ULVAC CRYOGENICS INCORPORATED
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8. Operation
8.1 Checks prior to operation
Check the following before starting the operation.
(1) The power source of MP-300K and GN-20 are connected properly.
(2) There is sufficient space in front of the air inhale and exhaust areas of GN-20.
(3) Cooling water hose is connected correctly between MP-300K and water supply.
(4) Nitrogen gas tube is connected correctly between MP-300K and the nitrogen gas
source.
(5) The RUN/STOP button of MP-300K is turned OFF (light off).
(6) The main power source of MP-300K and GN-20 are ON.
(7) Nitrogen gas generator remote cable is connected properly between MP-300K
and the nitrogen gas generator.
8.2 Operation preparation
8.2.1 Start supplying nitrogen gas
(When using GN-20i)
(1) Press the GN-20i POWER button to startup GN-20i. The POWER button lights
green when it starts up normally.
(2) Nitrogen gas supply starts after six minutes of GN-20i startup along with the rise of
the ball in flow meter in the center. When nitrogen gas supply starts, N
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GAS
ALARM light of MP-300K is turned off. Check that the center of the ball is at
20NL/min. When it is not at the right position, adjust with the flow rate control
valve. Refer to the GN-20i instruction manual for the procedure.
(For the system with nitrogen gas supply)
(1) Open the nitrogen-gas supply valve, supply nitrogen gas to MP-300K.
(2) Open the front door of MP-300K, adjust the pressure to 0.25MPa with pressure
regulator. A click sound is heard (sound of a pressure switch), and N
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GAS ALARM
lamp turns off. Then, adjust the pressure to 0.2MPa. After that, check that the ball
center of a flow meter is on the position of 20 NL/min. When shifted, adjust the flow
rate by the control valve.
CAUTION
Use nitrogen gas with proper flow rate and pressure. Otherwise, the generation of liquid
nitrogen may be hindered.
