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Quick update Matthias, the grounded PSU has fixed this.

Ok, thanks, I'll wait to get a new PSU and report back.

Thanks Matthias, just a thought, does the new PSU actually ground the Profilux, or is it just the PSU that's grounded?

An old thread of mine but one that is still causing me headaches, lol.

But, I was browsing though some other threads and came across this....



I have found that by grounding my Profilux, not...

Yes, correct,

I have measured the voltage in the water with a multimeter with the pH & ORP probes out of the water and get a zero reading, with either probe in the water I get a reading, I take it...

Yes, the lights are off and unplugged, still the same.

Hi Matthias, I don't believe it is the source, with everything switched off and unplugged the problem is still apparent.

For info I have a PIII, 3 pump doser, 6 socket digi plug bar (connected to...

Although the value increases the reading doesn't fully stabilise, I see an increase in the ORP value when the plug bar is disconnected.



I've now tried the above and the problem still persists....

Ok, so my ORP reading is fluctuating wildly, in a mug of tank water though it is stable and accurate.(reads 290 ish)

What have I tried so far................

Tank water earthed through a...