Reference Thermocouple Probe (TRP) Calibration

M

Mike Boothe

#1
#1
Reference Thermocouples are constructed from Thermocouple wires and copper wires. These junctions are insulated from each other and immersed into an Ice Bath so that mV values from a precision dc voltage source can be used to simulate a Thermocouple value.

Omega Engineering makes several Thermocouple Reference Probes (TRP) that are very convient for this task. My question is what is the best way to accurately check them (performance verification)?
 
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BradM

BradM

Leader
Admin
#2
#2
Mike, it sounds like you are pretty well down the path already.:agree1: The best method I have found is to purchase a calibration dry block from a reputable dealer. Hart Scientific makes awfully good equipment.

Depending on how many ranges you verify, you might have to buy more than one dry block, as there is not magical piece of equipment. :D

With thermocouples, if you are going to read millivolt signals, you will need to compensate (or null out in an ice bath) the cold junction compensator.
 
Jerry Eldred

Jerry Eldred

Forum Moderator
Super Moderator
#4
#4
I've done them using GIDEP procedures. I'll have to go look to verify. But I believe it involves putting everything in an ice bath and verifying the mV output on the copper side is zero plus or minus a tolerance with the cold junction and the thermocouple side at zero. It may be later today or tomorrow before I'll be able to look it up.
 
M

Mike Boothe

#5
#5
I've tried this method numerous times. You have to twist the thermocouple wires together and put this new thermocouple junction into the Ice Bath. I got varying results based on how well the thermocouple junction mechanical connection was made.

Is this an acceptable practice?
 
F

fast_hedgehog

#6
#6
I have asked this question to so many people, and have never got a satisfactory answer...

The reference junction in the ice bath is itself a thermocouple junction, but no one seems to think they need verifying. Hopefully someone can help!
 
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