Shouldn't complain, we just hit our high for the day at 53 degrees... and I'm with you Dennis. Just got our gas bill in the mail yesterday and it's been a colder than normal winter here in Virginia.
M
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I like doing that as a quick check.No, I did not.
I like doing that as a quick check.
Of course, I'm still confused. The fact you are getting the right voltage spread tells me the probe itself likely isn't bad. I want to believe that the odds of both pH solutions being low is very unlikely. This leads me to believe that I have no idea what I should believe. ;Blackeye
Sorry... ;Sorry
Unfortunately, no. If you know the alkalinity you can calculate the CO2 content off of that. It won't change from salt mix to salt mix, other than that they mix to different alkalinity.Randy is it possible different brands of salt mix could have different pH levels if the salinity/alkalinity were equal? Basically I am asking if the salt d2 is using could largely be responsible for this problem.
Randy is it possible different brands of salt mix could have different pH levels if the salinity/alkalinity were equal? Basically I am asking if the salt d2 is using could largely be responsible for this problem.
Yup.. pH probe issue.
Different media's brands in cal reactors, melt at different ph melting points.Randy is it possible different brands of salt mix could have different pH levels if the salinity/alkalinity were equal? Basically I am asking if the salt d2 is using could largely be responsible for this problem.
The plot thickens.... Maybe?Old probe: 7.68
New probe installed and calibrated 5 mins ago: 7.74
Unfortunately, I'm not surprised. The fact you had a 200mV spread on your calibration made me think replacing the probe wouldn't fix it. But, I also don't think your pH is actually that low. I've been reading through Profilux forums trying to see if I can find a similar issue. That outside water should have read 8.4ish.Old probe: 7.68
New probe installed and calibrated 5 mins ago: 7.74
I don't know but @Brew12 is the wire grounding guru.I’m sure Randy will help (refute?) with this, but I think that you might have a grounding issue. Some sort of ground loop is interfering with accurate readings. It wouldn’t refute the theory, but you could try to ground the liquid that the probe gets moved to, to the tank water. Like a titanium wire between both bodies of water.
Any thoughts?
That outside water should have read 8.4ish.
I just wish I could put my finger on what the problem actually is.
UPDATE:
The cup was outside this morning with a small pump circulating the water from 8am to 12 noon.
Yeah, i was wondering about that too.Maybe the devils in the detail - Dennis vigorously circulating or just spinning? think the theory is its supposed to be aerated
I thought about that but I doubt it is the problem. That would explain why it could calibrate ok but still not read correctly. Where this falls apart is that it should have read the sample from outside correctly. The fact it does not correctly read a sample in a different container rules out any problem within the tank itself.I’m sure Randy will help (refute?) with this, but I think that you might have a grounding issue. Some sort of ground loop is interfering with accurate readings. It wouldn’t refute the theory, but you could try to ground the liquid that the probe gets moved to, to the tank water. Like a titanium wire between both bodies of water.
Any thoughts?
Good point. But over 4 hours I would think that even with just a little circulating it would have come up more than it did. With an air pump you can do the test in 15 minutes.Maybe the devils in the detail - Dennis vigorously circulating or just spinning? think the theory is its supposed to be aerated
When you calibrated the new probe, did you retest it in the calibration fluids when you were done to verify they were correct?This morning my ph is 7.69.
I wish it was. I originally started with API, then bought a Salifert...same thing. Had a friend come over with his higher end test kit and got a slightly higher reading, but that was later in the day than my testing.I assume pH 6.3 is a typo?