Maintenance
87
10.2.6
Replacing the O-rings on the HTFr
The O-rings on the HTFr are on the anhydrone and on the combustion tube. Each have two O-
rings which must always be replaced together.
10.2.6.1
Replacing the O-rings on the moisture filter
The O-rings on the anhydrone are at the top and bottom end of the reagent tube. The condition
of the O-rings should always be checked when changing the filling. The O-rings should be
replaced if they have taken on a greyish colour or are brittle.
Replace the O-rings on the anhydrone as follows:
1. Turn the analyzer to Position 0 on the main switch or switch to the induction furnace mode
in the ELEMENTS software.
The analyzer in the analyzer must not generate any vacuum in the HTFr.
2. Open the machine door (
1
) at the front of the HTFr.
The anhydrone (
3
) is accessible:
Fig. 44: O-rings on the anhydrone on the front of the HTFr with the machine door open
3. Remove the anhydrone, see
”.
The O-rings are now accessible.
4. Remove the top O-ring (
2
) and insert a new O-ring (Part No. 70320).
5. Remove the bottom O-ring (
4
) and insert a new O-ring (Part No. 70320).
6. Grease the bottom O-ring (
4
) with high vacuum silicon grease (Part No. 92610).
The top O-ring (2) must remain free from grease because it may otherwise become stuck to the
holding mechanism or the glass.
7. Insert the anhydrone again, see
”.
8. Close the machine door.
9. Turn the analyzer to the desired setting.
10. Wait until the HTFr is operational.
The O-rings on the anhydrone have been replaced.
2
4
1
3
