SU1422033A1 - Method of measuring pressure change - Google Patents

Abstract

This invention relates to a measurement technique and allows the range of measurements to be expanded. and provide a constant sensitivity over a wide range of measured pressures. The tubes of the liquid differential meter 1 are connected to closed cavities 2 and 3, hermetically separated by pistons 4.6 and syelens 5.7 into chambers A, B and C, D, respectively. The controlled tank 16 is connected via valve 15 to chambers B and D. Changing the pressure in tank 16 causes the column 1 1 of fluid in the tubes of the differential pressure gauge 1 to move towards one of the sensors 9.10 of the limiting position of column 11. When the column reaches 1I of a liquid in one of the tubes The maximum mark of this tube is reversed before the movement of column 11 in the second tube to the limit mark, after which the second tube is crossed and the first tube opens. The change in pressure in the tank 16 is characterized by the total displacement of the liquid level in both tubes of the differential pressure gauge I. 1 Il. (

Description

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The invention relates to the engineering industry to the section tested -1y.

The aim of the invention is to determine the LDHpeHHe measurement range and to provide a constant sensitive one over a wide range of pressure measurements.

 The drawing shows devices for implementing the method

The device consists of a differential liquid manometer 1, under its own, opposite to the closed cavity 2: small section of the cross section and a closed section of 3 .6 joniero section, hermetically divided into chambers. A and B with piston 4 and sflonom 5 and into cameras C with piston 6 and sylphene 7,

The knee of the differential pressure gauge 1 through the vent nl-switch 8; they are connected to the chambers A and C.,

Each knee. Difference meter 1- by

ko.akdam from sensors 9 and 10 of the maximum position of the liquid column 11, forming in the counting logic device 12 (SGA) controlling the impact for executive; mechanisms

13 and 14 ". In turn connects

either to chamber C, .. or to chamber A, while cameras B and D are connected via V 15 to the monitored capacitance tanks 1: 6:

; Vector 17 and 18 provide pressures in all chambers before the start of control and divide chamber A into B, C, and B 3, the pressure control period. The gate switch 8 may be in position I or position II.

The device works as follows:

-Before commencing control, opening the valves 17.18 and IS equalize the pressure in all chambers to a nominal value and equal to the pressure in the tank being monitored. 16 Then disconnect the chambers A and B., D C, nepe-cap 1 17 and 18, Valve 15 is left open.

When the valve switch 8 is in position I, the knee of the differential meter 1 s on which sensor 9 is fixed is connected to chamber Cj and the other co-pen, on which sensor 10 is fixed, is connected to chamber A. Counter-logic unit 12 blocks the circuit supply the actuator 14 and prepare the chains of the actuator 13 for com

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signal mutations from sensors 9 or 10 position. A change in pressure in the tank 16 causes the pistons A and 6 to move a different distance, which causes the liquid column 11 to move, when the pressure drops, for example, i jep, towards the sensor 9. As soon as the liquid column 11 reaches the sensor level $ 9, the last signal in CASE 12, which remembers it and issues a command to the actuator switching the switch-switch 8 to position II. A further decrease in pressure in the vessel 16 causes the movement of the liquid column 11 in the direction of the sensor 10,

When the liquid column 11 is reached - the sensor 10 level gives a signal to SLN 12 for the next switching of the switch-switch 8 "According to the total path, - passed by the liquid column 11 between sensors 9 and 10 and the registered SLN 12, the pressure drop is in it - 16, To control the pressure at a different nominal value, the device is adjusted to the nominal value by opening the valves 17, 18 and 15, and the valve; closing valves 17 and 18, osu-. control of pressure change is implemented. as described.

The proposed method is particularly effective in determining the total leaks., Closed volumes under excess pressure. Formula from Gain

The method of measuring the pressure change by connecting a pressure source to a liquid differential pressure meter, characterized in that in order to expand the measurement range and provide a constant sensitivity in a wide range of measured pressure, both pressure sensing tubes of the differential pressure meter are connected to a pressure source, then one of the differential pressure meters is closed , and after moving the liquid level in the second tube to the limit mark, the second pipe is blocked and opened first, then after moving the liquid level tee in the first tube to the limit mark the first tube is crossed and opened314220334

The second is drawn, while the total tubes are judged on the change in pressure and the displacement of fluid levels in both at the pressure source.

Claims (1)

other claims A method of measuring pressure change by connecting a pressure source to a liquid differential pressure gauge, characterized in that, in order to expand the measuring range and ensure constant sensitivity over a wide range of measured pressures, both pressure sensing differential pressure tubes are connected to a pressure source, then one of the differential pressure tubes is closed, and after moving the liquid level in the second tube to the limit mark, the second tube is closed and the first is opened, then after moving the liquid level in the first tube, to the limit mark, the first tube is closed and the second one is opened, while the total tubes judge the change in pressure to the movement of liquid levels in both in the pressure source.