Thermocouple, RTD Sensor, PT100 Sensor 1.used for applications that need liquid tight. 2. ... probe body is made of stainless Thermocouple, RTD Sensor, PT100 Sensor:This Pt100 RTD temperature sensor is used for applications that need ... , 1/8" NPT. Maximum temperature, 420C. Thermocouple Probe, k types , pt100