44 (93) BRUKER CryoProbe Installation
Initial setup
1 open-end wrench 1-
3
/16”
1 open-end wrench 1-
3
/8”
Table 3.10. Interconnect the He Compressor
step action
i.1 IMPORTANT: The o-rings and rubber gaskets on all Flexline connectors
must be very clean and properly positioned.
Use a flashlight for inspecting the Flexline connectors and their coun-
terparts on the He Compressor and the CryoCooling Unit. If necessary,
clean them with a tissue and tweezers but do not use aggressive sol-
vents.
i.2 CAUTION: The attachment order of the Flexlines is important: Always
start with the green R
ETURN line (i.e. at the low pressure side of the gas
cycle), then connect the yellow S
UPPLY line. Connect them first at the He
Compressor.
Loosely attach the Flexline with the green R
ETURN marker to the GAS
R
ETURN port on He Compressor. Each Flexline is symmetric, i.e. there is
no preferred orientation.
CAUTION: Do not interchange S
UPPLY and RETURN. The Coldhead
would become inoperable when switched on and can only be repaired
through complicated service procedures!
i.3 When locking the green R
ETURN Flexline, make the first turns by hand.
Then, use open-end wrenches 1-
3
/16” and 1-
3
/8” on the Flexline’s two
terminal hexagon nuts. After reaching the stop, rotate back by a ¼ turn
to facilitate eventual unlocking.
Treat the yellow S
UPPLY Flexline similarly.
NOTE: Do not put any force on the Flexlines third hexagon nut which
ties the connector to the actual tube. The minimum bending radius of a
Flexline is 0.3 m, i.e. a 180° turn has a diameter of at least 0.6 m! Do not
twist the Flexlines when making the final connections. Do not untie the
hexagon nuts on the He Compressor but check if they are moving while
the Flexlines are fixed. If they are loose, tighten them to the He Com-
pressor housing before proceeding with the Flexlines.
i.4 Fix the green R
ETURN Flexline tightly to the CryoCooling Unit’s
R
ETURN port. Mount the yellow SUPPLY last.
i.5 After connecting all Flexlines, check the S
UPPLY PRESSURE gauge on
the He Compressor front. It should read a bit more than 0 bar without a
drop during several minutes.
IMPORTANT: If the pressure gauge indicates plain 0 bar, contact
B
RUKER: this is a major problem and a lengthy gas purifying cycle is
required.
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