COSASCO Corrosion Measurement

Linear Polarization Resistance (LPR) 9020 Transmitter

The Model 9020 Linear Polarization Resistance (LPR) Transmitter is ideal for accurately monitoring corrosion rate in water systems ranging from high conductivity cooling water and seawater to low conductivity condensates. Power is supplied to the transmitter and the corrosion rate data obtained over a single pair of wires which facilitates installation and operation.

The 9020 LPR Transmitter (OEM module) can be mounted inside the CHEMTROL controller’ cabinet with 4‐20 mA connection. The Loop LPR Transmitter Module can be easily installed with an existing CHEMTROL system or tower controllers to provide continuous corrosion rate monitoring.

An independent second current loop provides the imbalance measurement which is a sample of Electrochemical Current Noise (ECN) between the electrodes. The ECN or imbalance current is related to pitting corrosion activity and inhibitor film stability.


  • Two-Wire Loop Powered
  • Continuous Corrosion Rate
  • Second Loop for Imbalance Measurement (Pitting)
  • Extended Operating Range

Linear Polarization Resistance (LPR) 9030 Transmitter

The 9030 Plus Linear Polarization Resistance Instrument is a corrosion rate system designed for cooling water, process water, and feed water systems. It is available with one or two channels of corrosion rate, imbalance, and temperature data for rapid response to process upset conditions.

Two‐channel operation allows for the monitoring of two alloys at a time, for example, mild steel and a copper‐based alloy (found in many plant systems).


  • Corrosion Rate, Imbalance and Temperature Measurements
  • Solution Resistance Compensation For Increased Operation Range
  • One or Two Channels
  • Data Logging and alerts via CHEMTROL remote monitoring module
  • Isolated 4-20 mA Outputs
  • Weatherproof Enclosure

Linear Polarization Resistance (LPR) Sensor

The Model 7012/7022 Linear Polarization Resistance probe provides a more rugged construction and is ideal for plant use in a bypass rack where removal under pressure is not required.

This probe employs two replaceable, identical electrodes which are mounted at the end of the probe by threaded, insulated studs. Two electrode probes are suitable for the majority of problems where LPR techniques are applicable. LPR probes are used by major companies worldwide to measure corrosion in water floods, cooling water loops and other aqueous systems and to provide control of inhibitor addition for optimum economy and corrosion protection. These probes may not be removed under system pressure.


  • Two Replaceable Electrodes
  • Mounting — 3/4″ NPT Adjustable
  • Temp. Rating — +300° F / +150° C
  • Pressure Rating — 500 PSI/3.4 Mpa
  • Electrode Seal Material:
    — Glass Reinforced Epoxy/Viton (Model 7012)
    — Glass/Viton (Model 7022)
  • Fill Material – Epoxy
  • Body Material – Stainless Steel

Probe Dimensions