PH Probe issues

[reefaddiction12]

Hi everyone,

I am having some issues with my PH probe that came with my Profilux 3ex Mega Set which was purchased about 3 months ago. I have tried to contact GHL via email but I am not sure if that was the correct way to get help.

My PH probe keeps fluctuating up to ridiculous numbers of 10+ PH and down to 7PH.

I have calibrated the probe following GHL's instructions after calibration liquid was floating in tank water for 24 hours. Did 3x calibration over 3 consecutive days... and every day I got a completely different ADC value;

Original figure: ADC (7ph) 419
ADC (9ph) 261

Day 1: ADC (7ph) 338
ADC (9ph) 214

Day 2: ADC (7ph) 378
ADC (9ph) 247

Day 3: ADC (7ph) 395
ADC (9ph) 263

I am really not sure what the problem is? Possibly a faulty probe? I also checked for electrical interference and disconnected everything from the power board one by one and there was no change.

Any help or information would be much appreciated.

Thanks :)

Joe

[Matthias]

maybe the probe got dry

let us see if the probe stabilizes in the next days, OK?

[reefaddiction12]

Ok thank you :)

Caroline got back to via email just after I had put up this post. Sorry I didn't mean to ask for support twice just wasn't sure if email was the correct way.

I calibrated the probe again last night;
ADC (7ph) 385
ADC (9ph) 252

Now the PH is sitting at 8.22 which is about right. I will keep you updated if it goes crazy again. Thanks for the help.

Cheers

[reefaddiction12]

Ok so the PH probe is still fluctuating like crazy... it sat at 8.18-8.22 for the majority of the day and out of no where it jumped up to 9.6 then back down to 8.5 and now its sitting at 8.86.

Any other ideas?

[reefaddiction12]

Still having lots of problems with the PH probe I have to recalibrate it once every 3 days because it just keeps fluctuating. I still get different values every time I calibrate. I don't know what reading to trust anymore.

[GHL Support]

Hello,

I have sent you an e-mail regarding this issue.

[richard.mayo]

I am also having this issue, but its happening with 2 different probes.

I can actually see the pH fluctuate over 10 min of watching it. Are the probes not allowed to be dry? How do i fix this issue?

[BigAl07]

I am also having this issue, but its happening with 2 different probes.

I can actually see the pH fluctuate over 10 min of watching it. Are the probes not allowed to be dry? How do i fix this issue?

I don't think a pH probe is supposed to ever dry out. You may have to look into new probes if they don't stabilize after a calibration.