I want to test a thermocouple loop by injecting a millivoltage from the field where the thermocouple terminates in its compensating cable back to a substation and a thermocouple/mA converter card with cold junction compensation. Let's say the field is 30 degrees Celsius and the substation is 10 degrees Celsius.
Expert’s answer: How to use thermocouple basics to test a thermocouple loop
Piece of cake! This goes all the way back to thermocouple basics. Come, children. Let’s have our lesson for the day.
Now, you’ll need to sum up the millivolts (mV) for each temp that you have from the sensor to the input card. The temp where you have the card will also come into play here, so get that too.
When you’ve corralled all these numbers, you’ll find that your error margin is minimal most of the time. Take a look at this handy-dandy pic to give you a better idea of what you need to do!
These guys have temp transmitters:
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