文献中描述了能检查精确度为±13毫米液面位置的连续作用的氦液面计。液面计的作用原理是以测量液氦流体静压的指针式差压计为基础。文献所述结构,在制造时十分复杂(必须抛光探针管的内、外表面,安装辐射屏、配重室、抽空阀)。此外,文献提出的结构,使连通液面计的高压区和低压区的通道沿线发生热波动。这将导致液面计测量精度降 The literature describes a helium level gauge capable of checking the continuous action at a level of ± 13 mm. The principle of the level gauge is based on a gauge-type differential pressure gauge that measures the hydrostatic pressure of liquid helium. The structure described in the literature is complicated to manufacture (the inner and outer surfaces of the probe tube must be polished, the radiant screen, the counterweight chamber, the evacuation valve must be installed). In addition, the structure proposed in the literature thermally fluctuates along the passages connecting the high-pressure zone and the low-pressure zone of the liquid level gauge. This will result in a drop in the accuracy of the liquid level meter