PH @ 10.50??

[9975]

I woke up this morning and my PH was reading 10.50 when it is consistently 8.0 - 8.2. I went down to the sump to clean the probe really go and calibrated it but ended up with the same results. I turned my Profilux 4 off, then on, unplugged the probe, plugged the probe back in and calibrated....same results yet again.

I'm going to put a ticket in but thought I would see if anyone has had the same issue. Oh and the probe is ~8 months old.

Thanks!

 

[esther]

I woke up this morning and my PH was reading 10.50 when it is consistently 8.0 - 8.2. I went down to the sump to clean the probe really go and calibrated it but ended up with the same results. I turned my Profilux 4 off, then on, unplugged the probe, plugged the probe back in and calibrated....same results yet again.

I'm going to put a ticket in but thought I would see if anyone has had the same issue. Oh and the probe is ~8 months old.

Thanks!

I was having an issue with my pH probe reading lower than normal. Ended up soaking it in white vinegar (1:10 with RODI) for an hour and it went back to normal. There's probably some growth on the probe that you can't see.

 

[esther]

Oh, I should mention that I have a cheap pH Pen that I bought on amazon to double check pH as well after calibrating the GHL one.

 

[9975]

I was having an issue with my pH probe reading lower than normal. Ended up soaking it in white vinegar (1:10 with RODI) for an hour and it went back to normal. There's probably some growth on the probe that you can't see.

Thank you for the idea....I'll try it out!

 

[9975]

I checked it with my test kit and it was at 8.0

 

[esther]

Thank you for the idea....I'll try it out!

Good luck!

 

[Dr. Jim]

Hanna makes a 8.2 Calibration Solution that I found to be very helpful for checking to see if the pH probe is accurate. After calibrating your probe, you can put the probe into this solution to see if it reads 8.2. The accuracy is 0.02 (which is very good!)

I found that when comparing the Pin Point calibration solutions with the GHL solutions, by calibrating the probe with each brand, there was a difference of 0.1 with my probe. I found that the true reading, based on the Hanna 8.2 solution, is about halfway between what the PinPoint and GHL solutions gave me. So, in my case, the GHL solutions calibrated a little high ...by about 0.05 (or 0.03-0.07 considering the error of 0.02 with the Hanna solution). (All this is with assuming the Hanna standard is accurate, of course!)

 

[Lasse]

If it shows 10.5 - the pH probe (or in worst case the electronic) is probably broken. It is the max for GHL pH probes. If it is a P4 (not P4e) - configure the redox channel to be a pH input and test. This way you maybe can see if it is the probe or the pH channel that´s not work properly. But definitely - send in a ticket

Sincerely Lasse

 

[9975]

I cleaned the probe as suggested and came to the same end results. Thanks for the idea Lasse! That's next on the to-do list.

 

[Michael Gray]

What's the status. I change redox probe into ph probe and calibrated with 7 and 9 fluids. Currently have them sitting next to each other in sump and one is 8.56 and one is 8.70(old redox)

I recalibrated both like 5 times tank one is still good at 8.55 and now one in my reactor without any co2. Just tank water recirculating. It's showing 7.5

I'm wondering after switching the redox to ph it needs time to break in? I wanna make sure it's accurate obviously because it will be in carx and don't wanna melt media or think it's working but really to high. Etc.

 

[Lasse]

It seems fishy. Which probe use "the old reox circuit? Whats happens if you change the electrodes? First put the one from the CaRx to the sump and the other way around. A second test - have it as it is but change the connections.

Can you attach a screenshot of your calibration data of both probes/circuits - look below

Sincerely Lasse

 

[Michael Gray]

It seems fishy. Which probe use "the old reox circuit? Whats happens if you change the electrodes? First put the one from the CaRx to the sump and the other way around. A second test - have it as it is but change the connections.

Can you attach a screenshot of your calibration data of both probes/circuits - look below

Sincerely Lasse

Woke up this morning and now says 7.9

Will a ph probe in a full reactor naturally have a lower ph from media. Even without co2 currently? I mean it's drawing water right where the tank probe is sitting too

 

[Lasse]

pH value 2 seems to have very strange Calibration data. Normal data use to be somewhere like your pH 1

My guess is that pH 2 is your CaRx probe and the one that caused problem before

@Vinny@GHLUSA


By the way - is it a P3 or P4 you have? You should deactivate Dynamic nominal value - especially if you have a P3

Sincerely Lasse

 

[Michael Gray]

Pro4.

pH value 2 seems to have very strange Calibration data. Normal data use to be somewhere like your pH 1

My guess is that pH 2 is your CaRx probe and the one that caused problem before

@Vinny@GHLUSA


By the way - is it a P3 or P4 you have? You should deactivate Dynamic nominal value - especially if you have a P3

Sincerely Lasse

Profilux 4. I just tried to recalibrate it with 4 and 7 ph fluid I got from ghl. And watching the screen the time ticks down but the batch doesn't move. It starts at 1023 and stays there and beeps 3 times. Then I put in 7ph fluid and it starts at 1023 and beeps 3 times. So it's not even calibrating. Then it will read 10.5 in the 7ph fluid. When I put it in tank it goes to 3ph.

 

[Michael Gray]

I scratched the idea of calibrating with 4 and 7 with kh fluids. Went back to 7 and 9. Here is the adc numbers


.here is original ph probe numbers

Right now I put both probes back in sump. Side by side to see what happens and as.of right now they are reading very similar. Wondering why when I put it in my carx it drops when it's all the same water without co2. Unless reborn media has a tendency to naturally drop ph slightly

 

[Lasse]

I´ll think it is something wrong with the pH2

Sincerely Lasse

 

[Michael Gray]

I´ll think it is something wrong with the pH2

Sincerely Lasse

The probe or the dam unit before ph2

 

[Lasse]

Probably the probe - but to be sure - put the probe for pH1 into pH2 and the other way around. Calibrate and see if the wrong calibration data follow the probe or the circuite

I mean switch the probes

Sincerely Lasse

 

[Michael Gray]

Probably the probe - but to be sure - put the probe for pH1 into pH2 and the other way around. Calibrate and see if the wrong calibration data follow the probe or the circuite

I mean switch the probes

Sincerely Lasse

I decided to take the real ph probe. The one in sump. And calibrate it to the 4 and 7 ph. And I took the redox and calibrated it to 7 and 9. Again the 7ph used the 1023adc. But I used my real ph probe for the reactor. I put it in my carx and put the redox probe in sump and for last 35 min they been acclimating. And closing the gap.

I'll probably buy 2 new ph probes from vinny but this way here I might have solved the issue for now. But it would be nice to get 2 new probes just to be safe.


They started with. Large gap and now it's slowly closing together