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Thermowell oil
Type of Thermowell oil

Hi! everybody
actually i want to know which type of we use in thermowell?

[mods note: I think he means to say, "actually i want to know which type of oil we use in thermowell?"]

and what happen if we were not using any oil in thermowell?Is thermocouple in problem?

First, if you want to use oil make sure the wells are not mounted sideways. ;^)

Oil is used to accelerate response time in low temp applications. Mobil 1 is fine.

If you are going > 200C I would not recommend using oil as it will eventually gunk up and cause problems with response time and may cause your probe to stick in the well.

If you have a spring loaded 1/4" probe inside a .260 bore well, you usually do not need to resort to oil. You may want to try a step shank as the response time there will typically be better than tapered or straight.