SU1229583A2 - Arrangement for measuring liquid volume - Google Patents

Abstract

The invention relates to a measurement technique and is in addition to auth. No. 432344. The purpose of the invention is to increase accuracy and reliability. The diaphragm 4 of the device, connected to the actuator 5, excites low-frequency gas pressure pulsations in controlled 1 and reference 3 vessels. The magnitude of the gas pressure pulsations in the controlled vessel I is maintained at a constant level by means of stabilization systems consisting of a pressure sensor 6, a comparison device 9, an accelerator 10 connected to the actuator 5 of the membrane 4. The latter is thus covered by a negative feedback that increases the stability of its parameters. The circuit consisting of pressure sensors 6 and 7, a multiplying device 11 and a differential amplifier 12, is an additional control loop and makes it possible to increase the stability of the first control loop, which consists of pressure sensor 6, comparison device 9, amplifier 10, and reliability measurements of the volume of a fluid that varies over a wide range. 1 il. (L KD N9 CO 00 00 to

Description

one

ten

The invention relates to a measurement technique and can be used to measure the volume contained in a container.

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

The drawing shows a diagram. liquid volume measuring devices.

The device contains a controlled vessel 1 with liquid 2, a reference vessel 3, an elastic membrane 4 with a drive 5, pressure sensors 6 and 7 placed respectively in controlled and reference vessels, an acoustic low-pass filter 8, a device 9 compared to the setpoint, an amplifier 10, multiplying device 11, differential amplifier 12, secondary measuring device 13. 20

The device works as follows.

The diaphragm 4 connected to the actuator 5 excites low-frequency puls. ° Rad K is the same factor as in formula (1) under the condition that the pressure sensors 6 and 7 are identical.

In static mode, it is as follows.

1 + K. and /

where U | ,, j is the output signal of the differential amplifier 12, arriving at the ordering device 13.

K and is the gain factor of the differential amplifier 12.

Sbfjj.

and Vr If K ,, and 1, then .-

ftbt

and,

V,

and sv,

out 2

Since V const, then where S 1 / V2 const.

If you know the volume of gas in controlled vessel 1 and its total volume, you can find the volume of the liquid.

The circuit consisting of pressure sensors 6 and 7, a multiplying device 1I and a differential amplifier 1 2 is an additional control loop. His introduction

Gas pressure control in controlled 1 25 allows to increase the stability of the peri-standard 3 vessels. The magnitude of the gas pressure pulsations in the controlled vessel J is maintained at a constant level by means of a stabilization system 1 consisting of a pressure sensor 6, a comparison device 9 with a setpoint, an amplifier 10 connected to the actuator 5 of the membrane 4.

The membrane 4 in this case appears to be covered by negative feedback, which increases the stability of its parameters. DF equalization of the statistical pressures in the vessels 1 and 3 serves as an acoustic low-pass filter 8. Signal taken from the pressure sensor} 6.

and,: K / Vf.

(one)

Where

g volume of gas in controlled

vessel 1;

K is a constant value depending on the transfer ratio of the membrane 4 with the actuator 5, the pressure sensor 6, the gain factor of the amplifier 10, and also on the static pressure.

Similarly, the signal taken from the pressure sensor 7

and K / V

Z

(2)

where Vj is the volume of the reference vessel 3; VNIIPI Order 2443/40

Productive polyp. Pr-tie, city, Uzhgorod, st. Project, 4

ten

15, 20

ie ° ° glad 2295832

K is the same coefficient as in formula (1) under the condition that sensors 6 and 7 of pressure are identical.

In static mode, it is as follows.

1 + K. and /

where U | ,, j is the output signal of the differential amplifier 12, arriving at the ordering device 13.

K and is the gain factor of the differential amplifier 12.

Sbfjj.

and Vr If K ,, and 1, then .-

ftbt

and,

V,

and sv

out 2

Since V const, then where S 1 / V2 const.

If you know the volume of gas in controlled vessel 1 and its total volume, you can find the volume of the liquid.

The circuit consisting of pressure sensors 6 and 7, a multiplying device 1I and a differential amplifier 1 2 is an additional control loop. His introduction

a new control loop consisting of a pressure sensor 6, a comparator device 9 and an amplifier 10, and, consequently, reliability in measuring a volume of a fluid that varies over a wide range. In addition, reliability is also increased due to the possibility of obtaining; signal from both the first and second circuits, and in comparison with simple duplication, the introduction of an additional circuit improves accuracy due to the implementation of an invariant transformation.

Claims (1)

Invention Formula A device for measuring the volume of fluid by av.st. No. 432344, characterized in that, in order to ensure accuracy and reliability, a multiplying device and a differential amplifier are introduced into it, the latter being connected by one input to a pressure sensor installed in a reference vessel, another input from the extruder of the multiplying device, and an output with the secondary measuring device and the first input of the multiplier device, the second input of which is connected to the sensor pressure set in a controlled vessel Circulation 705 Subscription