multi N/C 2100S Maintenance and care
73
5. If required, flush the U-tube with ultrapure water and leave to dry completely.
6. Fill the U-tube with new copper and brass wool using tweezers or a small hook.
Note: Replace the complete content of the U tube. When filling the halogen trap
make sure that the copper and brass wool is not compacted too much and no larger
empty spaces are created in the U-tube.
7. Cover the copper and brass wool with cotton wool.
8. Press the filled U tube carefully into the clamps.
9. Connect hose no. 3 to the gas inlet branch with copper wool and hose no. 4 to the
gas outlet branch with brass wool.
10. Check the system for leaks (see section "Checking the system for tightness" p. 89).
11. Close the doors of the analyzer.
7.5 Exchanging the catalyst
7.5.1 Lifetime of the catalyst
If the effectiveness of the catalyst decreases, the combustion tube has to be filled again.
A check has to be performed after expiry of the service interval (maximum 1500
injections). The expiry of the maintenance interval is displayed in multiWin by a
message.
The lifetime of the catalyst strongly depends on the sample material, approx. 1500
injections can be assumed on average. The lifetime can be lower for especially loaded
samples, especially high salt content. The lifetime for less loaded samples is often
significantly higher.
7.5.2 Removing the combustion tube
CAUTION
There is a risk of burning on the combustion furnace! Only remove the combustion tube
when the device is cold or allow the device to cool down sufficiently!
Before switching off set the furnace temperature in multiWin to 20 °C and exit multiWin.
Otherwise
there is a risk of burns when checking the system for leaks after installation!
Remove the combustion tube as follows:
1. Switch the analyzer off on the main switch, pull the mains plug from the mains
outlet and disconnect the gas supply.
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