8-5
8.4.3.1 Sensor Maintenance
It is necessary to maintenance the enzyme sensors when the PM kit is installed and periodically as needed.
1. Remove the enzyme Membrane and hold the probe with the electrodes facing up.
2. Wad a small portion of a lint free tissue and wet it with 70% isopropyl alcohol.
3. Using your thumb, press the alcohol soaked wad against the probe’s surface and rotate the probe back and forth.
4. Rinse the probe with authorized rinsing agent (see Section 8.1).
5. Install a new membrane on the probe (see Section 4.8), then install the probe in the sample module.
8.4.4 Sipper pump Seal Replacement
Replace the Sipper Pump seals every 6 months. Heavy usage may warrant more frequent replacement.
Disconnect the tubing from the Sipper Pump. Remove the two hex screws from the Sipper Pump head and remove it from
the instrument wall (see Figure 8-3).
Sipper pump head
Figure 8-3
Pull the white pump base from the clear pump housing. Immerse the clear pump housing in authorized disinfecting agent
(see Section 8.1). After cleaning, rinse the pump housing for 5 minutes with authorized rinsing agent (see Section 8.1).
Wipe dry with a lint-free tissue. Make sure the metal pipes where the tubing connects are not blocked or restricted.
Replace the O-ring seals as shown in Figure 8-4. New seals are supplied in the Preventive Maintenance Kit. Be sure to
reinstall the black spacer between the two small red O-rings.
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