Ph probe experience

[AlexR]

I just recently started using a Ph probe attached to a controller.

It's been nothing but a headache for me...

First I can't get the calibration right and when I start to think it's ok the readings go out of wack...

Now I can't get the probe to read at all while in the DT or refugium. It's reading 0 as soon as it touches my tank water. It reads when in the calibration solution. It reads when it's in a cup of tank water.
Soon as it touches tank water it's back to zero.

I have tested for stray current and I have no issues there. I have even tried unplugging everything and testing the probe, same results.

Does anyone know why this is happening? Faulty probe? Makes no sense to me.

 

[Rafty]

Sounds like a faulty probe. Have you contacted manufacturer of probe?


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[otimer]

That's exacrly same with my problem.
I've rectified it with rerouting the probe cable sagregating from AC cables and attaching ferrite cores on all related cables.

As far as I understad electrical noise interferes with the very low voltage signal from the probe.
The electrical noise has very low power. Accordingly it cannot be measured by a standard multimeter. It only can be measureed by a osciloscope or an electrical noise analyzer.
You'd rather consult with an electrical/electronic engineer who is specialized in troubkeshooting electrical noise problem.