Processing Magazine

Online Corrosion Monitoring Transmitter with WirelessHART

February 18, 2010

CorrTran® MV Corrosion Detection Transmitters that deliver multivariable outputs — including general and local corrosion rates and conductivity from a single transmitter – can now deliver that information wirelessly via the WirelessHART protocol. This unique functionality enables users to determine the effectiveness of their corrosion inhibitors, and to detect and correct corrosion issues through upkeep and preventative maintenance, before they become a costly problem. Both WirelessHART and standard HART model CorrTran MV transmitters use a new algorithm of the LPR (Linear Polarization Resistance), HDA (Harmonic Distortion Analysis) and ECN (ElectroChemical Noise) measurement for maximum corrosion monitoring accuracy. They also automatically calculate and update the Stern-Geary value (B-value) due to changes in other process variables to maintain maximum accuracy. At the completion of each measurement cycle, the respective corrosion rate and pitting value is calculated and made available to the plant personnel in the form of a 4-20 mA HART signal.