Imago LEAP Recovery Procedure for Cryo-Compressor and Cold Finger

1
Imago LEAP Recovery Procedure for Cryo-Compressor
and Cold Finger
The LEAP is equipped with a Uninterrupted Power
Supply (UPS). Located in the 19 inch rack. This
UPS will keep the entire system running for about
2 hours.
The Cyrogenic compressor (shown at the right)
requires the most energy and is the biggest drain
on the battery. During a brown out/power surge,
this compressor will turn off.
If there are ever ANY questions about a SYSTEM
RECOVERY, call Imago at 608-274-6880. Failure to
PROPERLY recover the system after a shutdown can
cause SERIOUS DAMAGE. MARK LEVESQUE, IMAGO FIELD
SERVICE ENGINEER AT 608-274-6880,
mlevesque_at_imago.com
Please see section 17 of the LEAP user manual,
LEAP System Shut Down and Recovery for
additional information
2
Cryogenic Chiller
The cryo-pump, or cold finger, keeps the specimen
at cryogenic temperatures. When the cold finger
warms up, absorbed gasses will be released from
the surface, causing a spike in pressure.

• The cryo-pump will automatically shut down for
  two main reasons
• Power outage
• No water flow

The cryo-compressor should be turned off whenever
an interruption in the house water is expected or
a filter needs to be changed. Depending on the
time expected for the pump to be off, a few
precautions need to be taken.
3
Manual Shut Down of Chiller lt10 min
If the system will be off for less then 10
minutes, just turn the compressor off. A minimal
amount of out-gassing can be expected.
Advanced User In the LCC settings tab, click on
cryo- settings, then turn the heater OFF. Do
this before turning off the compressor.
4
Manual Shut Down of Chiller gt10 min
If the system will be off for more then 10
minutes, a large amount of out-gassing can be
expected and the system must be put into a safe
mode to preserve the life of the ion pump.

1. Press Cryo Settings and set HEATER to OFF
2. Turn off cryo-compressor (See previous slide)
3. Open Buffer chamber gate valve (in LCC)
4. Close ion pump gate valve (in LCC)

These steps will insure that the desorbing gases
will be pumped out by the buffer chamber turbo
pump, preserving the integrity and life span of
the ion pump. IF YOU HAVE ANY QUESTIONS, PLEASE
CONTACT RICH MARTENS OR MARK LEVESQUE, IMAGO
FIELD SERVICE AT 608-274-6880, mlevesque_at_imago.com
5
Turning Compressor On

1. Make sure water is flowing to the compressor
2. Check that there is Helium flowing to the cold
   head
3. Check that the buffer gate valve is open and the
   ion pump gate valve is closed, (see previous
   slide)
4. On the compressor unit, press the on button. If
   the compressor has been off for an extended
   period, the switch will kick off. Repeat this
   step up to 3 times, If compressor still has not
   turned on, then wait 30 seconds. Repeat three
   times, or as long as needed to start the unit
5. Once the Cryo-pump is running, and the Analysis
   chamber pressure is gt1.0e-9 OR EQUAL to or LOWER
   THEN the buffer chamber pressure, open ion pump
   gate valve and close buffer gate valve. System
   should recover in 2-6 hours, depending how long
   the compressor was turned off