Trouble Calibrating PH Probe

[rodric]

I didn't notice this in the forum, forgive me if its already discussed somewhere.

I calibrate the probe and get normal numbers.

Ph 7.0 531
Ph 10.0 839

After calibration, the probe does read very close to 10.0 in the 10.0 solution. Then I reboot. PH shows super low and the calibration numbers go to 0.

I have tried this with default in-memory and in-code settings.

Suggestions?

[rimai]

Those numbers look correct values.
It only does when you reboot?
If you don't reboot, does the reading look correct?

[rodric]

Unplugged cloud wifi
Ph 7.0 445 <OK>
Ph 10.0 757 <OK>
Ph reads 10.0
Rinse in Distilled Water
Put in tank, waited…now reading 2.69!
Went back to calibrate - reads 0

[rimai]

What happens if you place in a cup with tank water?

[rodric]

Good call Roberto! I just did it and the PH is 7.68 and stabilizing. It didn't even dawn on me to try when I saw the calibration number show up as a 0.

Do you suspect its stray voltage? I am going to try unplugging everything then plugging them in one at time.

[rodric]

With everything but the reef angel unplugged I'm getting the same: doesn't work in tank. Works in cup.

[rimai]

That is what it looks like. Stray voltage somewhere.

[rodric]

With absolutely everything unplugged it continues though. Have you ever encountered that?

[rodric]

Does anyone have any other suggestions? With nothing plugged in, the problem persists. What could be causing it?

Thank you,

Rodric

[rimai]

So, there is no electical part connected to any outlet?
What about the float switches?

[rodric]

That's with absolutely nothing plugged in! I don't have float valves installed yet.

[rimai]

That doesn't make sense.
Something is grounding the water.
Are you sure you don't have any pump plugged in. Even the ones not connected to RA?

[rodric]

That's correct, no electrical part whatsoever.

[Civics14]

My temp probe goes bad and does this to me. Have you checked that?