In article ,
"Ralph Mowery" wrote:

"Smitty Two" wrote in message
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In article ,
mike wrote:

Can't answer your question. But I do know something about thermocouples.
Those designed to measure air, and surfaces, and liquids, are different.
Hope you have/use the correct probe for your application.

They are not really that different. They are just made out of two different
kinds of wire/materials and are joined together at the very end of the
probe. The only difference is in the mechanical makeup of the probe. The
very tip where the wires are joined together is the only point that is being
measured.

At work we use hundreds of them, maybe thousands. They are used in air,
nitrogen, direct contact and in other materials. The same ones are used in
all applications that are within the range of the J type or K type. We use
them from about -20 deg C to + 500 deg C.

You can even just take the connecting wire and twist it together and get a
close measurement where they are shorted together. The wire is usually made
out of the same material as in the thermocouple.

The difference in probes for different applications isn't in the
junction, as you note. It's in the way the construction of the probe
ensures the best possible sensing of the test article. A standard liquid
probe taped to a surface will sense 1/2 surface and 1/2 ambient temp.
Not exactly conducive to accuracy.