A field trial of electrochemical corrosion rate sensors was conducted over a five month period to
monitor fireside corrosion in a waste to energy (WTE) plant. The unique 3-electrode air-cooled
corrosion sensors, each including a thermocouple to monitor sensor temperature, were installed in four
different ports at approximately the same level of the WTE boiler. A total of twelve sensors were tested,
six with electrodes using the carbon steel boiler tube material, and six using the nickel-chromium weld
overlay alloy for the electrodes. Corrosion rates and temperatures of the sensors were monitored
continuously through the trial. Measurements of sensor thickness loss were used to calibrate the
electrochemical corrosion rates.