View Full Version : Determining if a pH probe needs to be replaced
I've got a Apex setup with a pH probe and just wondering how to tell when a pH probe needs to be replaced?
What are the signs?
Is it normal for the pH to change throughout the day?
What is an acceptable range?
Thank you!
WarDog
03-29-2018, 05:02 AM
I had my pH fluctuate from 7.8 to 8.4 sometimes throughout a day. If you're really concerned, get some calibration fluid and re-calibrate.
Warren,
Thanks for the quick response! :biggrin:
I just replaced my pH probe and calibrated on Tuesday. The pH peaked at 8.43 with a low of 8.33.
Would you know what the typical pH swing should be?
I just set TEMP COMP = ON for my Apex. Perhaps this will provide me with a more stable reading.
Galizio
03-30-2018, 02:15 AM
When I talked with a Neptune rep, he told me a regular ph probe should be replaced every year, a bit longer with a lab grade one.
I been using the same probe for 3+ year and only had to recalibrate a couple of time
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Bryan
04-01-2018, 09:02 PM
Usually a good sign of a probe that is low quality or needs replacing is how fast it reacts to pH changes. If you stick it in a calibration fluid and it takes forever to stabilize it's probably past it's best before date. Although that doesn't necessarily mean it is inaccurate once calibrated.
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