Abstract
With an additional circuit and a comparator of an OP Amplifier, two-level controller keeping the liquid nitrogen between an upper and a lower level was developed. A commercial Si diode was shown to be able to be used as a level sensor with good interchangeability, high speed response and 300°C heat resistance. A liquid nitrogen supply system of the controller and an auto pressurized vessel was constructed. The system could supply stably and reliably to a sorption pump even when consumption of liquid nitrogen was not constant at cooling down from room temperature.
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