Walchem 191935-20 LPR Corrosion Sensor with 20' Cable

Linear polarization resistance (LPR) is an electrochemical technique used to monitor corrosion in several industrial systems, piping, cooling towers, and more that are exposed to the flow of conductive water. This is done with LPR corrosion probes or sensors, which measure the rate of corrosion. Walchem offers LPR sensor input/output cards in equipment capable of feeding chemicals for corrosion control, especially in cooling towers. The electrodes used on these sensors must be the same material as those in the system.

Features:

• Reliable 4-wire design
• Corrosion Rate and Imbalance
• Dual corrosion sensor input
• Automatically measures conductivity and compensates for it each cycle
• Able to set a control delay during the initial stabilization time
• Automatic electrode replacement reminder
• Disturbance Control Algorithms that take advantage of the corrosion signal
  • Target PPM mode with Disturbance
  • Adjusts the target PPM higher if corrosion increases
• On/Off Disturbance mode
  • Adjusts the target PPM higher if corrosion increases

Linear polarization or plane polarization occurs when an electromagnetic wave propagates in the same plane in a single direction. The resistance to this polarization is used to measure corrosion rate with the help of these probes. The probes use the LPR technique to measure corrosion resistance, wherein voltage is applied to the electrodes. They are scanned considering a certain range which may be from 0-2 mm/year to 0-200 mm per year. The voltage produces current which is used for calculating polarization resistance. This resistance is inversely proportional to corrosion rate. Hence, if the polarization resistance is low, the corrosion rate is high.

For more information, please see Data Sheet