TConnolly
Lifetime Supporting Member
Better yet two (now that you can break one you wont).
QFT! Funny how that happens isn't it? If you do not have a spare you'll almost certainly need one. If you do have a spare you most probably won't need it.
We used to have a process that used hydrofluoric acid. HF acid is some seriously dangerous stuff, it is easily absorbed through the skin and then it hangs around and messes with blood and bone chemistry. We found another way and ditched that potion.
I'll second Dan's suggestion - check the calibrator with a thermometer first in a neutral liquid, I suggest just plain water.
Is the acid bath part of an electrochemical process (plating, deplating, etching, etc)? Is the first check made before start of a batch and the second check made later after the current is switched on? If so then switch the current off for a few seconds if your process can tolerate it and check to see if there is a small but noticeable change in the RTD reading when the current is off. If the reading changes you might have a ground loop or an isolation problem with the RTD probes so that there is a common mode voltage noise problem on the RTD elements.
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