient.
NEMA 4, Die-cast aluminum indicator case.
Built-in pulsation dampening (field adjustable).
270° pointer travel for improved resolution.
Break-resistant acrylic viewing window.
Over-range protection.
OPTIONS
Special scales.
Square Root
Linear Tank
Non Linear
Red set pointer.
Bellows fill fluids.
Shock and vibration modifications.
Personalized I.D. tags.
LOX cleaning.
Diaphragm seals and capillary tubing.
CE approved models.
Valve manifolds and piping.
Shatterproof glass viewing window.
CSA approved 1224 and 1226 models.
Anti-Parallax Mirror dial.
Special process connection sizes and locations.
Stainless steel indicator housings and bezel rings.
Special relays for 1220 series models.
NACE MR-01-75 modification.
Differential Pressure Gauge Ordering Information
General Format:
Model – Range - End Housing - Center Plate – Bellows – Scale - Working Pressure
_ _ _ _- _ _ -_ _ _ _ EH-_ _ _ _ _ CP- _ _ _ _ _B- _ _ _ _ _ - _ _ _ _
Additional Scale Configurations Available Please Consult Factory For Details
Example: Differential Pressure gauge 6" dial, 316 SS wetted parts, 1000 PSI working pressure, 50" DP linear scale
1126 – 50 – 316EH – Brass CP – 316B – Linear –1000
19
1300 Series Mechanical Pressure Gauges
Meriam Instrument’s Series 1300 Bourdon Tube Gauges
are rugged and dependable mechanical pressure indicators.
Several model choices are available to suit a variety of
application environment. From heavy duty glycerine filled
pressure gauges to general process and field-repairable
stainless steel gauges, Meriam has the gauge you need.
Dial sizes are 2 1⁄2", 4" and 4 1⁄2". Pressure ranges are available from 30" of Mercury vacuum up to 30,000 PSIG with
short term over-pressure limits up to 1.3 times the full
scale value. Mounting options include lower mount stem,
center back mount and lower back mount for direct
mounting to the process piping. Flush front and panel
mount kits are also available.
Model 132334 Bourdon Tube
Process Pressure Gauges
These industrial type 4 1⁄2" process gauges are suitable
for corrosive environments where the fluid medium is
compatible with 316SS and not prone to clotting. The
indicator case is available with optional liquid fill for
severe vibration service. Solid front, blow-out back
meets safety requirements of ASME B40.1. Lower
mount stem and lower back stem process connection
are available in 1⁄4" or 1⁄2" MNPT. Optional panel
mounting kit is also available.
Accuracy: +0.5% of FS (ASME B 40.1 Gr 2A)
Ranges: Vacuum / Compound -30" HG / 0 / 200 PSI
Pressure from 15 PSI to 30,000 PSI
Working Pressure Range:
Stable working pressure:
0.75 x full scale value
Pulsating pressure:
0.90 x full scale value
Short time over-pressure:
1.30 x full scale value
Operating Temperature: -40º to 140ºF (-40º to 60ºC)
Media: -40º to 212ºF (-40º to 100ºC)
Case: Black reinforced thermoplastic, rear flange lugs
132354 Bourdon Tube Stainless Steel Pressure
Gauges - Field Repairable
These gauges are suitable for most process medias
that are compatible with 316 St. Stl. wetted parts and
are not prone to clogging the gauge's pressure system.
St. Stl. case can be ordered liquid filled to dampen the
pointer and lubricate movement. Bayonet-type bezel
ring allows easy access to gauge movement for re-calibration or pointer adjustment. 2 1⁄2" & 4" dial sizes. 1⁄4"
or 1⁄2" MNPT connections.
20
Accuracy: 2 1⁄2": + 1.5% of span, 4": + 1.0% of span
Ranges: Vacuum / Compound to -30"HG / 0 / 200 PSI
Pressure from 15 PSI to 15,000 PSI
Working Pressure Range:
Stable working pressure:
0.75 x full scale value
Pulsating pressure:
0.90 x full scale value
Short time over-pressure:
1.30 x full scale value
Operating Temperature: -40º to 140ºF (-40º to 60ºC)
Media: -40º to 212ºF (-40º to 100ºC)
Case: 304 stainless steel with vent plug and stainless
steel bayonet ring.EPDM o-ring between case and
connection (4"); Welded case / socket connection (2 1⁄2")
132140 Bourdon Tube Pressure Gauges -Forged Brass
Case with Copper Alloy Wetted Parts
Heavy-duty, glycerine filled pressure instrument for
stability and long service life. Offers superior service
where pulsation or vibration exists. Compatible with
all medias that do not clog connection port or corrode
copper alloy. 2 1⁄2" and 4" dial sizes. 1⁄4" or 1⁄2" MNPT
connections.
Accuracy: 21⁄2": + 1.5% of span, 4" + 1.0% of span
Ranges: Vacuum / Compound to -30"HG / 0 / 200 PSI
Pressure from 10 PSI to 10,000 PSI
Working Pressure Range:
Stable working pressure:
0.75 x full scale value
Pulsating pressure:
0.67 x full scale value
Short time over-pressure:
1.00 x full scale value
for 4" size, 1.30 x full scale value for 21⁄2" size
Operating Temperature: -4º to 140ºF (-20º to 60ºC)
Media: 140ºF (+60ºC) max. – soldered tube
212ºF (+100ºC) max. – brazed tube
Accessories
Pressure / Vacuum Variator
This can produce -10 PSIG to 30 PSIG (-.69 to 2.0
Bar) or 12 to 20" Hg (300 to 500mm Hg) vacuum.
Max. Pressure is 20 PSIG (1.3 Bar) when used with
other pressure sources. A table stand is available for
bench top usage. Connections are 1/4" FNPT.
Hand Pumps
These are available in 2 models, Pressure or
Vacuum. The pressure pump generates a positive
pressure up to 145 PSIG, while the vacuum pump
generates a vacuum of 650mm Hg. Both units feature
a needle bleed valve and a multi-turn vernier, which
provides precise adjustment. Connections are
1/8" FNPT.
Line Traps
Line Traps are an inexpensive means to keep
manometers and indicating fluids clean and are
recommended for all installations. When installed in the
line ahead of the manometer they permit entrained
solids to settle out before they reach the manometer.
When used with gases or vapors they trap moisture.
Sight Feed Bubblers
Bubblers provide a visual indication of flow by
showing air or gas bubbles discharging from a dip
tube immersed in a liquid in a transparent bowl. The
bubble rate is controlled by a stainless steel needle
valve in the head casting.
Bubblers and Line Traps available with heavy wall
transparent bowls made of either plastic or glass.
They are rated at 100 PSI and 50 PSI respectively.
Either a ring type or strap type configuration is available for securing the bowl to the head.
Float Check Valve
This is a most valuable accessory small enough to
be installed on each tube of a multiple tube manometer,
yet fully dependable. Normal operation of the
manometer is not impaired by vertical installation of
the float check valve. If pressure increases beyond the
instrument range the valve closes preventing the fluid
from leaving the manometer. The valve opens when
normal pressure is restored. Maximum operating
pressure is 500 PSIG.
Return Wells
These are stainless steel and for use on manometers
with operating pressures up to 500 PSIG. The indicating fluid is trapped during Manometer over pressure.
Fluid will drain back into the Manometer when normal pressure is returned.
Seal Pots
Meriam Seal Pots are used to provide a constant
liquid head on each side of a flow meter involving
steam or other condensable vapors. They also isolate
the instrument from the process with a sealing liquid.
All Meriam Seal Pots are fabricated from grade A
seamless steel pipe. Each unit is cold hydraulic tested
to over twice its rated working pressure. All connections are 1/2" NPT furnished with solid steel plugs.
The finish is red oxide primer.
21
Manometer
Meriam Manometers have many advantages in this age of technology
because of their inherent accuracy and simplicity. Manometers are unique in
being both pressure measurement instruments and standards for calibration of
other instruments. Once considered solely a laboratory instrument, the
manometer is today commonly used in production applications to measure
pressures ranging from as high as 100 inches of mercury to the lowest vacuums
of space.
U-Tube Manometer
The U-tube manometer is the basic and most widely used style of manometer.
The Meriam U-tube manometer is a versatile, economical instrument for the
measurement of pressures, vacuums or differential pressures.
Pressure measurements are accomplished by balancing a vertical head of
indicating fluid with the pressure to be measured. There are no cams, gears,
or levers to operate in the manometer. This allows the U-tube manometer to be
recognized by NIST as a primary standard due to its inherent accuracy and
simplicity of operation.
Meriam U-tube manometers are constructed of a ridged cast aluminum frame,
aluminum indicating scale and hand bent glass U-tube. Mounting holes are
provided in the frame for mounting to a wall, column or other suitable structure.
Well Type Manometer
Well manometers are a direct reading device
designed for process monitoring, general purpose
production testing or laboratory measurement. Designed
for a maximum line pressure of 250 PSI (500 PSI optional) these instruments
may also be used for tank level, flow measurement and leak detection. Well
manometers are constructed of aluminum channel, stainless steel end
blocks and stainless steel manometer well. The 7/16" diameter glass tubing
is yoke packed with viton gaskets at each end block and is supported at
spaced intervals to prevent distortion.
In most cases, the uncertainty of a manometer reading is + 1/2 of the
smallest scale graduation. This is due to the human eye’s ability to
interpolate between graduations
Inclined Manometer
Inclined manometers provide greater readability by stretching a
vertical differential along an inclined indicating column, giving more
graduations per unit of vertical height. This effectively increases the
instrument’s sensitivity and accuracy. Scales are typically graduated
to the hundredth of an inch.
The Model 40HEX Inclined manometer is individually calibrated
and the angle of inclination is set relative to the instrument level
mounted above the channel. The unit is also capable of operating
with 350-PSI line pressure. The construction of the 40HEX35 is similar
to the well type manometer described above.
Additional inclined manometers are available depending on your
requirements. Please review the manometer chart on the facing page or
contact the factory for assistance.
22
Meriam Manometers
Quick Selection Chart
Manometers: “U” Tubes & Well Types & Inclines
(In Inches)
WETTED
PARTS
PRESSURE
RATING
MOUNTING
STYLES
"U" TUBE
10AA25
6, 10, 15, 20,
30, 50"
Cast Iron
316 SS PVC
250 PSIG
Wall
Table
"U" TUBE Hg
FILLED
ABSOLUTE
11AA10
5, 10, 19, 29,
50"
Cast Iron
316 SS
100 PSIG
Wall
Table
HI PRESSURE
"U" TUBE
20DAX40
10,20,30,40,
60, 80, 100"
303 SS
400 PSIG
Wall
Table
GENERAL
PURPOSE
30EBX25
30EBX50
6, 12, 20, 30,
35, 40, 50, 60,
80, 100"
303 SS
250 PSIG
500 PSIG
Wall, Table
Flush Front
Pipe
PRECISION
VERNIER
30EFX25
20, 30, 40, 50,
60"
303 SS
250 PSIG
Wall, Table
Flush Front
Pipe
Hg FILLED
ABSOLUTE
310ECX10
310EFX10
6, 12, 20, 30,
35, 40, 50, 60,
80, 100"
303 SS
100 PSIG
Wall, Table
Flush Front
MULTIPLE
TUBE
33KBX35
12, 20, 30, 40,
50, 60, 80, 100"
303 SS
350 PSIG
Wall, Table
Flush Front
MICRO
PRECISION
34FB2TM
34MB2TM
10, 20"
Stainless Steel
20 PSIG
Table
ACRYLIC
INCLINED
40AM10
40AX10
1, 2, 3, 6"
25, 50, 75, 150mm
Acrylic
100 PSIG
Wall
Table
GENERAL
PURPOSE
INCLINED
40HEX35
2, 4, 6, 8, 10,
12, 14, 16, 18,
20"
Stainless Steel
350 PSIG
Wall
DRAFT
GAUGE
INCLINED
40GD10
1/2, 1, 1-1/2,
2, 3, 4
Aluminum
100 PSIG
Wall
MODEL
RANGES
*CONSULT FACTORY FOR OTHER AVAILABLE MODELS AND FLUIDS
23
Laminar Flow Element
Laminar Flow Element
Meriam Laminar Flow Elements are
gas volume rate of flow differential
producers operating on capillary flow
principles. They are available in a wide
range of types and sizes and are ideally
suited to many flow measurement and
calibration applications.
Some typical applications of Meriam LFE Elements
include: combustion airflow to internal combustion engines, fan
and blower calibration, leak testing, and testing of automobile components.
LFE’s are used to calibrate other flow metering devices such as variable area meter,
thermal anemometers, orifices, nozzles, etc. Contact us for application assistance.
Calibration and Accuracy
Meriam LFE elements are calibrated with air at atmospheric conditions, and referenced to 29.92" mercury absolute
(760MM HG Abs.) and 70˚F. (21.1˚C). Each completed element is calibrated and correlated to Meriam flow standards,
which are traceable to the National Institute of Standards and Technology. The Meriam LFE element is supplied with
a reproducible flow curve in terms of SCFM versus differential pressure in inches of water. Correction factors are
included to cover an inlet pressure range from 26 to 36 inches of mercury absolute and an inlet temperature from
50˚F to 150˚F. For special flow applications, we request you contact Meriam, giving complete flow information. The
rated accuracy* of all Meriam LFE elements is of actual reading and is not the much wider tolerance of other devices
which are based on percentage of maximum flow rate.
*Accuracy Levels Available:
Commercial Calibration
Master Calibration
Independent Lab Calibration
+0.86% of Actual Reading
+0.70% of Actual Reading
+0.50% of Actual Reading
Special calibration procedure service is available for those Meriam LFE units, which are governed by quality programs
requiring periodic recalibration. The Special Calibration Procedure #A-33544 is designed to meet the basic requirements of MIL-STD-45662A, ANSI Z540, 10CFR50 and MIL-Q-9858A. Contact Meriam direct for information.
Meriam LFE Elements are normally rated for maximum flow at 4 or 8 inches of water differential. There is no recovery
of pressure differential in a Laminar Flow Element matrix. Filters, inlet and outlet configurations increase the total
pressure drop and must be considered when pressure loss considerations are critical.
GAS PROPERTIES AT STANDARD CONDITIONS OF 29.92" Hg. Abs. and 70˚F
Gas
Air
Argon
Helium
Hydrogen
Nitrogen
Oxygen
Carbon Dioxide
Density (lb/ft3)
0.0749
0.1034
0.0103
0.0052
0.0725
0.0828
0.1143
NOTE: Ref. American Institute of Chemical Engineers
24
µViscosity Micropoises
181.87
222.45
196.90
88.41
175.72
201.91
147.84
Specific Gravity
1.000
1.380
0.138
0.0695
0.968
1.105
1.526
LFE Sizing Worksheet
Date:
Customer Name:
POC:
Address:
Phone:
City, State, Zip:
Fax:
Customer No. :
MERIAM No. :
Service Description:
Tag or ID No. :
GAS:
(AIR)
(ARGON)
(NITROGEN)
(CARBON DIOXIDE)
(HELIUM)
(HYDROGEN)
(OXYGEN)
STANDARD CONDITIONS:
DEG
(70 DEG F)
(29.92" HG ABS.)
TEMPERATURE AT FLOW:
DEG (F) (C) (R) (K)
FLOWING PRESSURE UNITS:
(“Hg @ 0 DEG C) (mm Hg @ 0 DEG C) (“ H2O @ 4 DEG C)
(mm H2O @ 4 DEG C) (cm H2O @ 4 DEG C) (PSI)
(Kg/m2) (Bar) (MILLIBAR) (PASCALS)
FLOW: (MASS)
(VOLUME)
(POUNDS)
(KILOGRAMS)
(SECONDS)
(MINUTE)
(ACTUAL)
(STANDARD)
(HOUR)
(CUBIC CENTIMETER) (CUBIC FOOT) (CUBIC METER) (LITER)
(SECONDS)
(MINUTE)
(HOUR)
SPECIFIC GRAVITY:
(MOLECULAR WT. OF FLOWING GAS / 28.95)
VISCOSITY:
(MP)
(CP)
(LB. SEC/FT2)
(LB/(FT•S))
(PASCAL SEC)
DENSITY
(LB/FT3)
(Kg/CM3)
(Kg/M3)
(g/CM3)
25
Meriam LFE Quick Selection Chart
MODEL
MODEL NUMBER & DESCRIPTION
NOMINAL AIR FLOW RANGE
STANDARD CUBIC FEET/MINUTE
(29.92" Hg. Abs. & 70˚F) (SCFM)
Pipe Size
Model 50MK10
Utilizes stainless steel
capillary tubes cemented
into a stainless steel body.
Inlet, outlet, and differential
pressure connections are
1/4" NPT.
1/4"
1/4"
1/4"
1/4"
1/4"
1/4"
1/4"
1/4"
50MK10-8
50MK10-7
50MK10-6
50MK10-5
50MK10-4
50MK10-3
50MK10-2
50MK10-1
All stainless steel unit with
fused matrix. Differential
pressure connections are 1/4"
NPT. Line connections 1/2"
NPT, except Type 9 which has
a 3/4" NPT.
1/2"
1/2"
1/2"
1/2"
1/2"
3/4"
50MJ10-14
50MJ10-13
50MJ10-12
50MJ10-11
50MJ10-10
50MJ10-9
.00019
.00062
.00124
.0025
.0046
.0081
.0149
.046
SCFM @
"
"
"
"
"
"
"
"
"
"
"
"
"
"
4" water diff.
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
SCFM @
"
"
"
"
"
"
"
"
"
"
8" water diff.
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
Model 50MJ10
0.10
0.18
0.38
0.70
1.60
3.00
Model 50MW20
All stainless steel welded unit
with fused matrix. Line connections are threaded.
Differential pressure connections are 1/4" NPT.
1"
1 1/2""
2"
50MW20-1
50MW20-1 1/2
50MW20-2
7.5
22.0
40.0
1"
1 1/4"
1 1/2"
2"
3"
4"
5"
6"
8"
10"
12"
16"
50MH10-1
50MH10-1 1/4
50MH10-1 1/2
50MH10-2
50MH10-3
50MH10-4
50MH10-5
50MH10-6
50MH10-8
X
50MH10-10 X
50MH10-12 X
50MH10-16 X
7.5
16.0
23.0
40.0
90.0
160.0
250.0
360.0
640.0
1000.0
1440.0
2250.0
SCFM @
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
8" water diff.
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
2 1/2"
3"
4"
5"
6"
8"
10"
12"
16"
50MY15-2 1/2
50MY15-3
50MY15-4
50MY15-5
50MY15-6
50MY15-8
X
50MY15-10 X
50MY15-12 X
50MY15-16 X
60.0
90.0
160.0
250.0
360.0
640.0
1000.0
1440.0
2250.0
SCFM @
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
8" water diff.
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
"
SCFM @ 8" water diff.
"
" "
"
"
"
" "
"
"
Model 50MH10
All stainless steel unit with
fused matrix. Line connections are plain ends (no
threads) for hose connection.
Differential pressure connections are 1/4" NPT.
Model 50MY15
All stainless steel unit with
fused matrix. Differential pressure connections are 1/4" NPT.
Line connections are 150 lb.
flanges.
Model 50MR2
This unit is for low pressure
applications. Differential pressure connections are 1/4" NPT.
Aluminim 150 lb. flanges are
furnished at inlet and outlet
2"
4"
6"
8"
50MR2-2
50MR2-4
50MR2-6
50MR2-8
100.0
400.0
1000.0
2250.0
SCFM @
"
"
"
"
"
"
8" water diff.
"
"
"
"
"
"
"
"
"
This unit is for low pressure
applications. Differential pressure connections are 1/4" NPT.
Designed for use with hose for
line connections at inlet and
outlet
FOR HOSE
2" I.D.
4" I.D.
6" I.D.
8" I.D.
50MC2-2
50MC2-4
50MC2-6
50MC2-8
100.0
400.0
1000.0
2250.0
SCFM @
"
"
"
"
"
"
8" water diff.
"
"
"
"
"
"
"
"
"
Model 50MC2
26
NOMINAL AIR FLOW RANGE
(760 MM Hg. Abs. & 21.1˚C)
CC/MIN
5.38
17.5
35.1
70.8
130
229
422
1300
2.12 x 10 5
6.23 x 10 5
1.13 x 10 6
x
x
x
x
x
x
x
x
x
x
x
x
Kg/M
MAX DP MM H20
0.00538
0.0175
0.0351
0.0708
0.130
0.229
0.422
1.30
6.44 x 10-6
2.10 x 10-5
4.21 x 10-5
8.48 x 10-5
1.56 x 10-4
2.75 x 10-4
5.06 x 10-4
0.00156
101.6
101.6
101.6
101.6
101.6
101.6
101.6
101.6
0.00339
0.0061
0.0129
0.0237
0.0543
0.102
203.2
203.2
203.2
203.2
203.2
203.2
212
623
1130
0.254
0.746
1.357
203.2
203.2
203.2
212
453
651
1130
2550
4530
7080
10200
18100
28300
40800
63700
0.254
0.543
0.780
1.35
3.05
5.43
8.48
12.2
21.7
33.9
48.8
76.3
203.2
203.2
203.2
203.2
203.2
203.2
203.2
203.2
203.2
203.2
203.2
203.2
2.83
5.10
10.8
19.8
45.3
85.0
2830
5100
10700
19800
45300
85000
2.12
4.53
6.51
1.13
2.55
4.53
7.08
1.02
1.81
2.83
4.07
6.37
LPM
10 5
10 5
10 5
10 6
10 6
10 6
10 6
10 7
10 7
10 7
10 7
10.7
Accuracy levels available:
commercial calibration ± 0.86%
reading: master calibration ± 0.70%
reading: independent lab
calibration ± 0.5% reading.
Units available to measure
15,000 SCFM.
All units available with filters
except those marked with X.
For pressures greater than 30
PSIG or 120˚ F, Meriam
Instrument recommends the
Universal Calibration Curve
Method for calculating flow rate
through an LFE. This method
incorporates density corrections
instead of the ideal gas law corrections common to the Classical LFE
equations. While the Classical
equations are excellent at conditions below 30 PSIG or 120˚ F, the
Universal Calibration Method
provides more accurate results
above these values. Consult
Meriam for your higher pressure
or temperature applications and
for sizing assistance.
NOTES
1.69
2.55
4.53
7.08
1.01
1.81
2.83
4.07
6.37
x
x
x
x
x
x
x
x
x
10
10
10
10
10
10
10
10
10
6
6
6
6
7
7
7
7
7
1700
2550
4530
7080
10200
18100
28300
40800
63700
2.03
3.05
5.43
8.48
12.2
21.7
33.9
48.8
76.6
203.2
203.2
203.2
203.2
203.2
203.2
203.2
203.2
203.2
2.83
1.13
2.83
6.37
x
x
x
x
10
10
10
10
6
7
7
7
2830
11300
28300
63700
3.39
13.6
33.9
76.3
203.2
203.2
203.2
203.2
2.83
1.13
2.83
6.37
x
x
x
x
10
10
10
10
6
7
7
7
2830
11300
28300
63700
3.39
13.6
33.9
76.3
203.2
203.2
203.2
203.2
1. The flows and differential pressure rating of production units are
subject to a variation of plus or minus 10% from the nominal values
listed above.
2. Each LFE unit is calibrated with air to Meriam flow standards, which
are traceable to the National Institute of Standards and Technology.
Meriam calibration flow curves are furnished with each unit.
3. A special service is available for those Meriam LFE units, which
are governed by quality programs requiring periodic recalibration.
The Special Calibration Procedure A-33544 is designed to meet the
basic requirements of 10CFR50, ANSI-Z540-I & ML-Q-9858A.
Contact Meriam direct for information.
4. The catalog capacities refer to the following base conditions:
Base flowing gas: Air. Base pressure 29.92" mercury absolute.
Base temperature: 70˚F, 530˚R absolute. Base viscosity: 181.87
microproises. Base Reynolds Number: 300 at 8" H2O, 150 at 4" H2O.
5. SCFM* - See page 6 for definition.
6. All units are offered with optional integral filter on inlet side
except those marked (X). Removal or replacement of filter necessities recalibration.
7. Rated flow pressure and temperature for standard units are 30
psig and 150˚F. to maintain laminar flow, calibration, linearity and
accuracy. For higher pressure and temperature rating call Meriam
Representative or direct to Meriam Instrument.
INSTALLATION
Due to asymmetry of filter elements, calibration accuracy
of assembly cannot be guaranteed if filter is removed for
any reason. If filter is removed, the assembly should be
recalibrated to ensure accurate performance.
27
Meriam’s Accutube Flow Sensors
Meriam’s Accutube Flow Sensors are lab-tested and field-proven flow elements perfect for gas, liquid or steam
service. With thousands in use worldwide, the Accutube continues to be the right choice when ease of installation,
cost effective operation and highly accurate performance is required.
The Accutube averaging Pitot tube is a head type device, which generates a differential pressure signal similar to the
orifice, venturi, flow nozzle, and other head producing primary elements. It can be used for flow measurement only
or with static pressure and temperature transmitters as the primary measurement source for a flow control loop. It
has been proven that the Accutube’s flow measurement accuracy is better than that of the orifice. The Accutube also
generates considerable cost savings with its simple installation and wear-free, energy-efficient design, providing a
viable alternative to traditional flow measurement devices.
Principal of Operation
The Accutube is an annular averaging Pitot device, which is simply inserted into a pipe or duct through a weld
coupling and packing. Based on pipe or duct size, the Accutube is constructed so that strategically located sensing
ports continually sample the impact and static pressures produced by the Accutube’s obstruction of the flow stream
profile. Within the probe, the impact pressures sensed by the upstream ports are continually averaged in an isolated
plenum chamber. Similarly, the static pressures sensed by the downstream ports are averaged in a second isolated
plenum. A readout device is then used to indicate the differential between the two-plenum chambers.
Meriam Accutubes are provided in a wide variety of models enabling you to select the probe diameter and mounting
configuration compatible with your application needs. Meriam also has available special mounting hardware, valves
and materials for use in high temperature and pressure applications and corrosive environments.
For convenience in selecting and sizing Accutubes for your applications, please refer to the data form found on page
25 in this catalog. Complete the form and submit it to the factory for detailed analysis and configuration. For
further assistance on Accutube sizing and selection, feel free to contact Meriam Instrument or your local Meriam
representative. You can request the "Accutube Selection and Sizing Data Sheet" if you need detailed steps on
selection and sizing.
Accutube: Features
Accuracy
Convenience
True double averaging design
+1% of rate accuracy
+0.1% repeatability
Tested and certified by independent flow labs
Applicable to gases, liquids, steam
Simple installation and maintenance
Four standard models and probe sizes: Insertion,
Flanged, Wet tap with socket or gear drive
retraction, Integral three-valve manifold, optional
Bi-directional flow sensing
Confidence
Testing by the Utah Research Laboratory-Utah
State University, the University of Michigan
and testing against NIST traceable Meriam
flow elements confirm typical accuracy of
±1% of rate
Material Certification and Certificate of
Conformance per customer specification are
available.
Certified welding fabrication to ASME Code,
Section IX Procedures.
Dye penetrant and hydrostatic testing capability.
Canadian registration number.
28
Efficiency
Low permanent head loss saves energy and cost
Multiple tube design offers superior strength and
clog resistance
Unaffected by wear
No system shutdown with wet tap model
Ideal for flow system upgrades and expansions
Integral 3-Valve head option saves installation
piping and transmitter mounting time.
Gear Drive wet tap reduces insertion and
retraction time
Accutube: Low-Cost Flow Measurement
The Accutube reduces initial costs through low purchase price and reduced
installation cost.
The purchase price of an Accutube will almost always be less expensive than other head producing primary elements. Meriam’s simple and effective Accutube design allows us to pass fabrication savings on to you. When
mounting hardware is considered, the Accutube will always be low in cost. No flanges are required, just the simple
mounting hardware included with the Accutube. Choose the integral 3-valve manifold Accutube head to reduce
your transmitter mounting and piping costs.
The Accutube’s installation costs are also low. On an 8-inch pipe, for example, installation of the Accutube’s mounting thredolet requires only 4 linear inches of welding while orifice flanges for the same size pipe require 50 linear
inches. Orifice flanges also require pipe cutting, weld preparation and weld cleanup. With the Accutube, simply
weld on the thredolet, bore a hole, install the Accutube and tighten the packing gland. You’re ready to go!
Operational savings continue
with low-cost maintenance, wet tap flexibility and low permanent head loss.
The Accutube simplifies preventive maintenance with its clog-resistant and wear - free design. This combination
brings downtime to a minimum and frees you to concentrate on the process itself.
If shutting down your process is too costly, then look to Meriam’s Wet Tap Accutubes. These Accutubes can be
inserted and retracted without process interruption, after being installed without process shutdown. This flexibility
gives you the ability to spot check the process, inspect the Accutube and pig or flush the line without Accutube
damage while eliminating the need for by-pass piping and valve systems. Choose from socket or gear drive retraction options to meet your needs.
Accutubes save you money by causing less permanent pressure loss. Permanent pressure loss (unrecoverable head
loss) is the system energy lost due to the primary element’s obstruction of the flow stream. This pressure drop is
what your pump or fan has to overcome and is directly related to system operating costs. The Meriam Accutube is
much less of a flow obstruction than other primary elements. Test results on the Accutube show typical unrecoverable head loss of 2 –10 % of the produced differential pressure. This means that there is much less permanent pressure loss, less work for the pump or fan to do and much lower operating costs. The difference in using Accutubes
versus orifice plates can add up to hundreds of dollars per year in pump or fan horsepower per measurement point.
Accutube: Installation Requirements
Meriam Accutubes perform best when installed in the proper orientation with respect to piping configuration. The
following diagrams and tables show correct installation orientation and straight-run requirements both upstream
and downstream of the Accutube location.
Sensor Orientation
HORIZONTAL LINES
Bottom Entry
Side Entry
Top Entry
VERTICAL LINES
Special 90° Rotated Accutube Head
recommended for liquid and steam use.
29
Accutube: Series 10A and 11A
30
Accutube: Series 20T and 21T
03
31
Accutube: Series 22L and 23L
32
Accutube: Series 24D and 25D
33
Accutube: Series 33T Low Pressure Wet Tap
34
Accutube: Series 37L High Pressure Wet Tap
BODY MATERIAL
ORDER
316SS Head and
Probe
For Special Material
Consult Factory
03
SP
SD
GD
Socket
Drive
Gear
Drive
35
Accutube: Series 40H thru 43H
36
Accutube: Series 70H & 72H(with RTD)
37
Accutube Sizing Worksheet
38
Orifice Plates - Model 951
Meriam Orifice Plates
Meriam Instrument provides orifice
plates designed and manufactured to
AGA, ISA, ASME and ISO-5167 standards. Tolerances and specifications
are tightly controlled for greatest
precision and reliability. Materials
available include 304SS, 316SS,
Monel, Inconel and Hastelloy. Plates
can be designed for all ANSI flange
ratings and standard pressure tap
locations. Calculations as well as
flow versus differential pressure and
temperature and pressure correction
curves are available.
Orifice Flanges - Model 952
Meriam raised face orifice flange unions are designed to provide a convenient, accurate method for installing
orifice plates. They incorporate accurately positioned pressure taps for connecting the flow measuring instruments.
This eliminates the requirement of locating pressure taps in the field. Improper location of these taps will result in
poor accuracy of the flow measuring system. These built-in taps also reduce field installation labor necessary for
welding, drilling and/or tapping pressure taps on the flow line itself. Meriam orifice flanges are provided complete
with nuts, bolts, gaskets, and plugs for installation with no other parts required. Contact Meriam or your local
representative for dimensional information and special pipe sizes.
To order Meriam orifice flanges, specify
1. MODEL
2. LINE SIZE
3. MATERIAL
4. PRESSURE RATING
5. LINE CONNECTIONS
MODEL 952 FS 30
forged steel, slip-on welding, pipe sizes 1"-24"
300lb. raised face
For systems where welded connections are required. These flanges
are slipped over the pipe which is brought flush with the flange
face. The pipe is then welded to the flange.
MODEL 952 FW 30
forged steel, welding neck, pipes 1"-24"
300lb. raised face
Similiar to slip-on welding model but for use where weld neck is
preferred. These flanges are butted up against the ends of the pipe
and welded in place.
MODEL 952 FT 30
forged steel, threaded, pipes 1"-12"
300lb. raised face
Designed for systems where threaded connections are suitable
and conditions require forged steel.
MODEL 952 PV 15
PVC socket type, pipes 3⁄4"-8"
150lb. raised face
PVC orifice flanges are socket type where the connecting line is
solvent welded to flanges. Pressure connections are corner tap.
39
Orifice Bore Calculation Specification Form
FILE NO. 951:411 – 2
11 – 89
ORIFICE PLATE DATA SHEET
CUSTOMER_____________________________ MERIAM ORDER_____________
P.O. NO.
_____________________________ MODEL_____________________
TAG NO.
______________________________
1. Tap Location
Flange Pipe Vena Contracta Corner Radius
2. Plate Material
304 SS 316 SS
_________ (other)
3. Base Pressure
14.73 PSIA
or
_________ (other)
4. Base Temperature 60 F
or
_________ (other)
5. Inlet Pressure
_____PSIG or
_________ PSIA or _________ (other units)
6. Flow Temperature _____F
or
_________ C
7. Pipe Nominal Size _______ inch Schedule _______
or Inside Diameter ________ inch or _________ mm pr _________ (other unit)
8. Vent/Drain Hole & Size (choose one) None____ Vent____ Drain ____ Size _____
Type of Calculation (CHOOSE ONE) Beta Ratio
(bore)
NOTE:
Flow Rate
Differential
Pressure
Units must be indicated: Flow – GPM, PPH, SCFM, etc.
DP – Inches of Water, PSI, etc.
Beta Ratio Calculation
Max. Flow Rate
Normal Flow Rate
Differential Pressure
_______units________
_______units________
_______units________
Flow Rate Calculation
Desired Flow Units _____
Beta Ratio
_____
OR Orifice Bore
_____units___
Differential Pressure _____units___
Differential Pressure Calculation
Max. Flow Rate
____Units____
Normal Flow Rate
____Units____
Beta Ratio
____Units____
OR Orifice Bore
____Units____
9. Type of Fluid (Name) ______ Water ______
Liquid
Gas
_____________________Steam
Vapor
IF WATER, STEAM OR AIR S T O P
__________ _____________
_____________
centipoise
micropoise
(other unit)
11. Specific Heat Ratio ___________
12. Specific Gravity (liquid) OR Density
at Base _______
Base _________#/ft or __________gm/cm
at Flow _______
Flow _________#/ft or __________gm/cm
13. Specific Gravity (gas/vapor) OR Density
at Base ________
Base _________#/ft or ________gm/cm
Flow _________#/ft or ________gm/cm
14. CURVE ___Yes ___ No
Type of Curve
SERIAL NO. ________
Flow vs DP (no additional info needed)
Temp Correction Range _____to_______
Press Correction Range _____to_______
10. Flow Viscosity
Submitted by ______________________________________ Date __________________
40
Flow Measurement Systems
Meriam Instrument’s Flow Measurement Systems are used in conjunction with differential pressure
producing primary flow elements (such as Laminar Flow Elements, Accutubes, Orifice Plates, Venturis
etc…) to quickly and automatically determine volumetric flow rate, mass flow rate and total flow. Meriam
offers several options to suit your application requirements. The systems are usually ordered with all
transducers necessary to measure the critical parameters of the application. Flow can be calculated using
our state of the art flow computers or in some cases by using the power of your own PC. Any head type
(square root) primary element can be modeled as well as Laminar Flow Elements (LFEs). See the
following pages for more details.
LFS-1 Flow Measurement System
The LFS-1 Flow Measurement Systems for Meriam
Laminar Flow Elements take advantage of the
wide flow turndown and the percent of Reading
precision of the LFE, as well as the application
and calibration expertise of Meriam, to provide a
superior gas flow measurement solution. LFEs
are industry standards for the calibration of a
wide variety of flow devices such as variable
area meters, orifice plates, flow nozzles, thermal
mass flow meters, turbine meters, regulators and
valves. The broad range of flow measurement
they offer make LFE Measurement Systems excellent choices for measurements of engine intake air flow,
electronics cooling, leak detection and quantification, production line quality control, component design
and product certification applications. The integral flow computer makes real time corrections for changes
in static pressure, temperature and relative humidity to provide the most accurate results
possible. Calibration coefficients for up to five (5) LFEs can be stored in memory and called up for
use later with a push of a button.
Special application requirements can often be accommodated by the LFS. For example, simultaneous flow
measurement of two LFEs can be made and the summation of the two flows calculated and
displayed. Or, for testing over a wide range for flow, the LFS can be set up to automatically switch from
one LFE to another as flow rates change. Standard digital outputs on the LFS change state as the flow rate
moves from the capability of one LFE to another. External solenoid valves can be used to switch the DP
and P transducers to the active LFE. For control or data transmission purposes, the LFS Flow
Measurement System has both analog and digital outputs. 4 – 20 mA and 0 – 10 volts analog output
options are ideal for control and recording functions. RS-232 or RS-485 digital communications are
standard to facilitate communication with a PC and documentation of test results.
The LFS Flow Measurement Systems (LFS) provide standard system accuracy’s of ± 1.0% of Reading over
a 10:1 flow turndown and ± 1.1% over 20:1 turndown. Calibration of the LFE and LFS Flow Measurement
System together makes this possible. By using better calibration standards, Meriam can offer LFS
accuracy as low as 0.60% of Reading over a 10:1 flow turndown. All LFS packages include complete
system calibration and NIST traceable documentation. LFEs and systems cover gas flow ranges from
0.5 SCCM to 15,000 SCFM. See the Laminar Flow Element section of this catalog for more details on the
LFE models available.
41
LFS-3 FLOPAC Flow Measurement System
The Meriam Instrument FLOPAC Flow
Measurement System is designed to allow
Laminar Flow Element users to accurately
measure gas flow using state-of-the-art electronic instrumentation and software. Real-time
data measured by the system instrumentation
is transmitted via RS-485 to a personal computer. The SOFTFLOW software enables the
PC to automatically calculate flow rate and
compensate for changes in line pressure, temperature, and relative humidity. System accuracy is ±1.0% at full scale of the LFE and
±2.0% at 10:1 turndown. The user selects units
for flow rate, temperature, and pressure using
the system software. Configurations for multiple flow elements can be saved and then
recalled for later use. Results of flow tests can
be saved to a file for post processing or archiving purposes. Software developments for primary elements such as Accutube averaging
pitot tubes and Orifice plates are pending.
FLOPAC system components are housed in a NEMA 4X steel enclosure.
Power to the enclosure is 110 or 240 VAC through a 15 ft. power cord. The
internally mounted power supply provides 24 VDC power to the system.
Meriam model 1500 Smart Transmitters with RS-485 output are used to
measure the differential and inlet pressure. A dual temperature / humidity
sensor provides analog signals for these variables. A/D converters in the
FLOPAC enclosure convert this data to an RS-485 format as well. All measured parameters are transmitted to the user's PC on a single RS-485 cable.
Since most PCs are equipped to handle RS-232, the FLOPAC system
includes an RS-485 to RS-232 converter (and power supply, cables) to allow
the PC to receive the DP, P, T and RH measurements. With this data the PC
can calculate the corrected flow rate using the SOFTFLOW software. The
user can select display options of actual volume, standard volume or mass
flow.
SOFTFLOW is a Windows based set-up software that
facilitates configuration of the desired flow program
and selection of the primary element. The menu driven program guides the user through initialization of
communication settings, selection of calculation
method and selection of engineering units. The "Flow
Display" screen shown at right displays the measured
parameters, calculation method and primary element
being used. The user can select Actual or Standard
Volume Flow or Mass Flow displays. For post-test
data processing or archiving purposes, all measured
and calculated data can be saved as a comma delimited file (.CSV extension). Excel can be used to open
these files for viewing purposes, data processing or
graphical presentation.
42
Smart Multivariable Transmitter Flow
Systems for Accutubes, Orifice Plates
Smart Multivariable Transmitters (SMVs) are excellent for users who want to reduce the price of traditional
head type flow meter installations. Head or differential pressure-type primary elements produce differential
pressures (DPs) that are proportional to actual flow volume. This is fine for most liquid flow measurement
but the measurement of gas or vapor flow becomes more involved if standard volume flow or mass flow is
required. Inlet pressure and temperature need to be measured in addition to the DP. Traditional electronic
flow meters for gas or vapor require a DP transmitter, a Pressure transmitter, RTD or thermocouple, and
flow computer. Purchase price for all these components is relatively high since four secondary devices
must be purchased in addition to the primary element. Installation costs are relatively high as well since
the transmitters, temperature device and flow computer need to be mounted, piped to the primary element
and wired together. SMVs measure both the DP and the inlet pressure with one device. And that is not all
of the advantages they offer…
SMVs reduce the total installed cost of gas or vapor flow meters by:
1) reducing the number of secondary instruments needed for gas or
vapor flow from four to two
2) directly mounting to primary elements designed for flange
mounting, eliminating high and low pressure piping
3) eliminating the need for mounting brackets
4) eliminating or reducing to a minimum the wiring between
transducers and the flow computer (temperature wiring still needed)
5) integrating the flow computer within the SMV
To take full advantage of the strengths that SMVs offer, Meriam Instrument has two head - type primary
elements to choose from. Traditional orifice plates and flanges are described earlier in this catalog and
SMV programming includes all common orifice plate calculation models. Accutubes are also prime candidates for SMVs. Meriam has designed a new style of Accutube averaging pitot tube that will be of great
interest to customers needing accurate and convenient flow measurement of steam, gas or liquid flow
through a process pipe. Models 40H, 41H, 42H, 43H, 70H and 72H are presented earlier in this catalog.
These Accutubes have integral 3-valve manifold heads that allow DP or Multivariable transmitters to be
bolted directly to the Accutube head. This feature eliminates mounting brackets, connecting tubing and
tube fittings. O-rings provide the seal to the transmitter and temperatures and pressures in excess of most
transmitter limits are supported. Models 40H (single support) and 41H (double support) are for DP
transmitters and have 316LSS probes and 3-valve instrument heads. Models 42H (single) and 43H
(double) are for the SMV transmitter since they include an integral 100-ohm RTD temperature device.
The RTD is serviceable without shutting off the flow stream and without removing the transmitter from
the Accutube. For wet - tap style Accutube applications, Meriam offers the 70H model for DP transmitters and the 72H model for SMV transmitters. In combination, the new Accutubes and SMV transmitters
represent a convenient and cost effective way to add measurement points to existing process areas or
to equip a new plant or expansion.
Meriam Instrument offers complete technical assistance and product lines for all of your pressure and
flow measurement needs. Please call Meriam or your local Meriam Representative for application assistance, price quotes and delivery information today.
43
10920 Madison Avenue • Cleveland, OH 44102
Telephone 216-281-1100 • Fax: 216-281-0228
www.meriam.com
E-mail: [email protected]
10M 3/01 FILE NO. 001:200-26