Recovering From An Unexpected Event; Ccc Has Not Reached Room Temperature (285 K) - Agilent Technologies Cryogenic User Manual

Recovering from an Unexpected Event

C A U T I O N

CCC has not reached room temperature (285 K)

Cryogenic Systems Operation
ALWAYS confirm that the cause of the cryogenic system shutdown
has been correctly identified and resolved before restarting cooling.
Check the error log. Failure to do so may cause damage to
equipment. If in doubt, contact Agilent Customer Service.
Because the CCC takes much longer to warm up (without an
accelerated warm- up) compared to the Agilent Cold Probe, it
may be much colder than the Agilent Cold Probe. If the CCC
were to start while it was cold and the probe warm, the
probe would be thermally shocked, potentially damaging it.
The CryoBay automatically checks the CCC temperature
before beginning. A warning window appears if the CCC is
cold
(<285 K).
Figure 40 CCC cold warning window
If no action is taken, it will take approximately 48 hours for
the CCC to warm up to room temperature.
It is important to determine why the system did not finish
Warming. If an error code caused the system to go Safe,
then do not fast- warm the system, instead call field service.
Generally, the only condition that warrants a routine use of
<SETWARM> is a power failure.
To resume the Warming operation:
1 Open the CryoBay Controls Advanced window.
2 Verify that the cryogenic system is in either the Idle or
Safe state.
In the Send CryoBay command line enter,
3
page 104:
<SETWARM>
7
Unexpected Events
Figure 41 on
103