Maintenance and care
92 Edition 01/2016 multi EA 4000
6. Undo the union nut at the argon connec-
tion of the gas airlock (3) and pull off the
hose.
7. Grip the gas airlock and pull the quartz
tube out of the combustion furnace.
8. Unscrew the hexagon socket screws and
dismantle the gas airlock.
9. Using a hook, pull the quartz wool out of
the tube.
10. Check the quartz tube for excessive crystallization, cracks and blown out places.
Note:
Only re-use intact combustion tubes.
11. Flush the tube and dry it.
12. Fill approx. 2.5 cm quartz wool at the entrance of the quartz tube and, using a hook,
push it to the tube end.
13. Then assemble the gas airlock and install the combustion tube in the furnace. Re-
store all gas connections (see section "Preparing the multi EA 4000 for Cl meas-
urements" p. 59).
8.3.3 Servicing the combination electrode
Potential destruction of the combination electrode from detergent or abrasive agent.
For cleaning, the combination electrode may
only be flushed with Ethanol or distilled water.
The use of aggressive detergents or abrasives is prohibited.
If the electrolyte dries on the combination electrode this may cause an irreversible reduction
of the sensitivity or damage of the electrode. Therefore, make sure that the electrolyte never
dries on the combination electrode:
during a brief pause in operation (from one day to the next):
store the electrode in the electrolyte solution.
during decommissioning for several days:
rinse the combination electrode with ultrapure water and ethanol. Leave the elec-
trode to stir in ethanol overnight. Then wipe the combination electrode with cellulose
and store it dry.
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