Bruker HYPERION, User Manual

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131 Bruker Optik GmbH HYPERION User Manual
Repair and Maintenance 6
Procedure
➣
Before starting to evacuate the MCT detector dewar, make sure that the dewar does
not contain any more liquid nitrogen and that the detector has warmed up to room
temperature. Take into consideration that the detector warming-up from operating
temperature to room temperature takes at least 3 hours after the residual liquid
nitrogen has been emptied.
1. Remove the MCT detector from the microscope. See section 6.2.2.
2. Connect the adapter to the vacuum pump by flanging a flexible metal hose to the
connecting piece of the adapter (E in fig. 6.26.3) and to the vacuum pump. See
fig. 6.1b. (Note: The connecting piece of the adapter has an OD of 9.7mm.) In addi-
tion, install a shut-off valve between adapter and vacuum pump.
3. Make sure whether the shut-off valve is closed. Switch on the vacuum pump. Leave
the pump running until it has reached its operating temperature.
4. Inspect the O-ring inside the adapter (C in fig. 6.3) for signs of wear.
➣ The O-ring inside the adapter is a wearing part that needs to be replaced after 4 or 5
evacuations at maximum.
5. Remove the cap from the connection nozzle of the detector. (See fig. 6.2a.)
6. Pull the adapter knob (G in fig. 6.3) to the open position and loosen the coupling nut
(A in fig. 6.3).
Figure 6.1: a) Adapter b) Adapter with flexible metal hose and flange
A
B
C D
Fig. 6.1 Component
A
Connecting adapter (for connecting the vacuum pump to the detector
dewar)
B Flange
C Flexible metal hose
D NW 25 flange (for connecting to the vacuum pump)