36
ULVAC CRYOGENICS INCORPORATED
Problem
Possible Cause
Corrective Action
(6) RUN/STOP button
flickers, and LN
2
production does not start.
(Alarm light is off)
Dew condensation occurred in
the level sensor of MP-300K.
Check tube connection and
nitrogen-gas flow rate of
MP-300K and a nitrogen-gas
source of supply.
The level sensor needs to be
dried. Contact us.
MP-300K level sensor has
dew.
Contact us.
(7) LN
2
cannot be dispensed
There is no liquefied nitrogen
due to initial start-up, etc.
(Liquefied nitrogen level
display is 0%.)
Wait until the liquefied nitrogen
is accumulated.
The level sensor is
incorrect-operating under the
influence of ice and frost
generated inside the container.
Contact us.
Solenoid valve failure
(Working sound of solenoid
valve is not heard.)
Contact us.
AUTO READY is turned OFF.
(When automatic transfer fails)
Turn ON the AUTO READY.
(8) LN
2
does not increase
The system is in initial start-up
process.
Wait about half a day until the
dewar is sufficiently cooled to
store LN
2
.
Helium gas tube and
refrigerator cable are not
connected correctly after
maintenance.
Connect the Helium gas tube
and refrigerator cable correctly.
The level sensor fails to detect
correctly.
Contact us.
