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In chemistry, pH is a measure of the activity of the (solvated) hydrogen ion. Pure water has a pH very close to 7 at 25°C. Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline.

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I've recently set up a small circuit for PH measurement using a BNC PH electrode. A picture of my circuit can be seen below: The linear reference REF1 alongside opamp U1A serve to generate a 2.5V … circuit was varying (some noise is always expected so this didn't worry me so much). However even with the software filter, my PH readings will tend to slowly drift around. For example, if I put it into a …
asked Sep 27 '18 by Platytude
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Late answer, but I figured I should post here for posterity's sake. The problem was solved by placing RC filters at the output of U1B, and before the positive input of U1A. The drift appears to have b …
answered Nov 1 '18 by Platytude