PH Calibration on P3

[atles]

Hi, after upgrading to P3 I cannot calibrate the PH probe correctly. I have tried calibrating with 4 and 7 and 4 and 9 fluids, but the reading is totally wrong (reading 5.60). The probe(and computer) is under 6 months old, and worked fine before the upgrade. Can you help please?

Regards,

Atle.

[aqua_digital]

For marine use you should be calibrating with 7 and 9.

[atles]

Aha, thanks a lot that worked.

Regards,

Atle.

[tomcoleman]

i have calibrated my probe but it said use the 4 and 7 solutions??

do i need to re-calibrate? how do i tell the GHL i'm using 7-9 solutions?

[aqua_digital]

For Marine tanks as you are reading higher than pH 7 you must set the mid range to 7 and the reference to 9.

How do you tell the controller? By changing the input value when asked to do so.