Discussion about the discrepancy between the photometer and the Zodiac saltwater system.

Contact: Hello


Agent: Hello


Contact: I have a question.


Agent: Yes


Contact: I have a Zodiac salt system that is now one year old. I have calibrated the pH and REDOX probes, but the value does not match the photometer. What could be the cause?


Agent: What is the difference in value?


Contact: The photometer shows pH 7.33 and on the system, the pH value is 6.1.


Agent: When you dip the probe into the standard solution, do you measure the value of the standard?


Contact: Yes, when I dip it into the 7.01 solution, it shows 7, and with the 4.1 solution, the value is 4.


Contact: I have calibrated the probe three times now, but the value still does not match the photometer.


Agent: When you put the pH probe into the pH 4 standard solution, what value do you read? 4? No calibration mode!


Contact: When I put the probe into the pH 4 solution, it shows me the value 4.


Agent: The standard solutions are the only reference. If your solutions are correct, what does the photometer measure in pH 4 and pH 7?


Contact: When I put the pH probe into the buffer solution 4, it shows me the value 4, and when I put the probe into the buffer solution 7, it shows me the value 7.


Agent: And the photometer?


Contact: When I then reinstall the probe, it shows the value (when the filter pump is running) 6.1, but the photometer shows the value 7.33.


Agent: When you measure the standard solution with the photometer, what does it give you?


Contact: ??


Agent: Sorry


Contact: 4 and 7


Agent: Do this, place the probe in a glass of water, let the system run, and see if the value moves.


Contact: Do you have any other possible causes?


Contact: Yes, the value moves until it reaches the target.


Agent: No, I don't understand, everything seems to be working fine, let the system run, maybe the water needs to mix.


Contact: Okay, it's no use.


Contact: I will try to calibrate it again in 2 days.


Agent: Yes


Contact: Thank you


Agent: You're welcome