ph sensor?

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ph sensor?

Post by edfcmc » Wed Jan 08, 2003 1:06 am

Is there a linear PH sensor? Or a circuit that can be canabilized for a ph sensor?

Chris Foley
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Location: Chicago IL

Re: ph sensor?

Post by Chris Foley » Thu Jan 16, 2003 11:17 pm

Information on pH sensors and meters is available at Also, there is good technical reference material at the Omega Engineering site, at

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Re: ph sensor?

Post by Dimbulb » Sat Jan 18, 2003 10:52 pm

Really nice ph meter can be very hard to design.
An op-amp wheatstone bridge is carefully balanced stable by a reference voltage and compensated for thermal changes that cause errors both in circuit and probe also the output may not be linear requiring more compensation. I have wondered if a 12 bit a/d pic thermistor temperature kit could be modified so that a homemade ph probe would balance changing the bridge and letting the PIC software correct the errors.

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