Hello,
I'd like to expand a question raised by David Albone (LMP91200 pH sensor diagnostics). I too want to use the diagnostic feature of LMP91200. I'd like to ask what are the typical response times of a good pH probe. At least, what are the ranges we are talking about. Let's say the response is a simple RC-type transient response so assume we are looking at the "apparent" time constant. In a good pH probe, would this be a millisecond, tens of milliseconds, faster, slower? And an old pH probe, how much would it differ from a new probe? Ten times slower, thousand times slower?
I know that David Albone asked whether a 125 SPS ADC would be enough to diagnose and got answer by Domenico Granozio that a 1kSPS would be better. So, are we talking milliseconds? Also, is the RC response the likely type of response to the diagnostic function?
Thank you very much for answer
Jakub Polonsky
University of Chemistry and Technology Prague