Bruker CryoProbe User Manual

Cool-down problems
CryoProbe User Manual BRUKER 75 (107)
again. If this doesn’t help, inspect the CryoProbe top and the shim system for dirt
or damage.
If there is no gap, check if the CryoProbe’s circumferential top edge touches the
blue spinner stator: take the CryoProbe out and put a soft non-magnetic ring onto
its top, e.g. an o-ring or a ring made of cardboard. The ring should have a well-de-
fined height and an outer diameter of less than 38 mm. Insert the CryoProbe.
Measure the new gap and subtract the height of the ring. The missing length be-
tween CryoProbe and spinner stator results. If it is in the order of 1 mm or more,
call your B
RUKER service office
Indicator on CryoProbe sticks out 7.4.3
In the upper right corner of the front plate, there is a little hole with an indicator in-
side. This indicator must not stick out but be flush with the CryoProbe front. If the
indicator sticks out, a problem with the vacuum insulation may have occurred -
contact B
RUKER! Do not try to move the screw, neither in/out nor by rotation.
When cooling-down the CryoProbe, this indicator will move in.
CryoController failure 7.4.4
Reboot the CryoController via the mains O
FF/ON on CryoCooling Unit front. See
"Emergency Off" on page 71
for the consequences of a mains OFF/ON.
The CryoController inside the CryoCooler cabinet has an overheat protection.
Leak in He supply 7.4.5
If the He Regulator or the He Hose between He steel-cylinder and CryoCooling
Unit are accidentally damaged, close the He steel-cylinder main valve immediate-
ly, then close the He Regulator. If time permits, watch the pressure gauges and let
the remaining He gas escape before closing the He Regulator.
WARNING: If a large quantity of helium gas escapes from the He steel-cylinder
during a short period, there is a danger of suffocation, particularly in small rooms.
Moreover, high local concentrations of helium gas can penetrate the seals of an
NMR magnet, thereby spoiling its vacuum insulation and eventually lead to a
quench. Care for good ventilation and fresh air supply after an accidental release
of large quantities of helium gas.
Cool-down problems 7.5
0
COOL DOWN command is ignored 7.5.1
A cool-down can only be initiated when the whole CryoProbe System is at room
temperature. If a passive warm-up has occurred a few hours ago, the system may
not be completely warm yet. In this case, the CryoTool will display
Waiting for
system to passively warm up.

Bruker CryoProbe Specifications

General

Brand	Bruker
Model	CryoProbe
Category	Laboratory Equipment
Language	English