View Full Version : What Would Cause This Strange pH Behavior

07/29/2008, 11:29 AM
Is this sign of probe going bad? Nothing died, probe is still where it always was. Probe is only about two months old.


07/29/2008, 11:55 AM
Looks suspicious, as though the calibration was suddenly reset.

Do you have any 7.0 or 10.0 on hand?

07/29/2008, 12:30 PM
Possibly a ground loop. Make sure that an isolator is installed if you are using the serial port on the controller. Also make sure that any of the digital inputs are electrically isolated from the water.


07/29/2008, 12:52 PM
I'm not using the serial port, and there is no reason the inputs would have gotten wet since I did nothing, and there's a mini-din plugged into the port as it is.

07/29/2008, 12:56 PM
Some float switches fail, and begin to leak water. It is worth checking.


08/04/2008, 11:42 AM
I think I figured out what happened. I had gas build-up in my calcium reactor, so I opened up the outlet drip-control valve to allow max flow out of the reactor so as to purge the build-up. Very low-pH effluent dropped the system pH almost immediately. . . . . duh!