What is thermocouple cold junction compensation analysis _ instrument
Due to the thermocouple materials are generally more expensive (
Especially when using precious metals)
And temperature measuring points are far away the distance to the instrument, in order to save thermocouple materials, reduce cost, usually adopt the compensating conductor (of the cold junction of the thermocouple
The free end)
Reaches to the relatively stable control indoor temperature and connected to the meter terminals.
It must be pointed out that the role of the thermocouple compensation wire only extend thermal electrode, make moves to the control room of the cold junction of the thermocouple meter terminal, it itself does not eliminate the cold end temperature change on the influence of temperature, no compensation.
Has not used the thermocouple should pay attention to two points, one is the test precision, but the thermocouple note also that the insulation is enough?
So, still need other correction method is used to compensate the cold end temperature t0 indicates influence on measuring temperature 0 ℃.
Must pay attention to when using thermocouple compensating conductor model match, cannot be wrong polarity, compensation conductor should be connected to the thermocouple temperature should not exceed 100 ℃.