MS2500L Loop-Powered LPR Transmitter

Probe shown in photo not included with corrosion transmitter

The MS2500L is a corrosion transmitter capable of measuring and transmitting data from all types of 3-electrode linear polarization resistance (LPR) corrosion probes.

Corrosion rate measurements are made using the linear polarization resistance technique. The instrument measures the current required to polarize the electrodes of a probe to a known potential. From the polarization potential and the measured current, polarization resistance can be calculated. Then, using Faraday’s law, instantaneous corrosion rate is calculated from polarization resistance.

Another feature of the MS2500L is its high-precision voltmeter. This is used to measure the open-circuit potential between electrodes.

Measurements are transmitted via 4-20mA current loop. Since current loop signals are not as sensitive to line loss as other types of data signals, the MS2500L may be located up to ten miles away from the data receiver under proper conditions.

The MS2500L is completely loop-powered, so installation is simple. A two-wire connection is all that is required for both instrument power and data transmission. Setup is also simple, using a set of switches to select the measurement function (corrosion rate or electrode potential).

The MS2500L is housed in a NEMA rated explosion-proof and weather-proof enclosure, and the probe cable is connected through a water-tight, explosion-proof cable gland. This makes the MS2500L suitable for use in almost any indoor or outdoor environment.

Technical Specifications

MS2500L - Loop-Powered LPR Transmitter (Ordering # IN2500L)


Physical Data
Instrument Weight: 5.02 lb. (2.28 Kg)
Total Weight w/ Accessories: 7.08 lb. (3.21 Kg)
Instrument Dimensions: 5.81" H x 4.5" W x 4.81" D (14.76cm x 11.43cm x 12.22cm)
Case Specifications: Explosion Proof (FM, CSA, CENELEC, UL)
Class I, Groups B, C, D, Class II, Groups E, F, G, Class III,
Mounting Specifications: 0.728" H x 1.756" W (1.85cm x 4.46cm) Bolt Pattern with 1/4-20 Tapped Mounting Holes, or may be mounted on a 1/2" to 2" (1.27cm to 5.08cm) pipe using supplied hardware
Operating Temperature: 32 to 158F (0 to 70C)
Storage Temperature: 32 to 158F (0 to 70C)


Performance Data
Measurement Type: 3-electrode LPR, Potential
Range: 3-electrode: 0-100 mpy  Potential: 1V
Cycle Time: 0.1 to 99.9 minutes


Electrical Data
Power Requirements: 11 to 35 VDC
Maximum Probe Cable Distance: 10 ft. (3.05 m)
Output Specifications: 4-20 mA Current Loop Output


Special Features
  • Switch selectable measurement type and cycle time
  • Loop powered


Accessory Items
10' Probe Cable (attached), Meter Prover, Mounting Hardware, Operation Manual


MS2500 Wireless Radio Option

Accessory Items

5' Probe Cable (attached), Meter Prover, Mounting Hardware, Operation Manual

The integrated wireless radio and I/O module eliminates cable and conduit used by the standard 4-20 mA current loop version of the MS2500E/MS2500L, making it better equipped for harsh industrial environments. The wireless radio utilizes 900-928 MHz ISM band spread spectrum, frequency-hopping technology to guarantee a license free, interference free link between remote devices and the control room.

Costly cable and conduit runs on new projects, or retrofitting of existing systems, are eliminated and replaced with a maintenance free, reliable and versatile wireless solution.

The set consists of an outdoor transmitter, receiver, and two antennas.


Features of the Wireless Radio

Interference free, frequency-hopping, spread spectrum technology

License free 900-928 MHz band

Easy to use, wire in/wire out, no setup or programming

180-300 m (600 to 1000 ft.) range in plant without line of sight with included antennas

Range with optional omni-directional antenna --- receiver and transmitter = 6-8 km (4-5 mi.)


Electrical Data

Power Requirements: 12 to 35 VDC

Intrinsic Safety: Class I, Division 2 approved for hazardous area


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Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


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