Astralpool PC 2000 Manual De Instrucciones página 29

5.1___CALIBRATION OF THE pH PROBE
The pH electrode has to be re-calibrated periodically, until it is too exhausted, at which point it will
have to be replaced.
The electrode calibration operation is controlled semi-automatically by the PC 2000 instrument,
which is able to recognise on its own the standard value of the sample solution into which the
electrode is dipped, and will display a quality parameter to indicate its degree of exhaustion.
Material required for calibration:
1) Buffer solution with a pH of 7, properly preserved (BOTTLE N° 1)
2) Buffer solution with a pH of 4 or 9.22, properly preserved (BOTTLE N° 3)
3) Clean water for washing the electrode (BOTTLE N° 2)
NOTES:
A solution with a pH of 4 is always preferable to a solution with a pH of 9 or 10, because this pH
value is far more stable in time and is not influenced by the temperature.
While carrying out calibration do not dip the electrode into the buffer solutions without washing it
thoroughly first. Do not rub the electrode with paper or a cloth to dry it. Instead, allow it to drip
dry naturally.
Always store the buffer solutions in a cool and dark place. Do not use a given solution for any
longer than one year.
PROCEDURE
Shut off the flow of water.
1. Enter the calibration menu (See Page 8) and go to
the function PH CAL
2. Press the
the pH probe.
3. At this point the wording CAL will flash on the PH
Display and the 7 pH LED will start to flash.
4. Remove the pH electrode from its tank.
5. Wash the electrode in bottle n° 2
containing clean water.
6. Dip the electrode into bottle n° 1 containing the
solution with a pH of 7 for 15 seconds.
7. Press the
8. If the instrument recognises the buffer solution, the
indication 7.00 will appear on the display.
(If there is an error replace the buffer solution)
key to proceed with calibration of
key.
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