Ametek ORTEC MOBIUS-B, User Manual, Page: 8 / 28

PROPERTY OF AMETEK, INC. – ORTEC ®
ORTEC
® MÖBIUS™ Recycler HPGe Detector Cooling System
805709F / 1115
2
The unit can be connected to an uninterruptable power supply (UPS) to sustain operation during short-duration power
failures. Fully cooled, it draws about 150 watts of power from a UPS without a “smart” capability. Alternatively, the
MÖBIUS can run off of a “smart” UPS with a dry contact relay interface, such as the APC SMT750 UPS equipped with
their optional AP9613 dry contact management card. In this configuration, if power fails the UPS signals the MÖBIUS
to enter its power-saving mode to conserve UPS battery life. The cryocooler turns off, reducing power consumption to
less than 10 watts, while the remote status display continues to provide all status readouts including the liquid
nitrogen level in the dewar.
1.3. SPECIFICATIONS
1.3.1. Performance
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Refill Period After the detector is cool and the LN2 is topped off, the MÖBIUS system can run for 2 years or
longer without filling. This is based on the sealing technology and assumes system operation in
uninterrupted, steady-state conditions.
●
Maintenance Wash or replace inlet air filter every 3 months (replacements available from ORTEC). No other
maintenance is required.
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Remote Status Display Readout unit with hardwired umbilical cord can be remotely mounted to improve
visibility when the detector is placed in a lead shield. The display registers the liquid nitrogen level in the
dewar, power level being supplied to the cooler, pressure level within dewar and general status of the
system.
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Internal Controller Control electronics, power supply, and cooler electrically isolated from the dewar and
protected from LN2 spillage.
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LN2 Level Sensing Capacitance level sensor provides continuous measurement of the LN2 level from
0–100% full.
●
Use with UPS The MÖBIUS has a small onboard computer that can receive an input, via the rear-panel I/O
connector, in the event of power loss. The input causes the system to enter power saving mode and turn off
the cryocooler. With the cryocooler turned off, the onboard computer can be powered by a small UPS.
●
LN2 Loss Rate Approximately 3 L/day with non-PopTop cryostats when cooler is off (same as for
conventional dewar); loss rate will vary depending on ambient conditions and detector size. With PopTop
cryostat typical consumption can be as high as 4L/day when cooler is off.
●
Spectroscopic Performance

For new ORTEC detectors purchased with the MÖBIUS: at energies above 15 keV we certify no
degradation of the detector resolution warranted on the detector data sheet, and below 15 keV, less
than 10% of the warranted resolution.

For existing ORTEC detectors in dipstick cryostats, where the MÖBIUS replaces an existing dewar or X-
Cooler®, resolution degradation is based on the existing detector performance. It is expected that the
detector will have similar performance compared to using a standard LN2 dewar. Some degradation
may occur depending on the detector's age and configuration. Note: Detector in a PopTop cryostat
requires a 1.50 inch in diameter dipstick when converting from X-Cooler® to MÖBIUS.

MÖBIUS can be used with existing non-ORTEC detectors in dipstick cryostats having 1.25 or 1.50 inch
diameter. It is expected that the detector will have similar performance compared to using a standard
LN2 dewar. Some degradation may occur depending on the detector's age and configuration.