Ph Calibration; Orp (Redox) Calibration - Blue I HydroGuard HG-302 Manual De Uso

4.4.2 pH Calibration

pH is calibrated using an Phenol Red or Buffer 7 solution.
1. Shut off the water inlet and outlet from the flow cell
2. Remove the pH sensor and temperature probe from the flow cell.
3. Wipe sensor probe with a dry cloth and submerge it and the (PT-100) temperature probe into a
cup with the Phenol Red or Buffer 7 solution and wait for the reading to stabilize.
Note: The reading will not stabilize if the temperature probe is not also in the buffer solution
4. Press (Scroll) until pH Calibrated to appears in the LCD display.
Enter
5. Press
6. Enter the password. Press the up arrow
reached.
Enter
7. Press
Enter
8. Press
9. Press the up arrow
on the label of the Phenol Red or Buffer 7 Solution.
10. Press
Esc
11. Press
Note: pH and Redox (ORP) sensors tend to be slightly erratic in the first 24 hours they operate. If the
above calibrations are performed immediately after these sensors are installed or replaced, repeat
the calibration procedure in approximately 24 hours.
The temperature probe provides grounding and stabilizes the pH and ORP readings.

4.4.3 ORP (Redox) Calibration

ORP is calibrated using an ORP Standard Solution. A standard closest to the normal operating
value should be used for calibration.
1. Shut off the water inlet and outlet from the flow cell
2. Remove the ORP sensor and (PT-100) temperature probe from the flow cell.
3. Wipe sensor probe with a dry cloth and submerge it and the temperature prove into a cup with the
ORP Standard Solution and wait for the reading to stabilize.
Note: The reading will not stabilize if the temperature probe is not also in the buffer solution
4. Press (Scroll) until ORP Calibrated to appears in the LCD display.
Enter
5. Press
(Enter).
(Enter).
(Enter) again.
or down arrow
Enter
(Enter) to save the new calibration or
(Esc) to return to the main display.
(Enter).
or down arrow until the password is
until the value is the same as the value printed
Esc
(Esc) to abort without saving.
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