It is usually completed with display instrument, recording instrument and electronic calculator and output 4-20mA to measure the temperature of liquid, gas and solid of carbon-chlorine compounds (-200℃-1300℃) on site.

 Thermoelectric power (resistance) of thermocouple (heat resistance) generated imbalance signal through temperature transmitter bridge and convert to 4-20mA DC electric signal by amplified then it pass the signal to working instrument which will display the temperature value.