Ametek ORTEC MOBIUS-B, User Manual, Page: 24 / 28

PROPERTY OF AMETEK, INC. – ORTEC ®
ORTEC
® MÖBIUS™ Recycler HPGe Detector Cooling System
805709F / 1115
18
4.3. TRANSPORTING OR SHIPPING THE MÖBIUS
1) Empty and warm the MÖBIUS according to Section 4.2.
2) Using a #1 Phillips screwdriver, remove the screws from the cooler cover and set them aside.
3) Grasp the cooler cover firmly and pull up or push sideways on it to break the friction grip of the cover gasket
(which is very “sticky”). The gasket is affixed to the top of the MÖBIUS, not the underside of the cover flange.
If necessary,
carefully insert a thin, flat-blade screwdriver under the cover flange — not under the gasket! —
and gently lift the cover until the seal breaks. While doing so, take care not to deform the edge of the flange,
damage the gasket, or mar the dewar’s finish.
4) Insert the foam block, recessed side down, on the cooler.
5) Replace the cover and tighten the screws just enough that they will not vibrate loose. Do not overtighten .
This seal is intended as an air dam, not a pressure seal , so tighten the screws only enough to establish
uniform , snug contact with the gasket.
4.4. DETECTOR WARM-UP
To warm a detector to room temperature, turn the MÖBIUS rear-panel power switch to the “Off” position, open the
fill and vent valves to depressurize the system, and remove the detector/cryostat assembly according to Section 4.5. It
takes approximately as much time to warm up a detector as it does to cool down, e.g., 12 to 36 hours or more.
4.5. REMOVING THE DETECTOR/CRYOSTAT ASSEMBLY
This procedure requires two people and a step-stool. If the detector is still cold, the person working beneath the shield
stand must wear cryogenic gloves and eye protection. If removing a PopTop detector, be sure to read Section 3.3.2.1
and the PopTop user manual first.
●
No center plug — As user #1 lifts the detector/cryostat from above, user #2 helps lift the assembly and pulls
the transfer collar's RTV piece free of the mouth of the dewar. Optionally, user #2 may use a methanol squirt
bottle on the cooling rod at the top of the fill collar, to lubricate the cooling rod is pulled up into the shield. As
the detector cable is pulled up through the bottom of the shield, ensure that no connectors are pulled loose
or otherwise damaged.
●
With center plug — As user #1 lifts the detector/cryostat from above, user #2 helps lift the assembly of the
mouth of the dewar (optionally using methanol as in the preceding paragraph). As user #1 continues lifting
the detector/cryostat with one hand, user #2 pushes up one of the center plug pieces until user #1 can lift it
NOTE Any time the MÖBIUS is transported or handled in such a way that the unit might accidentally be inverted
or placed on its side, it must be emptied of LN2 and the foam block shown in Figure 6 must be reinstalled
under the cooler cover;
otherwise the cooler may be damaged. Remove the foam when the MÖBIUS is
relocated and ready for refilling.
Do not operate the MÖBIUS without the cover installed; it is required for proper air flow to the cooler.