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Temperature controller protection


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We are using temperature controllers to control temperature

of a sealing jaw for our packing machine. The sensor is a J type thermocouple placed on the body od the jaw. This controller controls the temperature by putting the heater ON and OFF.


Whenever heater is shorting to body we loose the controller as it gets effected by the heater grounding. Is there any way we can isolate this stray voltage reaching the controller through the thermocouple and spoiling the controller ?


any other advise on this issue is welcome.





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