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Old 01-31-2019, 11:44 AM   #1 (permalink)
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Default Regarding pH Meters

I recently purchased a pH meter and have run into a problem. The response time to reach a final reading in 4 of my aquariums is about 7 or 8 seconds. In the fifth the response time can vary from 24 to 60 seconds. After contacting the manufacturer I recalibrated the meter, which it did not need since I checked it in buffer solutions prior to recalibrating, and still have the same problem. The only difference I can think of between the group of 4 and the other one is that the one has CO2 injection while the others do not. Any thoughts?
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Old 02-01-2019, 05:44 PM   #2 (permalink)
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Default Re: Regarding pH Meters

make and model?
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Old 02-02-2019, 04:25 PM   #3 (permalink)
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Default Re: Regarding pH Meters

Milwaukee Instruments MW102
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Old 02-03-2019, 07:51 AM   #4 (permalink)
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Default Re: Regarding pH Meters

Is the last tank soft water? What's different about it from the other tanks?
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Old 02-05-2019, 08:09 AM   #5 (permalink)
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Default Re: Regarding pH Meters

The water is softer but not soft. It has a GH of 6 and a KH of 4. The GH of the others is probably around 13 but I haven't checked them yet. Our tap water is at about 13. I brought the GH of the CO2 injected tank down using RO water. The pH is lower due to the CO2. The range is maintained between 6.7 and 6.9 by my CO2 system. When I changed my CO2 tank yesterday the pH went up to about 7.4 in 12 hours while without CO2. The other 4 are around 7.4. In buffer solutions the meter reacts very quickly and consistently at 7.01 and 4.01.

Last edited by Beasts; 02-05-2019 at 08:12 AM.. Reason: Addition
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Old 02-05-2019, 08:55 AM   #6 (permalink)
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Default Re: Regarding pH Meters

The sensor requires electrolytes to calculate pH. Maybe the softer tank has less electrolytes so taking longer.
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Old 02-06-2019, 11:57 AM   #7 (permalink)
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Default Re: Regarding pH Meters

Spoke to Jason at Milwaukee Instruments, again, and he didn't think the electrolyte level would be low enough at my hardness levels to cause a problem. He did suggest that something called amperage leakage (?) might be a problem. I do have something with a probe that you place in the aquarium attached to a ground that you plug into an outlet which is supposed to prevent that problem and, at this point I am still testing to see whether that is working properly. So far it seems to be working fine but I will keep checking and report my results.
Thanks for the input.
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Old 02-28-2019, 06:56 AM   #8 (permalink)
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Default Re: Regarding pH Meters

Out of curiosity how are you storing the probe? And was it a *new* probe or was it a used one?

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