Ulvac UMP-40W, Instruction Manual

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32 ULVAC CRYOGENICS INCORPORATED
When the temperature of the dewar goes down, liquid nitrogen begins to be accumulated.
The liquefaction continues until liquid nitrogen in the dewar reaches 100 litters (100%). After
that, liquefaction starts when the amount of remaining liquid nitrogen is below 75L (75%), and
stops when it reaches to 100L (100%). This cycle goes on repeatedly.
Shutdown
When the UMP-40W is turned OFF with the RUN/STOP, RUN/STOP lights off and all the
operations stop including LN
2
production, supplying nitrogen gas, or dispensing LN
2
.
Due to the residual heat of C30PMVRT, stop cooling water supply at least ten minutes after
turning OFF the RUN/STOP of UMP-40W
When suspending for long time (for 1 to 2 weeks) and resuming UMP-40W
(1) Disconnect the remote cable from GN-30i before pressing the RUN/STOP switch of
UMP-40W and open the front panel of GN-30i.
(2) Turn the GN-30i to local operation. (Refer to the operation manual for GN-30i.)
(3) Press the button on the front of GN-30i to startup and keep supplying nitrogen gas to
UMP-40W for at least one hor.
(4) Stop GN-30i, switch the GN-30i to remote operation, and connect the remote cables for
nitrogen generators.
(5) Press RUN/STOP button of UMP-40W to reboot the entire system.
NOTE: Inform us in advance when the system is to be suspended for longer than two weeks.
When the system is suspended operation for a long time, liquid nitrogen in the dewar will be
replaced by the air. If the device is resumed in such a condition, the liquefaction efficiency
deteriorates due to the moisture in the air. Follow the procedure below when resuming.
CAUTION