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MS2900L - CorrTran MV

LPR 4-20mA / HART® Transmitter

View data sheet (PDF)
User's Manual (PDF)
Instrinsic Safety Certifications
CorrTran Configuration Tool (download)
Device Descriptor files (download)
Metal Samples' CorrTran MV transmitter measures general corrosion, localized corrosion (pitting), and conductance, and transmits that information to operators via 4 to 20mA / HART® protocol in real time. The corrosion rate or pitting factor is configured as the primary variable using a standard 2-wire 4 to 20 mA output. The remaining outputs are configured as secondary and tertiary HART variables.

The CorrTran MV utilizes state-of-the-art algorithms and data analysis techniques to accurately measure general corrosion rate and pitting.  Harmonic distortion analysis (HDA) is applied to improve the performance of the industry-accepted linear polarization resistance (LPR) technique used to measure corrosion rate.

To further enhance the performance, an application-specific Stern-Geary variable (B value) is calculated and updated every measuring cycle. There is no need to manually update the B value because of process changes. During the measurement cycle, the CorrTran MV also performs an automated electrochemical noise (ECN) measurement, which in combination with the corrosion rate data can provide a measurement of localized corrosion (pitting).

The CorrTran MV works with Metal Samples three-electrode CorrTran style probes and electrodes.  Probes are available in a variety of mounting types and materials to suit almost any type of installation.

  • On-line corrosion monitoring, multivariable
  • 2-wire, 4 to 20 mA transmitter, HART interface
  • General corrosion, localized corrosion (pitting), and conductance monitoring via HART
  • Stern-Geary B value automatically updated for changes in the process

Technical Specifications

Model MS2900L CorrTran MV - LPR 4-20mA / HART® Transmitter
Physical Data
Instrument Weight: 1.1 lb (500 g)
Instrument Dimensions: 3.78” x 3.15” x 6.30” (96mm x 80mm x 160mm)
Operating Temperature: -40° to 158°F (-40° to 70°C)
Enclosure Material: Aluminum
Degree of Protection: IP66, NEMA 4X
Electrical Entry: ¾ NPT
Electrical Data  
Electrical Connection: 2-wire 4-20 mA with HART
Minimum terminal voltage: 11 V at 20 mA without alarm, or at 22.5 mA with alarm
Maximum terminal voltage: 30 V
Current Consumption: 4 to 22.5 mA
Maximum Load (at 24 V DC): 575 Ω with high alarm, or 650 Ω without high alarm
Terminal Assignments

2-wire connection with HART (DC)

Measurement Data  
Probe Type: 3-Electrode LPR        
Measurement Type: General Corrosion1   Localized Corrosion   Conductance
Measurement Unit: mpy (mils per year) or
mmpy (mm per year)
Unitless microSiemens (µS)
Measurement Range(s): Default Range:
0 to 40 mpy
(0 to 1 mmpy)
Default Range: 0.0 to 1.0
Low Range:  0.0 to 0.3
High Range: 0.3 to 1.0
5 to 333,333
  Maximum2: 1000 mpy
(25 mmpy)


  1 Instantaneous corrosion
rate available as a primary variable.  Average corrosion rate available via HART.
2 Range adjustable via
HART or factory set.
Maximum Measured Error: Excitation voltage < 0.05% of full span
Corrosion current measurement <0.2% of full span
Factory Settings: B value (Stern Geary value): 25.6 mV
K value (corrosion constant): 11800 (2e- in reaction)
Measurement Cycle: 4 to 21 minutes (depends on configuration)

Output Data  
Output Signal: 4-20 mA with HART protocol
Alarm Events: Alarm on over-range
Alarm Types: Digital and Analog (configurable)
Analog Alarm Options: Current high (22.5 mA) with auto-reset (default), current high with manual reset, or none
Output Damping: 0, 1, 2, 5, 10, 20, 50 s
Load: Minimum load for HART communication: 250 Ω
Certificates and Approvals
CSA Approval: cCSAus certified for USA and Canada; Certificate no. 1563164
IS: Cl. I, II, III; Div. 1, 2; Groups A-G
EX: Cl. I; Div. 1, 2; Groups A-D
NI: Cl. I, II, III; Div. 2; Groups A-G
Type of Protection:  II 1G EEx ia IIC T4
Patents: U.S. patents: 7,239,156; 7,245,132; 7,265,559; 7,282,928

MS2900L CorrTran MV Ordering Information

MS2900L - CorrTran MV - LPR 4-20mA / HART® Transmitter
Mounting Type
DM - Direct Mount
06 - Remote Mount with 6' (1.8m) Cable
12 - Remount Mount with 12' (3.6m) Cable
XX - Special (Remote Mount with XX' of Cable)
D2 - CSA, NI, CIass I, Div 2, Group A-D
Ex - Explosion/Flame Proof
GP - General Purpose
IS - CSA, IS, Class I, Div. 1, Group A-D  II 1G EEx ia IIC T4

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Metal Samples Company

P.O. Box 8
152 Metal Samples Rd.
Munford, AL 36268

: (256) 358-4202
Fax: (256) 358-4515

E-mail: msc@alspi.com

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