PH on Apex bumps up every time chiller runs

[schuby]

I've tried calibrating my PH probe with Temperature Compensation enabled and disabled. Both ways I get the same result you see in my screen-shot: PH goes up temporarily when the chiller drops the temp. When the chiller turns off, PH goes back to about where it was before.

Does this happen for anybody else?

 

[Breadman03]

That looks like electrical interference. Try cycling it on/off a few times manually. And note that the pH probably “switches” by the same amount each time.

 

[schuby]

Thanks. I'll check to see if re-routing the PH probe cable makes a difference.