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Charged Probes, Bourdon Tubes Maintain Cryogenic Liquid Level
[摘要] The problem: To design a system that automatically maintains the fluid level in a liquid nitrogen cold trap. It is frequently necessary to operate a vacuum system using one or more cold traps for a prolonged period with the cold trap liquid level maintained between set limits. Electronic devices have been subject to failure due to the effect on components of cryogenic temperatures. The solution: An automatic liquid nitrogen dispensing system that uses gas filled probes, driving Bourdon tube gauges equipped with microswitches that, through a relay, control a solenoid valve in the liquid nitrogen storage line.
[发布日期] 1966-05-01 [发布机构] 
[效力级别]  [学科分类] 航空航天科学
[关键词]  [时效性] 
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