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Section 3
Operation
Caution Overfilling cylinders may result in damage to the level and
pressure gauges. If overfilling should occur, remove excess liquid nitrogen
by opening the liquid nitrogen withdrawal valve immediately.
Liquid Withdrawal for
Thermo 8127 are to be used only for low pressure liquid withdrawal.
The primary relief valve is factory set at 22 PSI. The secondary safety relief
Model 8127
is set at approximately 35 PSI. Transferring liquid at higher pressures
increases the flash-off rate of the liquid and adds to the risk of sparking.
To transfer liquid, attach the transfer hose or withdrawal spout to the
liquid connections (see accessory sheet). Slowly open the liquid valve to
flow the liquid. The liquid will vaporize at first until the transfer line or
withdrawal valve cools down. If using a transfer hose to extract liquid from
the Thermo 8127 into an open dewar, a phase separator is recommended
on the end of the transfer line.
Transfer pressure should be kept to a minimum. The normal evaporation
of the liquid will usually maintain enough pressure for transferring.
Caution If the liquid or vent valves are not closed, the container can
become contaminated after being emptied.
Thermo Scientific
Cryogenic Transfer Vessels
3-7
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