calibration ph1130

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max.tisc
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calibration ph1130

Postby max.tisc » Tue Aug 22, 2017 5:35 pm

Hello
I have read the posts concerning ph calibration by 2 points but i do not understand how to make the correction, i use the equation PH = 7 - (2.5 - SensorValue / 200) / (0.257179 + 0.000941468 * Temperature)
With the first calibration point at 7.00ph (offset) I will try asymmetry, so I subtract it or add it to the ph value resulting from the equation (correct?)
The second point I do at 4 or 9ph and with the Nernst equation calculate the slope value but at this point I do not know where to enter the value in the formula to get the correct values

Do you have suggestions or other ways to get the result?
thanks

mrcrabs
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Re: calibration ph1130

Postby mrcrabs » Tue Sep 05, 2017 2:27 am

Hi,

Same question for me. As it is very simple to calibrate with a simple equation (example at ​
https://phidgets.wordpress.com/2014/05/ ... r-dummies/), doing the same with temperature compensation isn't described on the web.

Or the problem comes from our lacks in mathematics ... !

It will be pleasant if someone could help us here :-)

Sincerely,

max.tisc
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Posts: 3
Joined: Thu May 18, 2017 9:03 am
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Re: calibration ph1130

Postby max.tisc » Tue Sep 12, 2017 2:03 pm

Hello mrcrabs
thanks for your indication the article is interesting
in the case of calibration I think refer to the temperature of 25 ° C and anyway the calibration solutions are stable at the temperature variation (they come in a few pts of pH)
I will try to find the solution and if yes, I will share it, if someone has any suggestions please post

thank you


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