pH probe going bad?

[Reefltx]

I have an apex controller with pH probe that's about 6 months old. I recently calibrated the probe about a week ago. I noticed today that the readings is jumping up & down (8.10,8.13,8.11).. Etc

I have it in the same chamber with my temp probe, ground probe, and chiller pump. I also noticed if I move it in a diff. Chamber in the sump, I get a very different reading.




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[redfishbluefish]

First thing I’d check is stray voltage. Make sure you unplug grounding probes, if you’re using them, before measuring stray voltage. Stray voltage will cause erratic reading of pH.


Second point, has the probe ever been submerged. pH probes cannot be submerged…it will ruin them.


Third point is that you might want to soak the probe in vinegar overnight, followed by a good rinse, and recalibration.

 

[Reefltx]

Okay, my brother suggested I test the probe by using a cup filled with tank water and placing the probe in it outside of the tank. Well, it fluctuated like before, but this time it gave me a high reading (8.88,8.99). It fluctuated every few secs or so, I'm guessing this confirms the probe is bad?


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