Ph cal

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PostPosted: Thu Mar 22, 2012 9:56 pm
It's simple interpolation math.
You can get the numbers from pH4 and pH9 and calculate both 7 and 10 values.
Roberto.
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Joined: Thu Feb 16, 2012 12:07 am
PostPosted: Thu Mar 22, 2012 10:13 pm
awesome, how would I accomplish this?

Just a thought from a noob and some reading

pH 4 reading would be something like 398

pH 9 reading would be something like 903

I would just change the numbers to make them work for the pH 7 and pH 10, something like this?

adjust pH 4 reading to 698

adjust pH 9 reading to 1003
Image

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PostPosted: Fri Mar 23, 2012 7:41 am
Correct. You just need to calculate the simple interpolation math.
Not too hard, but if you get problems, let us know.
Roberto.

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Joined: Tue Mar 20, 2012 6:16 pm
Location: Columbia, IL
PostPosted: Mon Apr 02, 2012 4:34 pm
When I finish the pH calibration and leave the probe in the 10.0 solution the controller shows the pH @ 9.87 (which is close enough). But when when I remove the probe from the 10.0 solution and put it in my sump the reading on the controller jumped to 20.21. I put the probe back in the 10.0 solution and the display now reads 19.43. There is no way the pH in my tank is that high. I tested with a Salifert pH test and it shows 8.3

Rebooting the controller doesn't make any difference. I've repeated the calibration 4 times now with the same results.

I've only had the controller setup for just over a week now and my probe is new and never been exposed to air.

What can I do?

Thanks

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PostPosted: Mon Apr 02, 2012 4:54 pm
Did you do pH7 first?
Roberto.

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Joined: Tue Mar 20, 2012 6:16 pm
Location: Columbia, IL
PostPosted: Mon Apr 02, 2012 4:54 pm
rimai wrote:Did you do pH7 first?


Yes

Posts: 12288
Joined: Fri Mar 18, 2011 6:47 pm
PostPosted: Mon Apr 02, 2012 5:00 pm
Which numbers did you get on screen while doing the calibration?
Roberto.

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Joined: Tue Mar 20, 2012 6:16 pm
Location: Columbia, IL
PostPosted: Mon Apr 02, 2012 6:44 pm
7.00 = 243
10.00 = 360

Posts: 12288
Joined: Fri Mar 18, 2011 6:47 pm
PostPosted: Mon Apr 02, 2012 7:13 pm
Does not look right.
Is the glass bulb in the tip of the pH probe intact?
Roberto.

Posts: 6
Joined: Tue Mar 20, 2012 6:16 pm
Location: Columbia, IL
PostPosted: Mon Apr 02, 2012 7:18 pm
OMG, There isn't a glass bulb on my probe.
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