My ph and temp calibration consistently drifts off within a couple weeks. I have replaced probes and the same thing happens. While a seperate ph monitor stays put, my ACII reading are of by +0.4. Recalibrating and probe cleaning haven't solved the problem yet.
If you have a serial cable plugged in, then I suspect a ground loop. Use an isolator (SERIPC9) if you are going to have the serial cable permanently plugged in your controller and PC.
Look at the datalogs in the AquaController and see if the drift is correlated w/ something turning on/off. If you can't find anything please give us a call 408-578-3022.
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