| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid nitrogen feeder that is ease in pressure control in a container and high in safety. SOLUTION: An axial member 35, wherein a heater 31 for pressurizing the inner part of a container by heating liquid nitrogen in this liquid nitrogen container and evaporating it, and three level sensors 33H, 33M and 33L for monitoring a liquid level of the liquid nitrogen are all assembled, is installed so as to be inserted into the container after passing through a base, and further a controller 49 equipped with both control and display parts is installed in a base upper side end of the axial member 35, and likewise a communicating path communicating to an upper space in the liquid nitrogen container is piercingly formed in the said base, and in turn, a pressure gauge and a nitrogen gas discharging solenoid valve 45 are connected to the communicating path. Moreover, the nitrigen gas discharging solenoid valve is constituted so as to operate after being controlled by the said control part according to pressure in the liquid nitrogen container to be monitored by the pressure gauge.
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