Calibrating Pinpoint Ph controller

[ken6217]

I have an American Marine Pinpoint Controller that I used to use for my plant tank. I can't find the instructions. For a plant tank you use 7.0 and 4.0 calibration fluid. You use the 7.0 for the calibration screw and the 4.0 for the slope screw. Does anyone know how to do it for salt using 10.0 and 7.0?

Thanks,
Ken

 

[jag1979]

10 and 7

 

[Freed]

10 and 7 the exact same way

 

[ken6217]

Thanks. I have a bad probe. I can cal to 10.0, but with 7.0, if I turn the screw all the way to the right, the most I can get it to is 7.05. Also when i first put it in 10.0 solution, it read 9.64.
Ken

 

[Freed]

7.05 is fine. That is not much of an error to get worried about. If 7.5 were the lowest you could get it to go then I would be worried or even 7.1 or .2

 

[2ras]

Most PH probes are designed to last about 18 months. I had to get another one after 13 months of use, because it wouldn't stay calibrated.

Ray

 

[ken6217]

The probe is definitely bad.
Ken