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lol yep exactly. Read da manuals.this behavior has persisted through two meters, and multiple probe replacements.
How long are you mixing your solution for? My ph will rise at least a few points in the first 5-15 mins of mixing- like someone above mentioned it has to do w oxygen saturation. If ya mix it up in a room w high co2 it will do the opposite, drift down. Mine goes up but then plateaus at o2 saturation. I’ve got a big holding tank for straight water (40ppm), when I initially fill it the ph sits at 5.3-5.5. If I turn on the air stones overnight it’s sitting at 6.4-6.7. It appears the lower the solution concentration the more it’s affected by the added oxygen. The lower the ec the longer it takes to adjust ph too I find. I use ph paper a lot during flush it seems to give a faster more accurate reading than even high quality ph meters. These are my observations, it’s never been an issue for me so I’ve never looked into it too thoroughly. Maybe someone can shed some more light on the specifics?Oh, and yes, I've tried adding pH up or down to buffer, then using the opposite to adjust. No dice, nothing. Is there some special ph up/down you use during flush?
you are never supposed to put a ph meter into strait RO water btw. From Bluelab:
View attachment 855178
Also you should never flush with strait RO water.
How long are you mixing your solution for? My ph will rise at least a few points in the first 5-15 mins of mixing- like someone above mentioned it has to do w oxygen saturation. If ya mix it up in a room w high co2 it will do the opposite, drift down. Mine goes up but then plateaus at o2 saturation. I’ve got a big holding tank for straight water (40ppm), when I initially fill it the ph sits at 5.3-5.5. If I turn on the air stones overnight it’s sitting at 6.4-6.7. It appears the lower the solution concentration the more it’s affected by the added oxygen. The lower the ec the longer it takes to adjust ph too I find. I use ph paper a lot during flush it seems to give a faster more accurate reading than even high quality ph meters. These are my observations, it’s never been an issue for me so I’ve never looked into it too thoroughly. Maybe someone can shed some more light on the specifics?
From Hanna
View attachment 855320
RO, DI, or distilled...
View attachment 855321
All the god damn time! lol
EDIT: The meter is fine when it comes to normal solutions, this behavior has persisted through two meters, and multiple probe replacements.
You store the probe dry? Think it says in my bluelab manual “ if it dries it dies” lol. I used pretty much every brand ph meters over the years..... Hanna, bluelab, trimeter, hm, Milwaukee, nutridip. I never had much luck w the bluelabs but I didn’t used to be so kind to them I suppose. These days I like the nutridip trimeter ones they’ve been rock solid for me. I check/calibrate them one a month but they don’t budge. I use the bluelab kcl The probes stay accurate forever but I’ll switch em out every 9-10months for good measure, the probes 50$- I don’t mindI run the cheap Bluelab pens and they last me a couple years usually each time. I usually just replace them cause it feels about time. Only thing that broke on me was a Truncheon after like 7 years (granted its just a general meter). Never rinse. Never use the storage solution. Never put them in RO water. Just calibrate once every 2 weeks and go. I use them everyday. Don't know but going through multi meters and multi probes I prob would never buy that brand ever again specially if we are talking that many over a 2 to 3 year period if they were all Hanna.
All I was suggesting is ditch the Hanna. Sorry should have said that in the other post. I have had other buddies have nothing but problems with the Hannas over the years.
The other thing is you should let ph buffers chill for a while before taking measurements. I know using the AN down when I mix strait salts I need to usually wait at least 20-30 mins to really get an accurate reading where it isn't drifting anymore. This is without all the PH buffers in bottled nutes. PH Up is even longer.
You store the probe dry? Think it says in my bluelab manual “ if it dries it dies” lol. I used pretty much every brand ph meters over the years..... Hanna, bluelab, trimeter, hm, Milwaukee, nutridip. I never had much luck w the bluelabs but I didn’t used to be so kind to them I suppose. These days I like the nutridip trimeter ones they’ve been rock solid for me. I check/calibrate them one a month but they don’t budge. I use the bluelab kcl The probes stay accurate forever but I’ll switch em out every 9-10months for good measure, the probes 50$- I don’t mind
The difference is we’re using what are likelyIm not that cheap and nowhere near "green", but reading this strikes a nerve.
There's no need to throw perfectly good electrodes away!
They're simply cleaned with 0.1mol HCl solution, or HCl solution with Pepsin if you often measured high protein solutions. (You can get pepsin in a Pharmacy) That works several times when it won't stay calibrated anymore for more then a couple weeks. Does nobody read fking manuals anymore?
I use the same Greisinger electrode daily since almost ten years. It dried out several times and even fell completely dry. Change/refill new reference solution and it should hold its calibration for months to years again. I learned to trust a calibrated quality electrode more than I trust bottled calibration solution.
And i've learned there's no need to calibrate unless something seems odd. And till now my pH meter was never off more than 0.1, it's always been something else. Good electrodes are made for harsh conditions and lab use. What we do with em in many years is less than what they have to take in a couple weeks lab use!
Btw.
If your water has no or nearly no buffering capacity pHing it is quite useless. If you test your runoff with RO water or very low ppm water and your "soil" doesn't absolutely suck there can be no relevant difference. Except perhaps the first few millimeters of "Soil", but who gives a f?
MfG,
Inkompetenz
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