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I am working with controlling an exhaust scrubber which is handling HCl fumes from an etching process. I would like to know how others are controlling their scrubbers to achieve neutral pH in their exhaust stream. More specifically, where is the best place to locate the pH probe? Is more than one sensor needed?
The pH probe is currently located in the scrubber itself. The measured pH levels drop rapidly (from ~8.0 to ~3.0 in the space of 4 or 5 seconds).
These drops appear even as we are pumping caustic solution into the wash stream. Eventually the system responds and the pH rises up to ~12.0 and
stabilizes for a period of time before dropping back down again. I have been told that the exhaust fumes come in a steady stream with no surges.
Thanks in advance,
Ron Davis
[email protected]
The pH probe is currently located in the scrubber itself. The measured pH levels drop rapidly (from ~8.0 to ~3.0 in the space of 4 or 5 seconds).
These drops appear even as we are pumping caustic solution into the wash stream. Eventually the system responds and the pH rises up to ~12.0 and
stabilizes for a period of time before dropping back down again. I have been told that the exhaust fumes come in a steady stream with no surges.
Thanks in advance,
Ron Davis
[email protected]