Thomson turbine inlet temperature gauge for an airplane test

Thomson turbine inlet temperature gauge for an airplane. This is a first test... I applied a sine wave signal of 2,5...39,4mV to the thermocouple input to simulate the temperature rise and fall.

Panel illumination:
A (red) is the illumination common.
B (white) and H (white) are the illumination signals.
28V (50mA) on B-H works fine. B and H can also be connected together to 12V and A to 12V return for redundancy.

Power input:
C (red) is +28VDC (240mA) power input.
D (blue) is the 28VDC power return.

K-type thermocouple input:
E (red) positive.
F (yellow) negative.is the K thermocouple input.

Instead of a thermocouple sensor a small voltage may be applied for meter deflection. I measured the following results:
100'C = 2,5mV
200'C = 6,5mV
300'C = 10,6mV
400'C = 14,8mV
500'C = 19,1mV
600'C = 23,4mV
700'C = 27,6mV
800'C = 31,8mV
900'C = 35,8mV
1000'C = 39,4mV

J (black) is unknown.
G and K are not connected.

The experiments and findings are inspired on the video of Michel: https://youtu.be/KZBvdugyShA.

Видео Thomson turbine inlet temperature gauge for an airplane test канала polytech_nu