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ph sensor?
Posted: Wed Jan 08, 2003 1:06 am
by edfcmc
Is there a linear PH sensor? Or a circuit that can be canabilized for a ph sensor?
Re: ph sensor?
Posted: Thu Jan 16, 2003 11:17 pm
by Chris Foley
Information on pH sensors and meters is available at
www.omega.com. Also, there is good technical reference material at the Omega Engineering site, at
http://www.omega.com/techref/
Re: ph sensor?
Posted: Sat Jan 18, 2003 10:52 pm
by Dimbulb
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.