In my quest to understand how my Compupool CPSC48 works, and to try to understand why I periodically get the high salt indication, I decided to run a little test.
Tech support sent the calibration instructions, and the told me to set the polarity numbers to -18. The calibration instructions say something different, and it also talks about using a clamp ampmeter to measure the current to the cell. I like this idea since I prefer to have a scientific reason for doing something rather than a seemingly arbitrary action.
Since I have a clamp meter, I thought I'd see what this thing does.
When it goes though the power up salt check, it will run the output current to the cell from 0 up to about 36-37 A. Interestingly, it will do this no matter what the polarity corrections are set to.
When I entered the calibration mode, both polarities were set to -18, and the current was 34.6 and 34.7.
I changed the settings to achieve 30A, this resulted in -63 and -67. When I restarted the unit, after the check ran up to 36A, it went back to normal operation - 100% setting resulted in 30A, 50% was 20.4A, and 10% was 8.0A.
Seeing the strength of the "cloud" was weak at 100%, I realized that the apparent maximum current is around 36 or 37A, the point that the startup test runs up to.
I chose to re-calibrate mine to 35A - in order to have a little cushion below the max.
The polarities needed to be -6 on Pol1, and -7 on Pol2. Both now read 35.0A.
Restart of the unit was the same as before and here is the output % and Current on Pol2:
Salt concentration according to test strip is 3330.
Actual water temp: 86 F
Temp Reading in CPSC: 96
So what does all this mean? I don't know, but at least I understand how it works and what the correction factor does. It will be interesting to see if it changes after a few months, and what would happen at a different salt concentration. I'll also see if I still get the random "high salt" indication.