SU71368A1 - Manometer - Google Patents

Description

The invention relates to a pressure gauge. for measuring low pressures. The principle of the described gauge, like the McLeod gauge, is based on the Boyle-Mariott law. In a manometer, mercury can be replaced by other cheaper liquids, for example, oil, which, in addition to its cheaper cost, makes it possible to measure lower pressures, since mercury has a relatively high elasticity of saturated vapors. The range of measured pressures ranges from 1 to 0.000001 mm Hg.

FIG. 1-6 depict two exemplary embodiments of a pressure gauge.

Depicted in FIG. 1 pressure gauge for measuring low pressures is characterized by the presence of a cylinder / and a four-way valve 2. In FIG. Figure 2 shows the position of the crane 2, in which the cylinder / is connected to atmospheric air of pressure P, and vessel 3 is connected to the cavity of measured pressure X. The pressure of air in vessels 3 and 4 is the same.

FIG. 4 shows another position of the crane 2, in which the cylinder 1 is connected to the vessel 3. The PicKOMoe pressure is then calculated by the formula

where V is the volume of the capillary, and V is the volume of the vessel 4.

In one turn of the crane, the required data is prepared for the new test. By varying the volume of the cylinder /, it is possible to adjust the height h of the liquid, i.e., the size of the entire manometer.

The pressure gauge shown in FIG. 2 and 5, equipped with a four-way valve 2 and a crane 5.

FIG. Figure 2 shows the position at which valve 5 is open, and valve 2 connects the balloon / with atmospheric air and vessel I with the cavity of measured pressure X.

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FIG. 6