CMD1747513 PT 100 Thermocouple 200mm Length 6mm Diameter. These temperature probe assemblies are all constructed using a stainless steel sheath containing either a J or K type thermocouple or a P100 RTD sensor element. The aluminium head contains a programmable 4-20mA transmitter which, although pre-programmed for the standard temperature range of the sensor can be changed by the user so that the 4-20mA output corresponds to any temperature range within the sensors’ capabilities.