CryoProbe Safety
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6.3 Pressurized Helium Gas Supply
The CryoPlatform works with helium gas (He) that is pressurized up to about 25 bar and
cooled to cryogenic temperatures around 20 K. All pressurized parts are kept in strong
enclosures which are designed to hold back gas jets or ejected particles in case of a rupture.
If unprotected skin is exposed to cold He, severe cold burns are possible.
WARNING: Move, connect, and operate the He steel cylinder carefully. Obey all safety
precautions pertinent to high pressure gas containers and magnetic objects.
WARNING: The He steel-cylinder and its entire transport path must always be outside the 0.5
mT (5 Gauss) range of the magnet.
WARNING: Fix the He steel cylinder reliably to a wall. All local safety regulations for the
installation of pressurized gas systems must be obeyed.
The helium pressure hose between the He steel-cylinder and the CryoCooling Unit carries a
steel wire that must be fixed to the units at its ends. If crossing of walkways cannot be
avoided, the He Hose must be covered or buried. Moreover, the He Hose must be fixed to a
wall or to the floor once every meter.
WARNING: If the He Hose is not fixed it can whip around in case of a rupture.
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. Good ventilation and/or a
fresh air supply can remedy this effect.
Overpressure release noise
Overpressure in the system is avoided by software control and mechanical safety valves. In
an overpressure situation, the release valves will open with an extremely loud BANG! The
sound insulation cabinet will reduce the noise to a safe level, so it is important to always
operate with a closed cabinet.
WARNING: If service must be done on an open CryoCooling Unit during normal operation,
ear protection must be worn.
6.4 Electrical Safety
The CryoCooling Unit’s degree of protection against electrical hazard complies with IEC IP20:
all electrical parts are protected against touching.
WARNING: All electrical connectors must be used as supplied by BRUKER. Do not substitute
them with other types.
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