Idegis DOMOTIC SERIES, Hardware Installation And Maintenance Manual

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6.2.2. “STANDARD” MODE
“STANDARD” MODE allows the precise calibration of the pH-sensor using two calibration solutions of pH 7.0 and 4.0, however this method
requires that the pH-sensor is removed from the installation.
PROCEDURE:
IMPORTANT: before closing the by-pass valves, stop the system from control panel (see Section 5.1).
1. Extract the pH-sensor from the holder and wash it with tap water.
Fig. 33
2. Press the “CAL” [17] key the equipment beeps and without releasing the key, press “SET” [20] for a few seconds until the pH
screen [15] displays a blinking “7.0”.
3. Gently shake the sensor to remove any possible drops of water and insert in the standard pH=7.0 solution (green). Gently shake
for a few seconds and press “CAL” [17]. Once stabilised, the screen [15] will display a blinking “4.0”.
Fig. 34
4. Remove the sensor from the calibration solution and rinse it with tap water.
5. Shake the sensor smoothly so that any drops of water that may be adhered to the plastic body are removed and introduce it in the
calibration solution pH=4.0 (red colour). Shake smoothly for a few seconds and press “CAL” [17] key. Once the measurement has
stabilised, the pH-controller will automatically leave the calibration mode and will be operative.