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Subject: corroded thermocouples - how to clean?

Date: 08/29/00 at 3:53 AM
Posted by: Ivo
E-mail: offentha@edv1.boku.ac.at
Message Posted:

Hi,
I use humidity sensors which have type E (chromel/constantan) thermocouples. Wires are extremely thin.
After repeated measurements, the TC junction becomes contaminated/corroded which considerably decreases
accuracy of the measurement. I tried cleaning the metal surface with different substances (5% ammonia solution,
acetone/ethanoleum mixture, chloroforme) and ultrasonification but neither method works
satisfactorily.
Do you know of more efficient ways to restore thermocouples? Any advice would be great.
Ivo

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