Ph Probe

[hammerhead]

I can not keep the PH probes in calibration I have 2 of them and 10 min after Cal they go way high. Is there a problem with the controller?

 

[clp]

After calibration do the probes read the 7.0 and 10.0 in the appropriate solutions (run display)? Do you have a serial cable plugged in? It could be ground loop. What type of controller?
What is the change in value that you are seeing?

Curt

 

[hammerhead]

This is on my ACJR. My cal solution has expired I ordered new 4,7,10. I will try it again with the new stuff