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本文主要介绍了“YR—80—Ⅱ型电容式低温液面计”的一次敏感元件——电容传感器的研制和设计情况。对电容传感器的工作原理、结构设计、装配工艺等方面做了比较详细地叙述。电容传感器探头外径为φ10mm、测量范围0～1000mm、漏热对液氦的损耗量为0.75 1/24h、内电极,外电极以及零位电容补偿线之间的绝缘电阻大于20MΩ。在内电极引出管中,增加了零位电容补偿线,较好地克服了内电极引线分布电容变化对液面测量的影响;在外电极(外管)与八芯密封插座之间,采用了导热系数小的尼龙材料做连接座,减小了电容传感器上部漏热对液氦的损耗。
This paper introduces the “YR-80-Ⅱ-type capacitive low temperature liquid level meter,” a sensitive element - capacitance sensor research and design. The capacitive sensor’s working principle, structural design, assembly technology, etc. made a more detailed description. Capacitance sensor probe diameter φ10mm, measuring range 0 ~ 1000mm, the heat loss of liquid helium loss of 0.75 1 / 24h, the inner electrode, the outer electrode and the zero-capacitance compensation line between the insulation resistance greater than 20MΩ. In the inner electrode lead-out tube, a zero-capacitance compensation wire is added to better overcome the influence of variation of the distribution of the inner electrode lead wire capacitance on the liquid level. Between the outer electrode (outer tube) and the eight-pin sealed socket, Small coefficient of nylon material to do the connection seat, reducing the upper part of the capacitive sensor leakage of liquid helium loss.