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Temperature Control Problem

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Making furnace temperature control application using V350-35-TR20, Type K thermocouple ( omega KQXL-116G-9 ) input to IO-ATC8 module.

Temperature/process value jumps dramatically every time power is applied to heating elements, up to 100° at higher temps. When power is removed

temp returns to accurate reading as verified by other controllers.

Using type K shielded cable, have tried grounding shielding to furnace or at other end in box. Have many other furnaces wired in similar fashion to

stand alone temperature controllers without this issue.


Any Thoughts?

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