SU1413455A1 - Device for measuring pressure - Google Patents

Abstract

The invention relates to instrument engineering and is intended to measure the pressure and pressure drop of gases, vapors and liquids. The aim of the invention is to increase the sensitivity, accuracy and reliability of the measurement. This is achieved by introducing a drainage system into the device and filling the supermembrane and submembrane cavities, which allows them to be washed, cleaned and filled. The system through the valve 17 is filled with the test substance. As measure

Description

(L

with

4: SL SP

The temperature in it, and consequently, the pressure, the membrane 9 bends, and the core 13 of the inductive converter 5 moves, which leads to an imbalance in the bridge circuit. To compensate for the unbalance under the membrane 9, water is supplied through the separator, which transmits pressure from the deadweight pressure gauge. At the time of compensation, the pressure is measured by the column. The flanges of the body, between which the membrane is fixed, are made perforated-1Ч. A water cooler is located between the tube and the inductive transducer, which reduces the size of the device by reducing the length of the rod, which transfers movement from the membrane to the transducer. 2 il., 2 s.p. f-ly.

one

The invention relates to instrument engineering and is intended to measure the pressure and pressure drop of gases, vapors and liquids.

The aim of the invention is to increase the sensitivity, accuracy and reliability of the measurement.

FIG. 1 shows a general scheme of the device; in fig. 2 shows a transducer for moving a membrane into an electrical signal.

The device comprises a housing 1, a liquid backpressure system and a tracking system for controlling the movement of the membrane.

The counterpressure system consists of a liquid separator vessel oil-water 2, a cargo piston manometer 3 with a measuring column 4. Distilled water is used as a separating liquid filling the submembrane cavity.

The following system is formed by induk-. Optically-converter of the membrane movement into an electrical signal in the form of an inductive differential transformer sensor 5 and a bridge circuit 6.

Case 1 (Fig. 2) consists of the upper 7 and lower 8 flanges, between which a membrane 9 is clamped, with the formation of supramembrane and submembrane cavities.

The flanges have channels for communication of the membrane cavities with a filling and draining system, as well as perforations in the central part. A thick-walled tube is attached to the flange 8 of the gesture.

10 passing through the bottom of the thermostat.

11, inside of which is placed a thin rod 12 with a ferromagnetic core 13 at the end. Kernel

pressed against the membrane 9 with a light spring 14. A water cooler 15, located between the bottom flange 8 and the converter 5, provides for the cut-off of the high temperature zone of the thermostat from the coils 16 of the inductive sensor 5. The valves 17 and 18 cut the membrane strips from the filling and draining systems, and also serve to equalize pressure with both

their sides of the membrane 9 (zero setting) at the time of establishing its neutral position during calibration of the converter and measurements. The supra-membrane cavity communicates with

Coy (not shown) with the test substance.

The device works as follows.

The system through valve 17 is filled with the test substance. As the temperature tends to change in it, and consequently, in pressure, the membrane 9 bends and the core 13 connected with it moves, which leads to an imbalance in the bridge circuit. To compensate for the unbalance, under the membrane 9, through the separation vessel 2, water is supplied, which transmits the pressure from the press of the piston pressure gauge 3. At the time of compensation, the pressure is measured by column 4.

The device provides increased sensitivity, accuracy and

reliability and additionally - improved

Claims (2)

Claim 1. A device for measuring pressure, comprising a housing, between the two flanges of which a membrane is fixed with the formation of a supmembrane and submembrane cavities, while one of the cavities is in communication with the cell with the medium under study, and the other cavity is communicated using a tube fixed in the housing with a back pressure system , and an inductive converter for moving the membrane into an electric signal, characterized in that, in order to increase the sensitivity, accuracy and reliability of measurement, a cavity filling and draining system is introduced a liquid with two valves, the supranembrane cavity communicating with the cell, and the submembrane cavity with a back pressure system, which is liquid, and in each flange of the casing above the peripheral region of the membrane there is one channel communicating the supmembrane and submembrane cavities with a corresponding valve, and the flanges of the casing above the central part of the membrane are perforated. 2. The device according to claim 1, characterized in that, in order to reduce the size, it is equipped with a water cooler covering the tube and located between the housing 25 and the inductive converter. FIG. 1