For a simple pH circuit can be found here http://discusforums.com/forum/viewtopic.php?t=12582&postdays=0&postorder=asc&&start=40
I have built this cct and also provided some tips in the last thread page. Works OK however it is not temperature compensated. In aquariums the temperature is stable +-1~2 degrees so no real need. Depends on what you are trying to do. You could always do compensation within a simple script when reading the data.
rob
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