Roxar CorrLog D
High Accuracy Corrosion Monitoring
Data Sheet
Introduction
Improved Performance
Protecting the integrity and extending the life of
upstream assets is the number one priority for operators
today. That’s why the Roxar CorrLog D provides the
complete corrosion monitoring solution.
• More loggers per cable loop
• More frequent measurements
• Can read probes from most common suppliers
• Updated electronics, improved performance
Together with Emerson's Roxar range of corrosion
probes and software solutions, Roxar CorrLog D
provides high accuracy Electrical Resistance (ER), Linear
Polarization Resistance (LPR) and galvanic probe
measurements from the same instrument. Roxar
CorrLog D is provided in explosion proof design, for
service in hazardous areas, and with state of the art
performance and flexibility.
High Accuracy
Multipurpose Instrument
• High accuracy Electrical Resistance (ER) probe function
• Linear Polarization Resistance (LPR) function
• Galvanic Probe function
• Same probe cable and connections for all
functions above
• 24 bit resolution, or 0.067 ppm of probe element thickness
• Power and communication via Field Interface Unit (FIU D)
• No internal batteries in instrument units
• All raw data available for user for review and verification
Roxar Fieldwatch Software
• Set up and control of system
• Data management and reporting
• Data sharing between multiple locations
• Alarms and communication to main control systems
via OPC or Modbus protocols
Description
System Description
Corrosion Probes are connected through a probe cable
to the Roxar CorrLlog D instrument (max length 20
meters). This adds flexibility for instrument access even
if the probes are installed at inaccessible locations.
Raw data (resistance values) are transferred to the Roxar
Fieldwatch program, where they are converted to metal
loss. Raw data access enables probe data for verifying
the condition of the probe and to track and compensate
for temperature changes on the probe. Additional
temperature compensation of the data can be done in
Fieldwatch software should that be required.
Roxar CorrLog D and the Field Interface Unit (FIU D)
are powered by an external 24VDC power supply and
communicate via the same Field Bus Cable. The FIU D
must be installed in safe zone (normally in a cabinet
in the control room), but can also be installed in an
explosion proof enclosure in hazardous area.
Due to its open and flexible design, Roxar CorrLog D can
read probes from most manufacturers, including probes
in the market named as "high accuracy probes".
Data is forwarded from FIU D to a PC server where
Roxar Fieldwatch software is installed. A range of
communication options are available, RS 232, RS 485,
GPS/GPRS, radio, etc. Roxar Fieldwatch is a multiple user
software that provide analysis and reporting functions,
and communicates with main control systems through
OPC or Modbus protocols.
LPR (Linear Polarization Resistance) measurements are
based on measuring the current response to a small
polarization of the probe's working electrode in a
2- or 3- electrode configuration. The corrosion rate is
proportional to the measured current response, and
utilizing empiric factors, the corrosion rate can be
determined directly from one measurement only.
Measurement Principles
LPR measurements require a conductive electrolyte
(water) to perform, and are therefore normally used in
water containing systems only.
Roxar CorrLog D features three different measurement
principles in one instrument. This means that the same
instrument can be used for different types of probes,
and probe types can be changed without changing the
instrument or cables.
ER Probe Measurements
ER probe measurements are based on measuring changes
in resistance of the probe's measurement element and
comparing this with the resistance of a reference element
that is not exposed to corrosion. Metal loss (and metal loss
rates) is calculated from the changed resistance value ratio
between the two elements. Roxar CorrLog D performs
high accuracy measurements of resistance individually in
each probe element, with a 24 digit resolution.
LPR Probe Measurements
Galvanic Probe Measurements
Galvanic Probe measurements are based on measuring
the galvanic current between a brass and a carbon steel
electrode, which are electrically connected through the
Roxar CorrLog D meter. The galvanic current depends on
the oxygen level. The galvanic probe is a fast response
sensor for detecting oxygen where oxygen should not
be present. Galvanic probes should not be used for
quantifying oxygen levels.
Integrated Flow Assurance
Monitoring System
Roxar CorrLog D forms a part of an integrated flow
assurance monitoring offering from Roxar, that also
includes:
• Intrusive Sand/Erosion Monitoring (Roxar SandLog D)
• Non-intrusive corrosion monitoring (Roxar FSM)
• Non-intrusive acoustic sand monitoring (Roxar SAM)
• Non-intrusive acoustic pig detectors
• All integrated in one cabinet, and controlled by
Roxar Fieldwatch Software
Integration of the functions above provides commercial
and technical advantages in the project, installation,
training and after sales support phases - in addition to
reduced hardware requirements since the same cabinet,
cabling, and server can be used for multiple functions.
Dimensional drawings:
Tag ID
marking plate
70 mm
Product certification
marking Plate
Mounting bracket
External ground
m
0m
5
1
Locking screw
Breather plug
Cable glands
140 mm
FA-T214A/280114
Specifications
Item
Description
General:
For connection of one ER, LPR or galvanic probe (one probe only at the time)
Logging and storage:
Measurement interval from 1 minute to 24 hours
1500 readings, each including measurement results, probe #, hour, day, month and year
Communication:
Roxar Field Bus
Resolution and Accuracy:
LPR function: 1% of measured current and voltage for LPR measurements
ER function: Resolution 24 bit (0,067 ppm of probe element thickness). Total accuracy
10 - 100 ppm of probe element thickness, depending on probe type, measurement frequency
and environmental conditions.
Current resolution galvanic probes: 0.01μa
Power requirements:
24VDC external power supply
Cable length:
700 meters - and 8 Roxar CorrLog D/Roxar SandLog D units per loop (depends on distribution
and set-up of instruments - please contact Emerson/Roxar for details for your specific need)
Operating temperature:
Standard -40°C to +70°C / -40°F to +158°F
Housing:
Stainless steel (AISI 316L), IP66 Nema 4x
Dimension:
Approximately 150 x 140 x 70mm
Weight:
Top cover: 1.7kg, Base plate: 1.5kg
Cable connector:
Cable gland M25 (M20 with adapter)
Certification:
ATEX /IEC – II 2G Ex d IIC
NEC 505 – Class I, Zone 1
Temperature Classification - T4
EMC:
According to EN61326-0
Ordering Model Codes - Roxar CorrLog D:
P/N Topside Exd Instrument Assembly Model No.
-CLOG
T
Product
Code
Topside portifolio
T
-EXIWFB
Roxar Probe Cable gland
Model Hawke 501/453/
Universal Ex de
Type
Code
CorrLog
CLOG
-S
-deABM20
-deABM20
-TG0
Tag
Roxar Field Cable gland
Model Hawke 501/453/
Universal Ex de
Material
Code
Material
Code
No Gland
NA
No Gland
NA
Type
Code
C
No Tag
TG0
Standard
TG1
Brass
deABM20
Brass
deABM20
Instrument
Code
NickelPlated
deANM20
NickelPlated
deANM20
Material
Code
Exd-Wired-Fieldbus-SS
EXDWFB
Stainless Steel
deASM20
Stainless Steel
deASM20
Stainless Steel
S
Sundheim-Madison 1-2014
Blind/Drain
Roxar
CorrLog D
w w w. r o x a r. c o m
For further information
please contact your
regional office or
email: [email protected]
or visit www.roxar.com.
Head Office
CIS
Europe
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Tel: +47 51 81 88 00
Tel: +7 495 504 3405
Tel: +47 51 81 88 00
Tel: +1 713 334 2222
Tel: +971 4 811 8100
Asia Pacific
Australia
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West Africa
Tel:
Tel:
Tel:
Tel:
+60 3 2177 4450
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+55 212 222 1941
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