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CHT Thermocouple Probe Type?
Author: Matt Liknaitzky Reference Number: AA-00227 Views: 38116 Created: 2012-07-02 18:31 Last Updated: 2015-01-27 18:30 0 Rating/ Voters

Most Aviation CHT probes are either Type-K or Type-J thermocouples.

All CHT probes sold by MGL Avionics are Type-K. Many CHT probes available in the US are type-J. Please contact manufacturer to find out what type they are.

If you use the wrong type in your instrument setup, you will get inaccurate readings.

Type-K thermocouples normally have Red and Yellow wires.
Type-J thermocouples normally have Black and White wires.

Note that the polarity of Type-K Thermocouples is not intuitive, as Red is Negative:

TYPE-K (typical):

Note that the polarity of Type-J Thermocouples is not intuitive, as Black is often Positive:

TYPE-J (typical):

Read more about thermocouples here:


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