Thermocouples can be carefully removed and polished clean with #00 steel wool.
You do NOT clean a thermocouple. They are really inexpensive and when they are giving problems have a LMP / or Gas fitter replace it
It's not necessary to clean it. If by any chance you have a problem and THINK you need to clean it, it's more likely the thermocouple is acting up and needs to be replaced.
Control valves do go bad, but not that often. The tip of the thermocouple is in the flame? Holding the pilot button down long enough for it to heat? Sometimes the first time you light it, it takes a little longer for the thermocouple to work. Good clean connection on the valve end of the thermocouple? That's all I can come up with at the moment.
The output of the thermocouple is linear.
Yes, thermocouple is used in fridges !
To create a thermocouple one needs thermocouple wire, a means of spot welding the wire, and wire strippers. A thermocouple is used to measure temperature.
The thermocouple keeps a gas pilot light burning.
is a thermocouple an active or passive transducer?-why?
You should not paint a thermocouple.
Remove the pilot assembly from the furnace and clean it up. You need to be careful when putting it back on at the gas valve so as not to crossthread the screw. Take a thin wire and clean the pilot orifice, then use a brush or sandpaper on the thermocouple.
not much, but it will depend on the type of thermocouple
Yes, it's an active transducer. A thermocouple is passive not active