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133 Bruker Optik GmbH HYPERION User Manual
Repair and Maintenance 6
14. When the optimal vacuum is achieved, close the dewar evacuation valve by push-
ing the adapter knob (G in fig. 6.3) to the closed position. Press the adapter knob
firmly to the stop position to ensure that the dewar evacuation valve is sealed air-
tightly.
15. Screw the threaded rod of the adapter (D in fig. 6.3) out of the connection thread of
the dewar evacuation valve by rotating the adapter knob (G in fig. 6.3) several turns
counterclockwise until you sense that the threaded adapter rod and the connection
thread of the dewar evacuation valve are not joint any more. Be careful in order to
prevent an unintentional opening of the evacuation valve and consequently to pre-
vent the detector dewar from being vented again.
16. Vent the section between vacuum pump and adapter.
17. Pull the knob (G in fig. 6.3) to the open position. Attention: Make sure that the seal-
ing plug of the evacuation valve is NOT pulled out! This may occur when you have
screwed the threaded adapter rod too far in the connection thread of the dewar
evacuation valve. (See step 10.) In this case repeat the dewar evacuation. If you do
not succeed in closing the evacuation valve at all you have to send the detector in to
Bruker.
18. Loosen the coupling nut (A in fig. 6.3) and remove the adapter from the connection
nozzle of the detector dewar.
19. Reinstall the MCT detector in the spectrometer. See section 6.2.2.
➣
If a tiny amount of air should unawares get into the detector dewar during the evac-
uation procedure (e.g. when you close the evacuation valve) you can perform mea-
surements with this MCT detector for the moment but after a relatively short period
of time you have to repeat the detector evacuation.
Figure 6.3: Adapter - Cross section
open
closed
A
B
C
D
E
F
G