64 (107) BRUKER CryoProbe User Manual
Monitoring and Maintenance
See Table 6.1. for a workaround that will temporarily solve the problem. If you
want to have the problem fixed immediately in a more permanent way, arrange a
B
RUKER service visit within the next days. Keep the system running in the mean-
time - if it warms up, the contaminations would thaw and distribute throughout the
system which makes the service actions more difficult.
In any case, a special procedure has to be performed by a B
RUKER engineer to re-
move the impurities from the system. This will typically take overnight and the fol-
lowing morning.
CryoProbe insulation indicator 6.1.3
In the upper right corner of the front plate, there is a little hole with an indicator in-
side. This indicator must be flush with the CryoProbe front at room temperature. If
the indicator sticks out, a problem with the CryoProbe’s insulation may have oc-
curred - contact B
RUKER! Do not try to move the screw, neither in/out nor by rota-
tion. When cooling-down the CryoProbe, this indicator will move in.
Periodic checks 6.2
0
CAUTION: Check your CryoProbe System carefully as recommended at regular
intervals. Lack of monitoring and preventive maintenance can result in degraded
performance or even in permanent damage.
Monitor the He Compressor’s pressure gauge. When idle, the static pressure in-
side the He Compressor loop is about 17.5 bar.
For the water-cooled He Compressor, check the cooling water flow rate and tem-
perature.
Log-book 6.2.1
All users should record the status of the CryoProbe System at regular intervals,
e.g. at the start and stop of each cool-down or warm-up. Use copies of Table 6.2.
on the following page to create a log-book. All observations are important informa-
tion for B
RUKER service engineers when they start to diagnose a problem.
Table 6.1. How to postpone a
Warm-up needed soon request
step action
n.1 Complete the current experiment or set of experiments.
n.2 Start a
WARM-UP at the next convenient occasion.
n.3 Leave it warm for at least 1 h.
n.4 Press C
OOL-DOWN again.
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