we had this topic, decreasing conductivity reading over some time, in the German part of this forum, too
we contacted these customers directly to find out what is going on, the results were:
- electronics and firmware of ProfiLux 4 is 100% OK
- changing the probe - EVEN FROM OTHER MANUFACTURERS! - didn't change the situation, after a few days the value fell again
- and now the most interesting part: only tipping the probe very slightly (without removing the probe out of the water!) recovered immediately the correct reading
-> we assume that there are micro bubbles which have disappeared when touching the probe
one customer dislocated the probe a bit and it seems his problems had gone
I think the sensor should be somewhere where more flow is, to remove potential air
PS: Reading this thread may give the impression we would have here a general P4 or even GHL problem. This is NOT true.
We have here some cases, but on the other hand we have meanwhile > 1000 P4 users WITHOUT problems.
AND: we are using these probes UNCHANGED for many years now, it is not correct to say these probes had a general problem
-> please try the probe somewhere else - I am not sure which tactic is better: a place with less flow and maybe less bubbles or more flow which removes the bubbles
No support or warranty issues over PM! Please send PMs to the moderators only if you have general problems with using the forum! Thanks for helping us to keep the support efficient.
Kein Support oder Reklamationsabwicklung über PM! Bitte senden Sie an die Moderatoren nur PMs bei allgemeinen Problemen mit der Verwendung des Forums! Danke dass Sie uns dabei helfen, den Support effektiv zu gestalten.
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