Ph-probe-and-detector


Posted on Nov 15, 2012    6555

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
Click here to download the full size of the above Circuit.

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




Leave Comment

characters left:

New Circuits

.

 



Top