GE
Sensing
The Modus Model DA is a controller designed for the
monitoring of low differential pressures. It combines in
one enclosure a low pressure transducer, a digital display,
and up to two alarms (see figure 1).
panel. Figure 2 shows a typical deadband diagram for an
alarm energizing on falling pressure. When the
momentary push button is pressed, the reading on the
display is the position of the midpoint of the deadband.
A 4 to 20 mA output is also available as an option. The
Modus Model DA controller is typically used for the
monitoring of clean room pressures, duct static and
velocity pressures; as well as filter differential, draft, fume
hood, and other low pressure applications.
When the potentiometer is turned all the way
counterclockwise, the lowest reading appearing on the
display is half the deadband. Barb fittings and pluggable
terminals with screw clamps are provided at the rear for
quick and simple field connections.
The pressure sensing element is a differential
capacitance cell for pressure measurements ranging
from 0.1 in to 5.0 in (2.5 mm to 127 mm) of water (25 Pa
to 1.0 kPa), or a piezoresistive (silicon) sensor for
pressures from 5 in (127 mm) of water to 30 PSI (1.0 kPa
to 200 kPa).
The display section has three 1/2 digits with bright, easy
to read LEDs. The display is factory-calibrated to read in
engineering units.
The alarm section is offered with one or two alarms. Each
alarm may be ordered with a relay or transistor output.
Each setpoint is displayed by pressing a button on the
front panel and its setting is changed by means of a
multiturn potentiometer also accessible on the front
Modus Model DA
General Eastern Low
Differential Pressure
Alarm Controller
Modus Model DA is a General
Eastern product. General Eastern
has joined other GE high-technology
sensing businesses under a new
name—GE Industrial, Sensing.
g
Pressure
Hi
Lo
Power
VAC, In
Setpoints
1
2
Outputs
1
Pressure
transducer
Alarms
Power
supply
1.8.8.8
display
2
Figure 1_Block Diagram
GE
Sensing
Model DA
Specifications
3.93 in (89.6 mm)
Screw clamp
2 places
On
*=Deadband
Output
state
0.30 in (75 mm)
1*
2
1*
2
Minimum
setpoint
Setpoint
1*
2
3.78 in (96 mm)
Off
0
Pressure
Top View
Figure 2_Deadband Diagram
Modus
General
Accuracy of Reading
Standard ±1% of span one digit (including non-linearity
and hysteresis)
3
2
1
Setpoint
Inches of water
Front View
Alarm receptacle
(plug not shown)
1 2 3 4 5 6 7 8 9
Alar m1
Setpoint Accuracy
±0.2% of span one digit (including repeatability)
HI
J3
Alar m2
A
B
0.19 in (4.75 mm) OD
pressure fittings
LO
J1
AC Power
AC power receptacle
(plug not shown)
Rear View
5.72 in (145 mm)
Power Requirements
21 to 32 VAC, 50/60 Hz, 105 to 135 VAC, 50/60 Hz or 210
to 265 VAC, 50/60 Hz
Electrical Connections
Non-interchangeable power and alarm plugs with #4-40
screw clamps; wire range is 14 to 22 AWG
1.89 in (48
mm)
Power Consumption
2.5 VA
5.28 in (134 mm)
0.25 in (6 mm)
maximum panel thickness
1.67 in
(42.5 mm)
Side View
3.62 in (92 mm)/
3.65 in (92.8 mm)
Plug with #4-40 screw
clamp wire range:
14-22 AWG
177 in (45 mm)/
1.8 in (45.6 mm)
Warmup Time
Five minutes to rated accuracy
Panel Cutout
(Per DIN standard 43700)
Modus Model DA dimensions
GE
Sensing
Model DA
Specifications
Pressure Transmitter
Measures differential, gage pressure or vacuum
Medium
Air or inert gases
Standard Pressure Ranges
See table A for English units and metric units
Maximum Safe Momentary Overpressure
See table A
Zero and Span Adjustments
15-turn potentiometers accessible behind red front filter
Port Connections
3/16 in (4.75 mm) diameter suitable for 1/8 in or 5/32 in
ID Tygon™ or polyurethane tubing; 1/4 in OD
polyethylene tubing. Air filter at both ports
Display
Display
Three 1/2 digits, seven segments, orange-red LEDs,
0.56 in (14.2 mm) high, decimal point
factory-programmable to four positions (1.8.8.8)
Conversion Rate
Three readings/second
Polarity
Automatic, no positive sign, “–” negative sign
Overrange Indication
Beyond 1999 display shows “1”
Zero and Span Adjustments
15-turn potentiometers accessible behind red front filter
Alarms
Number of Alarms
One or two alarms
Setpoint Adjustment
15-turn potentiometer accessible through hole in front
filter
Setpoint Display
By pressing momentary push button in front of controller
Deadband
Factory set at 5% of range to prevent output chatter in
most applications
Output
Each alarm is available with either:
A) • SPDT (One form C) electromechanical relay;
contacts
• rated at 5 A 30 VDC 120 VAC, or 4 A at 240 VAC
resistive
• Contact material is gold overlay
• Isolation between contacts and coil is 2000 VAC one
minute
B) • Transistor (NPN with open collector) rated at:
40 VDC off-state voltage
• 120 mA DC on-state current when using an external
power supply
• 40 mA per alarm when using the internal 5 VDC
supply (consult factory for higher currents)
• 0.4 V saturation voltage at 100 mA
• Internal diode to absorb transients when the
internal 5 VDC supply is connected to inductive
loads
GE
Sensing
Model DA
Specifications
Environmental
Operating Temperature
32°F to 125°F (0°C to 52°C)
Storage Temperature
-40°F to 185°F (-40°C to 85°C)
Relative Humidity
0 to 90% non-condensing
Effect of Temperature
±0.03%/°F reading (±0.05%/°C reading), ±0.005%/°F
(±0.01%/°C) setpoint
Physical
Dimensions
1/8 DIN case (see drawing)
Case Material
Glass-reinforced NORYL® rated UL94V-1
Weight
1.0 lb (454 g)
Offset
If the controller must operate when a reversal of pressure
occurs, then an offset must be specified. To order a
controller with offset zero, estimate the maximum
positive pressure excursion needed and select the
appropriate pressure range from Table A. Then estimate
the maximum negative pressure excursion. If it is about
equal to the positive excursion, specify “B” offset. If the
negative excursion is less than half of the positive
excursion, specify an “A” offset.
Alarm Outputs
• R Electromechanical relay
• T Transistor, NPN with open collector
(specify if external power supply is used)
The above alarms can be configured at the factory to
energize on rising or falling pressure. To specify the logic,
add the following letter after the alarm type:
• R Energizing on rising pressure
• F Energizing on falling pressure
For example: Alarm one is selected with a transistor
energized on falling pressure, the ordering code is “TF”.
Alarm two is a relay energized on rising pressure, the code
would be “TR”.
GE
Sensing
Model DA
Specifications
Wiring Diagrams
Standard Pressure Ranges
Pressure
Range
0 to 0.1 inH20
0 to 0.2 inH20
0 to 0.5 inH20
0 to 1.0 inH20
0 to 2.0 inH20
0 to 5.0 inH20
0 to 10.0 inH20
0 to 20.0 inH20
0 to 1 psi
0 to 2 psi
0 to 3 psi
0 to 5 psi
0 to 15 psi
0 to 30 psi
Displayed
Units(2)
.100
.200
.500
1.000
1.999
5.00
10.00
19.99
1.000
1.999
3.00
5.00
15.00
30.0
Resolution
0.001 in
0.001 in
0.001 in
0.001 in
0.001 in
0.01 in
0.01 in
0.01 in
0.001 in psi
0.001 in psi
0.01 in psi
0.01 in psi
0.01 in psi
0.1 in psi
Maximum
Overpressure
5 in
5 in
5 in
20 in
20 in
5 psi
5 psi
5 psi
15 psi
15 psi
15 psi
15 psi
30 psi
60 psi
**E Contact factory for other pressure ranges displayed units and resolution.
Metric Units, Millimeters of Water
Pressure
Code(1)
01M
02M
04M
05M
06M
08M
09M
11M
13M
14M
15M
16M
17M
Pressure
Code(1)
01P
02P
04P
05P
06P
08P
09P
11P
13P
14P
15P
16P
17P
Pressure
Range
0 to 25 Pa
0 to 50 Pa
0 to 100 Pa
0 to 250 Pa
0 to 500 Pa
0 to 1.0 kPa
0 to 2.5 kPa
0 to 5.0 kPa
0 to 10 kPa
0 to 25 kPa
0 to 50 kPa
0 to 100 kPa
0 to 200 kPa
Displayed
Units(2)
250
50.0
100.0
250
500
1.000
2.50
5.00
10.00
25.0
50.0
100.0
199.9
Resolution
0.1 Pa
0.1 Pa
0.1 Pa
1 Pa
1 Pa
1 Pa
10 Pa
10 Pa
10 Pa
100 Pa
100 Pa
100 Pa
100 Pa
Maximum
Overpressure
1.25 kPa
1.25 kPa
1.25 kPa
5.0 kPa
5.0 kPa
35 kPa
35 kPa
35 kPa
100 kPa
100 kPa
100 kPa
200 kPa
400 kPa
**P Contact factory for other pressure ranges displayed units and resolution.
English Units
Pressure
Code(1)
01E
02E
04E
05E
06E
08E
09E
11E
15E
16E
17E
18E
19E
20E
Metric Units, Pascals
Pressure
Range
0 to 2.50 mmH20
0 to 5.00
0 to 10.0
0 to 25.0
0 to 50.0
0 to 100
0 to 250
0 to 500
0 to 1.00 m
0 to 2.50 m
0 to 5.00 m
0 to 10.0 m
0 to 20.0 m
Displayed
Units(2)
2.50
5.00
10.00
25.0
50.0
100.0
250
500
1.000
2.50
5.00
10.00
19.99
Resolution
0.01 mm
0.01 mm
0.01 mm
0.1 mm
0.1 mm
0.1 mm
1.0 mm
1.0 mm
.001 m
.01 m
.01 m
.01 m
.01 m
**M Contact factory for other pressure ranges displayed units and resolution.
Maximum
Overpressure
125 mm
125 mm
125 mm
500 mm
500 mm
3.5 m
3.5 m
3.5 m
10 m
10 m
10 m
20 m
40 m
(1) Use this code when ordering.
(2) This column shows the number of digits that are displayed and the position of the decimal
point.
J3, Connector
Controller
C
NO
NC
1 (4) Terminals
2 (5)
3 (6)
Relay
Figure 3_Relay output
Shows the internal wiring of the electromechanical relay. This type of
output will switch small loads such as pilot lights or audible alarms. Also,
the gold contacts offer a reliable output when a contact closure must be
sensed and the current is very low.
J3, Connector
Controller
1 (4) Terminals
Transistor
2 (5)
+5 VDC
Diode
3 (6)
Solid-state
relay
Figure 4_Transistor output, internal power supply
A wiring diagram of the transistor output connected to a solid-state
relay. The input voltage range of the relay is 3 to 32 VDC. Power is
supplied by the internal 5 VDC supply of the controller. If an inductive
load is connected, the internal diode will protect the transistor against
transients.
GE
Sensing
Model DA
Specifications
Controller
J3, Connector
Diode*
1 (4) Terminals
Transistor
2 (5)
+5 VDC
Load
Power
supply
40 VDC
maximum
3 (6)
*Diode required with inductive loads.
_
Figure 5 Transistor output, external power supply
Shows the transistor controlling a load powered by an external
12 or 24 VDC supply. An external diode or other means of limiting
transients to 40 Volts must be added if the load is inductive. The current
must not exceed 120 mA.
Ordering Information
Record selected option in blank indicated at bottom of form.
DA
Code
1
2
3
Power Supply
120 VAC
240 VAC
24 VAC
Code Input Pressure
X
See Standard Pressure Range Tables
Code Offset
0
No offset
A
1/4 offset
B
1/2 offset
Code Alarm Output
R
Electro mechanical
T
Transistor
Code Energize (E)
F
Falling pressure
R
Rising pressure
Code Option
420
4 to 20 mA output
DA - ___ - ___ - ___ - ___
-
___
-
___
Typical model number
GE
Sensing
GE
Sensing
g
©2006 GE. All rights reserved.
920-295A
All specifications are subject to change for product improvement without notice.
GE® is a registered trademark of General Electric Co. Other company or product
names mentioned in this document may be trademarks or registered trademarks
of their respective companies, which are not affiliated with GE.
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