Hach-Lange NO3D sc Nitrate Sensor - Manual (Page 30)

30
Maintenance
5.3 Replace the sensor cartridge
The sensor cartridge is replaced as described below and in
Figure 13 on page 31 .
1. Clean the sensor and thoroughly dry the sensor cartridge and
the sensor adapter.
2. Unscrew the locking ring and remove.
Important Note: The sensor cartridge must direct downwards so
that no water can run into the sensor adapter. The contacts
between the sensor and the sensor cartridge must remain dry.
3. Pull the sensor cartridge out of the sensor adapter and dispose
of the old sensor cartridge and opaque gasket per applicable
regulations.
4. Ensure that the new opaque gasket is installed during every
sensor cartridge replacement.
5. Insert the new sensor cartridge in the sensor adapter. Pay
attention to the triangular marking on the cartridge and on the
sensor.
Important Note: The sensor cartridge only fits correctly in the
sensor adapter in one position. Pay attention to the markings on the
sensor cartridge and on the sensor adapter.
6. Attach the locking ring over the sensor head and hand-tighten.
Note: Use the cap of the storage container as a tool/screwing aid for
the locking ring.
7. Enter the new sensor code (see certificate).
Figure 12 Chloride electrode