how to check thermocouple ,its working or not?
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Answer Posted / senthilnathan.j vizhidiyur
If you are going to test k-type thermocouple at normal room
temp.first you check the resistence of the themocouple using
multimeter.if junction is open then it shows Mohms means the
thermocouple is dead.it will show 0 resistence when it is in
good condition. then you check the milllivolt output by
touching the terminals with correct polarity (For k-type
red-positive; green-negative) using multimeter.at room
temprature the output of thermocouple is 0mV because both
the hot junction and cold junction are in same temprature
say 30deC.
then set the hotbath temp. into 100C and put the T/C inthat
and now check the T/C teminals it should show 4mV because
for K-type For 1degC =0.04mV will rise.It is difficult to
find that much minimum voltage.so that only we are taken the
reading at 100degC. now you are successfully tested the
Thermocouple.
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