multi X 2500 Maintenance and care
91
13. Carefully push the previously removed quartz wool plug or a new plug into the
combustion tube until it reaches the bottom.
The installation of the combustion tube is done in reverse order.
10.3.2 Change the sulfuric acid and clean the sulfuric acid container (vertical)
WARNING
Concentrated sulfuric acid can cause severe chemical burns! Wear appropriate
p
rotective clothing when working at the sulfuric acid container. Observe all
specifications in the safety data sheet!
CAUTION
Risk of burns! Only remove the sulfuric acid container when the device is cold!
The sulfuric acid absorbs the water that is produced during the combustion process. If
the acid content falls below 85 % the sulfuric acid can no longer sufficiently dry the
reaction gas. As a result, the measured AOX contents will be too low and widely
scattered. For this reason, the sulfuric acid must be replaced once per day. High sample
throughput may require more frequent replacement.
1. Exit the multiWin control software and allow the analyzer to cool down.
2. Switch off the multi X 2500 and the chlorine module and pull the mains plugs from
the power outlet. Cut the gas supply.
3. Remove the top cover or the sample introduction module and open the front doors.
4. Detach the connection hose and spherical joint (1) from the
sulfuric acid container (vertical).
Detach the forked clamp (2) between the sulfuric acid
container and the combustion tube.
Carefully remove the sulfuric acid container from the drip tray
and empty it. Observe the regulations for handling
concentrated sulfuric acid!
Rinse the sulfuric acid container with distilled water several
times. After that, rinse the container with ethanol. Then dry
it (e.g. by blowing it through with an inert gas).
Fill the sulfuric acid container with approx. 40 ml of
concentrated sulfuric acid. Insert the plug to the container.
The installation of the sulfuric acid container is done in the reverse order.
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