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GuyB

weird thermocouple behavior after a certain temperature

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Hey all,

i have a friend with an application where he has a "black box" which is comprised of a heater and a thermocouple (4 wires coming out in total).

he's using a B&R digital output module to turn the heater on (i.e. give it 24V) and a thermocouple module to read the temperature from the TC sensor.

with one of these "black boxes" he has encountered a strange phenomenon - once the reading from the thermocouple reaches a certain temperature (and the digital output giving power to the heater from that same "black box" is still on), instead of climbing, the temperature reading begins to drop. Once the output from that same "black box" is turned off - the temperature reading jumps to what it was supposed to show if it hadn't dropped.

other than a defective sensor ("black box" was changed and the phenomenon stayed), do you have any other explanation for why this would happen?

 

Thanks.

 

 

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