Bruker CryoProbe User Manual

Cold operation problems
CryoProbe User Manual BRUKER 77 (107)
Cool-down doesn’t reach cold state 7.5.4
The cool-down procedure must have reached the cold state within 4 h, otherwise
a warm-up is initiated automatically. After the system has warmed-up completely,
press
COOL DOWN again.
Did the message
Warm-up needed soon appear recently? If yes, see "Warm-up
needed soon request" on page 63.
Cold operation problems 7.6
0
COLD flashes 7.6.1
It may happen occasionally that C
OLD starts flashing during an experiment. Just
continue the experiment and keep an eye on the temperature readings. The data
quality is usually not affected.
Emergency warm-up 7.6.2
There are two kinds of emergency warm-ups:
In an active emergency warm-up, He is circulated through the system by the He
Compressor. The Coldhead is disabled then and no periodic hiss is audible.
During a passive emergency warm-up, all units except for the supervising Cryo-
Controller are switched off. The system is warmed up by thermal conduction only
which typically takes overnight. Note that a cool-down attempt will be refused until
all parts have reached ambient temperature unless the system has been in the
passive emergency warm-up only for a very short period of time.
He Compressor has shut
down but the switches
remain O
N.
1. No mains power.
2. Abnormal operating He pressure.
3. Abnormal He pressure due to gas
leak.
4. Abnormally high discharge He
temperature due to high room
temperature.
5. Abnormally high discharge He
temperature due to failure of
solenoid valve or high pressure
switch.
1. Check fuses and circuit breakers,
see "Fuses and reset buttons"
on page 73.
2. Adjust He supply pressure or
charge He as required.
3. Check He pressure, charge He,
look for leak (see "He leakage"
on page 81).
4. Check room temperature and
cooling system of operating
room.
5. Restart the unit and check the
pressure. If it is abnormal, check
solenoid valve or high pressure
switch.
Table 7.2. Troubleshooting the He Compressor (Forts.)
Symptom Possible cause Elimination

Bruker CryoProbe Specifications

General

Brand	Bruker
Model	CryoProbe
Category	Laboratory Equipment
Language	English