PH probe calibration help

Related to the development libraries, released by Curt Binder
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YuppiWanna
Posts: 29
Joined: Sun Apr 17, 2011 6:46 pm

PH probe calibration help

Post by YuppiWanna »

I can't seem to get my PH probe working correctly. I'm running an RAGen PDE and I go in to the PH Calibration menu. I then stick the probe in the 7.0 solution, wait for it to stabilize (~300) and then repeat with the 10.0 solution. Once it's stabilized (~615) I click OK and it just won't save the new settings. The PH readings are still way off (5.xx) so I'll go rich back in to the PH Calibration menu and it's back to some completely different numbers (like 388 and 398).

I've tried it several times and made sure I selected OK to save and not CANCEL. I even tried selecting CANCEL once as a may-as-well-try-it. What am I missing?
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divingdon
Posts: 57
Joined: Tue Mar 22, 2011 8:35 pm

Re: PH probe calibration help

Post by divingdon »

I had the exact same problem and my fix was sent to me by Roberto, he told me to insert the follow lines in my sketch after the ReefAngel.int command.

ReefAngel.PHMin=368;
ReefAngel.PHMax=655;

Use the numbers from your calibration solution.

It work for me I'd bet it will work for you.

good luck

Don
binder
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Location: Illinois
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Re: PH probe calibration help

Post by binder »

I just looked at the code. Once you calibrate and choose OK to save, you need to reboot the controller (power cycle it) for the new values to be read in.

I'm going to work on correcting this so the values are used immediately instead of on reboot only.

curt
YuppiWanna
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Joined: Sun Apr 17, 2011 6:46 pm

Re: PH probe calibration help

Post by YuppiWanna »

Sweet! Thanks guys!
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manoverboard
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Joined: Thu Jul 14, 2011 2:43 am

Re: PH probe calibration help

Post by manoverboard »

How do you power cycle the controller? Just unplug it or is there a restart button somewhere?
binder
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Re: PH probe calibration help

Post by binder »

manoverboard wrote:How do you power cycle the controller? Just unplug it or is there a restart button somewhere?
Yeah, you just unplug it and plug it back in.

curt
rygh
Posts: 21
Joined: Wed Jun 08, 2011 5:07 pm

Re: PH probe calibration help

Post by rygh »

I ended up splitting the code for the PH calibration.

I have a menu for pH 7.0, and a separate one for pH 10.0.
Also, instead of a simple min/max, I use the average of the last 2 reads.

The main reason is that the probe value seems to jump around a bit.
Partly an accuracy issue. The min/max will capture those jumps, where you really
want an average.
But more of an issue when switching between fluids, especially if you want to clean
of the old fluid off.

And perhaps most importantly, it takes time, so I would rather just do one at a time.
rimai
Posts: 12881
Joined: Fri Mar 18, 2011 6:47 pm

Re: PH probe calibration help

Post by rimai »

good solution.
Roberto.
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