The Trend T/FGS Flue Gas Sensor is a duct mounted PRT sensor for high temperature monitoring applications up to 400 ?C (752 ?F). The Trend T/FGS Flue Gas Sensors Electronics is housed in a separate box which produces a 4 to 20 mA output signal. The Trend T/FGS Flue Gas Sensor has a 1/8? BSPT compression fitting which allows the probe depth to be varied. The Trend T/FGS Flue Gas Sensor is supplied complete with brass mounting flange for thin wall duct applications.