C A U T I O N
Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local, regional and
national regulations.
7.1 Maintenance schedule
Table 2 shows the minimum times for regular maintenance tasks. Do maintenance tasks more
frequently for applications that cause unwanted material to collect on the electrode.
Table 2 Maintenance schedule
Task 6 months As necessary
Replace the membrane on page 21 X
Clean the electrode on page 22 X
Calibrate the sensor Set by regulatory agencies or experience
7.2 Replace the membrane
N O T I C E
• Always remove the electrolyte filling screw before removal (or installation) of the electrode from the sensor
body.
• Do not touch the membrane with hands.
Replace the membrane at 6-month intervals or when recommended in General troubleshooting
on page 23.
Note: To see the number of days the membrane has been in operation, push the main menu icon, then select
Devices. Select the device and select Device menu > Diagnostics/Test > Membrane days.
1. Put on the applicable personal protective equipment (PPE). Refer to the MSDS/SDS.
2. Stop the sample flow to the flow chamber.
3. Do the steps in Install the sensor in the flow chamber on page 10 in the opposite order.
4. Remove the filling screw, filling washer and holding nut from the sensor body. Refer to Frame 1 of
Assemble the sensor on page 8.
5. Lift the electrode out of the top of the sensor body.
6. Use a clean, lint-free cloth to remove the electrolyte from the electrode.
7. Examine the silver anode at the end of the electrode.
8. If more than 2/3 of the silver anode is covered by a dark green layer of silver bromide (AgBr),
clean the electrode. Refer to Clean the electrode on page 22.
9. Remove the used membrane from the bottom of the sensor body. Install a new membrane.
10. Do the steps in Frames 2, 3 and 4 of Assemble the sensor on page 8.
11. Do the steps in Install the sensor in the flow chamber on page 10.
12. Start the sample flow to the flow chamber.
13. Set the membrane days counter to zero as follows:
a. Push the main menu icon, then select Devices.
b. Select the device and select Device menu > Diagnostics/Test > Reset membrane. The
calibration data is set to the defaults.
14. Calibrate the sensor.
English
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