RU1812441C - Level gage - Google Patents

Abstract

Usage: the invention relates to measuring technique and is used for continuous level measurement of liquids and solid materials. SUMMARY OF THE INVENTION: The level gauge contains two information sensors, the second being oversized in relation to the first. The information sensors can be either in the form of pressure sensors with a continuous output, or the first in the form of a pressure sensor with a continuous output, and the second in the form of a level sensor with a yes-no key output. Measurement accuracy is enhanced by introducing redundancy. 1 C.p. f-ls, 4 ill.

Description

The invention relates to instrumentation and can be used for continuous level measurement of various types of liquids .;

The purpose of the invention is to expand the scope.

Figure 1 shows a diagram of a level gauge; figure 2 - the first version of the technical implementation of the information processing unit; Fig. 3 is a diagram of a unit for measuring the specific gravity of a measured substance; Fig. 4 is a second embodiment of a technical implementation of an information processing control unit.

The level gauge (Fig. 1) contains a measuring pipe 1, two pressure sensors 2, 3, an information processing unit 4, a division unit 5, a first scale amplifier 6, an indicator 7. wherein pressure sensors 2, 3 are placed inside the measuring pipe 1 in excess of relative to each other, the outputs of the pressure sensors 2, 3 are connected respectively to the first and second inputs of the information processing control unit 4, the first and second outputs of which are connected respectively to the first and second inputs of the division unit 5, the output of which is connected to the input of the first staff amplifier 6, to the output of which an indicator is connected.

The information processing unit 4 (Fig. 2) is made in the form of an adder 8, with the first and second inputs of the logic node 4 being respectively the summing and subtracting inputs of the amplifier 6, the first and second outputs are the output and summing input of the adder 8, respectively.

The unit for measuring the specific gravity of the substance (FIG. 3) comprises a second scale amplifier 9 and a second indicator 10 connected in series

00

I

The information processing unit 4 (Fig. 4) contains AND elements 11, 12, a key element 13, a memory element 14, a HE element 15, an installation bus zero 16, while the output of the key element 13 is connected to the recording input of the memory element 14. output which is connected to the input of the element HE 15, the output of which is connected to the first input of the AND element 12, the output of which is connected to the control input of the key element 13, the zero input of the memory element 14 is connected to the zero bus 16, the first input of the information processing unit 4 are the combined first input of the element And 11 and and information input of the key element 13, the second input is the combined second inputs of the elements And 11, 12, the first output is the output of the memory element 14, the second output is the output of the element And 11 The level meter (figure 1) works as follows

way.

The amplification factors of the scale amplifiers 6, 9 are set equal to b and 1 / S 6, respectively, where S is the area of the pressure sensor element. When performing pressure sensors 2,3 in the form of sensors with a continuous output of the information processing unit 4, it has the technical implementation shown in FIG. 2. Then, at the current liquid level x (1x), the output signal of the pressure sensor 2

Pi pxlxS,

(1)

where ru. - specific gravity of the measured substance.

Pressure Sensor 3 Output

() pxSlx -pxS- 5 Pi -rk-S d.

(2)

The signals PI, Ra from the outputs of the sensors 2, 3 are fed to the first and second inputs of the information processing unit 4, in which they are fed, respectively, to the summing and subtracting inputs of the adder 8 (Fig. 2).

The output signal of the adder is 8 ye Pi -Pa px S- 5.

(3)

This signal is applied to the first input of the division unit 5, to the second input of which a signal PI is supplied. At the output of division block 5 we get a signal

ys Pi / ya Ix /. d

which is supplied to the input of the scale amplifier 6 with a scaling factor d,. The output signal of amplifier 6-uv 1x is supplied to the input of indicator 7, for example, a voltmeter, the scale of which can be calibrated in units of length.

To get value information

specific gravity p of the measured substance, the output signal of the adder 8

ye / eh s

also applied to the input of the scale amplifier 9 (Fig. 3) with a transmission coefficient of 1 / S d,. The output signal of the amplifier. .

0

5

fed to the input of indicator 10.

Thus, according to the readings of pressure sensors 2, 3, the level of substance 1X and its specific gravity px are determined.

With the technical implementation of sensor 2 in the form of a pressure sensor with a continuous output, and sensor 3 in the form of a pressure sensor with a discrete input of type yes-no (in the form of a sensor of a fixed level value), the information processing unit 4 (Fig. 4) works as follows, on the bus 16 of a certain duration, the contents of the memory element 14 are set to zero, because the contents of the memory element 14 is zero, then the signal of the logical unit at the output of the element HE 15, which is supplied to the first input of the element And 12,

 With increasing liquid level in the measuring pipe 1 from zero to d, the output signal of the sensor 2

( "5)

in the information processing unit 4, it is supplied to the information input of the key element 13 and to the first input of the I 11 element. When I d, the sensor 3 is triggered, the output signal of which (a logic unit signal) in the information processing unit 4 is supplied to the second inputs of the And elements 11, 12. The signal from the output of the element And 12 opens the key element 13. The signal from the output of the pressure sensor 2, equal to

through the open key element 13 is supplied to the input of the recording of the memory element 14, in

which he is remembered. Because if the contents of the memory element 14 are not equal to zero, then the output signal of the element NOT 15 will become equal to zero. Accordingly, the signal at the first input of the element And 12 will also become equal to zero. At the same time, the key element

13 will be closed. At the output of the element And 11 when I b signal appears

Pi / Oh-5-5

from the output of the pressure sensor 2, which is supplied to the second output of the information processing unit 4, to the first output of which the output signal of the memory element is supplied

14

f

Ryu / Ekh S d.

The outputs of the information processing unit 4 are supplied to the respective inputs of the division unit 5..

Output signal of division 5

   1 U5 Ryu

fed to the input of a large-scale amplifier b with a transmission coefficient e. The output signal of the amplifier 6 ye 3 is supplied to the input of the indicator 7, which will display the value of the level

With 1X d, the output signals of the logical node 4 are equal, respectively

Pi px-S-lx and Ryu / ox-S- 5. At the same time, the output signal of division is 5 U5 P1 / Ryu Hx / 5

fed to the input of amplifier 6, the output signal of which

U6 U5

will be displayed with indicator 7.

As a result of the use of the proposed level gauge, the range of use is expanded by measuring the levels of liquids and bulk solids of various classes.

Claims (2)

1. A level gauge comprising lower and upper pressure sensors installed in the measuring tube at fixed heights, a dividing unit, an indicator and an information processing unit, the first output of which is associated with the first input of the dividing unit, and the first and second inputs, respectively, with the outputs of the lower and upper pressure sensors, characterized in that, in order to expand the scope by providing the ability to measure liquid and bulk substances of various classes, it additionally a scale amplifier is introduced, pressure sensors are located inside the measuring tube, the second output of the information processing unit is connected to the second input of the division unit, the output of which is connected to the input large-scale amplifier, to the output of which an indicator is connected. 2. The level gauge according to claim 1, characterized in that the upper pressure sensor is made with a key output, the information processing unit is made in the form of a bus for setting zero, first and second elements AND, a key element, a memory element and an element NOT, the output of the key element connected to the entry entry of the element memory, the output of which is connected to the input of the element NOT, the output of which is connected to the first input of the first element AND, the output of which is connected to the control input of the key element, the installation input is zero the memory element is connected to the zero setting bus, wherein the first input of the information processing unit is the combined first input of the second AND element and the information input of the key element, the second input is the combined second inputs of the first and second AND elements, the first output is the output of the memory element, the second output is the output of the second element I.