Selection of thermocouples for measuring boiler flue gas temperature
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We have a project that requires measuring the outlet temperature of flue gas; the temperature of the flue gas is approximately 120–180°C. We would like to know which type of thermocouple would be suitable, as well as the most appropriate installation method. The signal output is required to be a 4-20mA signal
At temperatures of 120–180°C, it is not necessary to use thermocouples; a thermal resistor will suffice. The output from a temperature transmitter equipped with a thermal resistor is 4–20mA, and it can be installed using M27*2 threaded fasteners.
I think a model with a wear-resistant sleeve should be chosen; either thermocouples or thermal resistors can be used. To achieve a 4-20MA output, a transmitter is necessary, and it should be installed on the flue using flanges.
A regular integrated one will do
Thermocouples can’t be used; the temperature is too low. An integrated thermal resistor (with a temperature transmitter) can be used, taking threaded installation into consideration.
Thank you to the people above for their help. Are thermal resistors cheaper than thermocouples?
Thermoresistors are cheaper than thermocouples, and they also do not require compensation wires
I thought it was 1000℃. . . It’s just over 100 degrees, so a PT100 temperature transmitter will suffice