A thermocouple is a temperature-measuring device consisting of two dissimilar conductors that contact each other at one or more spots. It produces a voltage when the temperature of one of the spots differs from the reference temperature at other parts of the circuit. Thermocouples are a widely used type of temperature sensorfor measurement and control,and can also convert a temperature gradient into electricity. Commercial thermocouples are inexpensive,interchangeable, are supplied with standard connectors, and can measure a wide range of temperatures. In contrast to most other methods of temperature measurement, thermocouples are self powered and require no external form of excitation.

Conductor Model Type Use temperature°C
(short time) Use temperature°C
(long time)
Ni-Cr / Ni-Si WRKK K 0-1200°C 0-900°C
Ni-Cr-Si / Ni-Cr-Mg WRKN N 0-1000°C 0-1000°C
Ni-Cr / Ni-Cu WRKE E 0-700°C 0-600°C
Fe / Cu-Ni WRKJ J 0-600°C 0-500°C
Cu / Cu-Ni WRKT T 0-400°C 0-350°C
Pt-Rh10 / Pt WRKS S 0-1600°C 0-1300°C
Pt-Rh13 / Pt WRKR R 0-1600°C 0-1300°C
Pt-Rh30 / Pt6 WRKB B 0-1800°C 0-1600°C

Classification Type Standard Model Features Temperature Material Use Requirement
Resistance C WZP Special 0~2300ºC W/Re Vacuum field
PT10 WZP Normal -200~650ºC Pt Stable
PT100 WZP Normal -200~650ºC Pt With Different Range
PT1000 WZP Normal -200~650ºC Pt
Cu50 WZC Normal -50~100ºC Cu
Cu100 WZC Normal -50~100ºC Cu
PT500 WZP Special -200~650ºC Pt
PT200 WZP -200~650ºC Pt
Thermistor NTC Low Accurcy