calibrating sera co2 controller

[Bidadari]

I have a sera co2 controller that I'm using as a ph meter. I need to calibrate it. I have some pinpoint ph reference (ph7 and 10). The things that I'm not sure are:
- Which one of the references that I should use first
- Which one of the adjusment screws to adjust first

Any help would be greatly appreciated!

Thanks!

 

[Jim Tansey]

You should do the ph7 first as the probe has a zero voltage output at 7ph, then adjust the span with the 10, repete this procedure two or three times cleaning the probe with RO water between ph solutions. Consult the instructions if available.

Jim