Hi
I can't find any errors in our test systems in regards to salinity. We also have meanwhile several hundred of new P4 owners, I doubt that there is a system error.
The values in our test systems are plausible and without significant drifting.
The hardware and firmware parts of the conductivity measurement (incl. temp. compensation) are practically the same as found in the P3, and the P3 is working fine for over 9 years now ...
The conductivity measurement is extremely depending on a correct temperature measurement for the compensation, maybe there is the reason.
The temp. during the calibration must be 100% correct (best way to do so: have the calibration fluid bottle floating in your tank for a few hours so it has the same temp. as the tank water).
Later the cond. probe must be very close to the temp. probe during operation.
Maybe calibrate again.
You can "reset" the downward drifting by pulling the conductivity probe out of the water for a second and putting it back in. When I do this, it resets the downward drifting effect.
I have no logical explanation for this. The probe just measures the resistance of the water between 2 electrodes, nothing else.
If you remove the probe out of the tank the probe temp. will change.
Or maybe moving the probe eliminated coincidentally the real problem, like air, algaes, snails, ...
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