Ph-probe-and-detector  

Category:
Medical Circuits
Added on
Nov 15, 2012
The greatest sensitivity is achieved if R1 is approximately equal to the probe resistance. The circuit can be zeroed with R2, while the full-scale voltage is controlled by R5. The correlation between pH and output voltage might not be linear, which would necessitate a shaping circuit.
Ph-probe-and-detector - schematic

A calibration scheme, using solutions of known pH, might prove adequate and more reliable over a period of time because of probe variance.




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