ULVAC CRYOGENICS INCORPORATED
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10. Automatic Supply of Liquid Nitrogen
10.1 Inspections before automatic transfer
Check the following before starting automatic transfer.
(1) Level indicator cable is connected properly between the MP-300K and the level
sensor on the auto transfer destination.
(2) LN
2
transfer piping is properly connected between MP-300K and the dewar in
auto transfer destination.
(3) Nitrogen gas release port is exposed to the air.
10.2 Automatic transfer
(1) Turn ON the MP-300K AUTO READY switch (Standby for automatic transfer)
(2) When the level sensor detects the remaining LN
2
is less than 25%, automatic
transfer starts. Automatic transfer can be initiated by pressing AUTO SUPPLY
button. AUTO SUPPLY button lights white during automatic transfer.
(3) When the level sensor in the auto supply destination detects 100%, automatic
transfer is terminated. Automatic transfer also stops by the following conditions;
1. The MP-300K RUN/STOP or AUTO READY is turned OFF, 2. The remaining
LN
2
in MP-300K is 0%, 3. Nitrogen gas supply stops
Manual dispense cannot be started while automatic transfer is taking place.
When the AUTO READY is pressed and the MP-300K is in standby for
automatic transfer, manual dispense is limited to 25%.
10.3 Time limit of automatic transfer
When certain time (typically 10 minutes) passes from the start of automatic
transfer, MP-300K stops supplying, and AUTO READY and AUTO SUPPLY
buttons blinks alternately. The blink can be cleared by pressing AUTO READY
button.
Check the remaining volume of LN
2
in the target dewar and contact us if any error
is observed.
・
When dispensing liquid nitrogen, make sure to keep the room well ventilated in
order to prevent oxygen shortage.
・
Never attempt to seal liquid nitrogen.
・
When dispensing liquid nitrogen, be sure to put on protective fittings such as
leather gloves. Also, use caution with handling liquid nitrogen supply flexible
hose as it is at the lowest temperature right after dispensing.
WARNING
