SU847164A1 - Device for measuring liquid density - Google Patents

Description

(54) DEVICE FOR DENSITY MEASUREMENT The invention relates to the measurement of the density of various biological liquids. A device for measuring the density of liquids is known, which contains two pressure transducers, a reservoir with the test liquid, and a differential pressure gauge 1. A drawback of the device is the impossibility of measuring in small volumes of the test liquid. It is also known a device containing a device for creating a reduced pressure, measuring tubes, as well as means for indicating the parameters in them. A disadvantage of the densitometer is the low accuracy of measurements at small volumes of the test liquid. The purpose of the invention is to provide precise measurement accuracy at small volumes of the test liquid. This goal is achieved by the fact that the measuring tubes are provided with a cylindrical shaped MI LIQUID, which are connected by vertical tubes to a device for creating reduced pressure inside these tubes, for example in the form of a pump equipped with a measuring scale drive, the upper end of which is one of. The measuring tubes protrude inside one of the containers by the value of the LN within the axis 0.1 to 0.5 of its height I, and the lower end of one of the vertical tubes is lowered into the other capacity to the level of the upper end of the projecting measuring tube of the first capacity. In addition, the container into which the upper end of one of the measuring tubes enters is additionally equipped with a device for indicating the level of a liquid. FIG. 1 shows the proposed device; in fig. 2 shows an embodiment of the cylindrical capacitance. The device consists of Two measuring tubes 1 and 2, tanks 3 and 4 of cylindrical 3847164 and vertical tubes 5 and 6 connected to a common pump; 7, equipped with a screw drive 8 with a measuring scale 9. The upper end of the measuring tube 2 protrudes into the cylindrical container 4 by the amount of DN in the range from OD to 0.5 of the height of the container And the vertical tube 5 is lowered into the cylindrical container 3 to the level of the upper end of the measuring; tubes 2 protruding into the container 4. The lower ends of the measuring tubes 1 and 2 are lowered to the same depth in the tank 10 and 11 of the same or similar volume, into which the liquid and liquid whose density is known (for example distilled water) is poured to the same level . For the purpose of a more accurate indication of the level of the liquid, the cylindrical container 4 is additionally equipped with an i2 micrometer screw with a measuring scale of 13. The device operates as follows. In the vessel Yu and 11, liquid and liquid of known density are poured to one level, then with the help of pump 7 inside a closed cavity, formed by pump 7, measuring tubes 1 and 2, cylindrical containers 3 and 4 and vertical tubes 5 and 6, a necessary pressure reduction is created, sufficient for the level of liquid with a known density to rise in a cylindrical capacity of 35 to the upper cut-off of the measuring tube 2. In this case, the gauges 9 of the pump 7 should correspond to zero. Continuing to rotate the screw drive of pump 7, bring the level of the test liquid in the tank 3 to the lower edge of the vertical tube 5. The readout measured on a scale 9, at the chosen scale, determines the density of the test liquid in accordance with the expression; PiAtiC G2ID P A 1l, 4A - density of the test liquid, - density of the sample liquid, kg / m; H: || - 4), -stands,), coefficients} for measuring measures of sleep, we used to tell where the height of the measuring tube, d-fidj, is the inner diameters of the measuring tubes, m; ib Drt - internal diameters of tanks into which liquids are poured, m; ;, Di g - internal dia-. cylindrical tank meters, m; All is the difference in elevation of the level of liquids in the measuring tubes, due to their different density, m; - a predetermined (calculated) height of the level of a liquid with a known density of I (| n, m; - measured values of the heights. Formula of the invention. A device for measuring the density of fluids, containing a device for creating reduced pressure and suction tubes immersed in a waste medium, as well these parameters differ from the fact that, in order to follow the intent of intentions, the measuring tubes of the wife with tanks, cylindrical forkote which are connected by vertical channels to one of the devices for creating pressure, and The bottom of one of the measuring tubes ejects inside one of the capacitance at the factory (0.1N5DI 0.5 C), H is the height of the tank, and the lower end of vertical tubes is lowered into the same container to the level of the upper end of the falling measuring tube of the first sti. A device according to claim I, characterized in that a container into which the upper end of one of the measuring means is rough is provided with a device for indicating the level of the trunk.

Sources of information taken into account in the examination

1. Gauaner S. I, and; f. Measurement of mass, volume and density, Publishing house of standards M., 1977.

2.ABTOfCKoe certificate of the USSR N9 271О92 ЕЛ. Q O1 N 9/32, 27.O9.78 (1THOTOSH1).

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Claims (3)

Claim 1. A device for measuring the density of liquids, containing a device for creating a reduced pressure and measuring tubes _p immersed in a measuring medium, as well as means for indicating the parameters in them, characterized in that, in order to increase the accuracy of measurements, measuring the tubes are equipped with containers, cylindrical — ₄₅ , which are connected by vertical tubes to the device for creating reduced pressure, the upper end of one of the measuring tubes protruding into one of the containers in the range (0.1 C £ dM W, 5 I), where H is the height of the vessel, and the lower end of one of the vertical tubes is lowered into another vessel to the level of the upper end of the protruding measuring tube of the first vessel. _55k 2. The device pop. 1, characterized in that, the container, which includes the upper end of one of the 5 solid tubes equipped with a device for indicating the liquid level.