Salinity Probe

[ecam]

Hello All,

I've been struggling with my salinity probe for that last few weeks. I calibrated using my tank water that is always at 35.0 as per two refractometers that I have. The problem is that when I calibrate it will hold for a week or so and then start to drift. (right now it is showing 31.6) My refractometer hasn't moved from 35.0 (i tested several water sources and the refractometer is accurate). I am about to setup top off based on salinity reading but cant really trust the probe. Can someone please advise on the best way to fix this problem.


Thanks

[Albe]

Have you checked for stray electricity in your tank? It could also be micobubbles getting caught at the bottom of the probe, if you give it a shake does the the values change?

[lnevo]

If you put the probe in a cup of tank water what does it read?

[ecam]

The reading stays the same... but the refractometer confirms my 35.00

No stray voltage from what i can tell

[lnevo]

Sounds like a bad probe...i know there were a few cases like this. Not sure what happened to address. I think Sacohen had the same issue.