Patent ID: 7245132

Claim:
A loop-powered corrosion measurement device for measuring or monitoring corrosion of a structure exposed to an electrolyte, comprising: a loop interface comprising a power conversion system to convert power from a 4-20 mA loop to power the device; a probe interface system with signal conditioning circuitry to interface with a plurality of measurement electrodes situated in the electrolyte, the signal conditioning circuitry comprising: excitation circuitry operative to provide excitation signals to the electrolyte via a first one of the electrodes, and sensing circuitry operative to sense one or more corrosion-related electrical signals via at least a second one of the electrodes; a processing system operatively coupled with the probe interface system to control the excitation signals provided to the electrolyte and to compute at least one corrosion related value based on signals sensed by the sensing circuitry; and an isolation barrier providing galvanic isolation of the electrodes from the 4-20 mA loop.