3point PH calibration

[aloonj]

Having recently purchased some PH calibration solutions (4, 7, 10), I had planned on doing the 3 point calibration. I found some screenshots on adafruit guides showing a low, mid and high calibration option in reefpi, but I only seem to have "midpoint, second point" and cannot seem to find any setting in add the extra point? Is 3 point still possible? reefpi: 4.3.

 

[aloonj]

I guess I should have search more thoroughly first. Found an answer to my query here:

https://www.reef2reef.com/threads/r...ler-based-on-raspberry-pi.289256/post-6224868

As of now we only support two point calibration.

Feel free to move swiftly along

 

[robsworld78]

I guess I should have search more thoroughly first. Found an answer to my query here:

https://www.reef2reef.com/threads/r...ler-based-on-raspberry-pi.289256/post-6224868



Feel free to move swiftly along

As I understand it most meters that have 3 point or more only use 2 point for the calibration, the points closest to pH value are used. I think it's useful when testing goes from acidic to alkaline. For example Atlas Scientific circuit has 3 point, if you are reading over 7.0 the 7/10 cal is used, if under 7.0 the 7/4 cal is used.

 

[Ranjib]

While working on the open source ph probe , I was not able to find a good resource on 3 point calibration. Most documentation only covered two point calibration, hence that’s what is present in the software.
Atlas scientific provides 3 point calibration and if you are using one, you can use that outside reef-pi software, with their python library and it should work for reef-pi .