CA76NA
Maintenance
Hauser
53
Cleaning the measuring unit
‣
When cleaning, do not use aggressive cleaning agents or aggressive cleaning methods.
Mounting the measuring unit
1. After cleaning, mount the measuring unit with the securing screws on the cover of
the liquid control unit.
2. Insert the hose of the circuit pump and screw it tight.
3. Close the cover of the liquid control unit and screw it shut.
4. Fit the top part of the measuring unit and tighten the securing screws slightly finger-
tight.
5. Mount the temperature sensor, while making sure you do not lose the O-ring fitted in
the measuring unit.
6. Carefully re-establish all the cable and hose connections.
7. Install the pH electrode and sodium electrode.
8. Check the connections to ensure they are sealed tightly.
9. Switch on automatic mode via
Maintenance
/
Operating Mode
/
Mode
=
AUTOMATIC
.
11.2.4 Calibrating the pH electrode
You can obtain good results with buffers with pH values of 4 and 7. The pH value of
buffer pH1 should be lower than that of buffer pH2. Both solutions should have a
similar temperature, ideally room temperature, and the same temperature as the pH
electrode.
A0050105
13
Electrode holder on the housing of the liquid control unit
1. Navigate in the menu to
Maintenance
.
2. Enter the factory password 1111, or a new password that has been assigned.
3. Navigate to
Maintenance
/
Calibration
/
pH Calibration
.
4.
pH1 pH ---
: Enter the pH value of the buffer solution used.
5.
pH2 pH ---
: Enter the pH value of the buffer solution used.
6.
Temp.
: Enter the average temperature of the buffer solutions. Pay attention to the
temperature dependency of the pH value of the buffer solution used.
7. After entering the values, remove the pH electrode from the measuring chamber and
insert it into the electrode holder (→ 13, 53). Do not remove the measuring
cable.
8. Rinse the pH electrode with deionized water.
