pH_PROBE_AND_DETECTOR

Published:2009/7/9 20:50:00 Author:May | From:SeekIC

The greatest sensitivityis achieved if R1 is approximately equal to the probe resistance．The circuitcan be zeroed with R2,while the full-scale voltage is controlled by R5. The correlation between pH andoutput voltage might not be linear, which would necessitate a shaping circuit. A calibration scheme, using solutions of known pH, might prove adequate and more reliable over a period of time because of probe vanance.



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