RU5025U1 - DEVICE FOR MEASURING THE LEVEL OF ELECTRIC CONDUCTING MEDIA - Google Patents

Abstract

1. A device for measuring the level of electrically conductive media, comprising a recorder, measuring and compensation electrodes immersed in a vessel with a test medium, connected to the inputs of a capacitor transducer, characterized in that the electrodes are located in separate cylindrical vessels of different diameters interconnected, made of conductive material, moreover, to the electrode immersed in a vessel of a larger diameter, an additional capacitance configured to adapt is connected in parallel. 2. The device according to claim 1, characterized in that the measuring and compensation electrodes are made insulated. The device according to claim 1 or 1 and 2, characterized in that the measuring and compensation electrodes are installed at the same distance from the bottom of the vessels.

Description

DEVICE D.1YA MSfvL PSHIlfi ELECTRIC WIRING LEVEL

The utility model relates to instrumentation and measurement technology, namely, to devices for measuring the level of electrically conductive media.

A device for determining the level of electrically conductive liquid in a metal tank / A. With "USSR j 171S912, MKI: 601F 23/24 /, containing a level sensor made in the form of a metal tube plugged from the bottom end with two insulated electrodes fixed to the plug, source power supply, indg-psator, bipolar switch and electrical instrument. The electrodes are made in the form of a thermocouple and are connected to the input of the switch. To one of the entrances of the crossing and atelier. connected to electroism / Akhi 1ny device, to a friend, is one of. inputs t ndjakator "g one of the outputs of the power source. The second input of the indicator and the second output of the power source are connected to the tank.

However, the described device, designed to control the detected level, cannot be used to measure any changing level.

Known capacitive compensation level gauge / A.O. GOOP% 1695139, 1ZHI: 601P 23/28 /, containing measuring and compensation sensors, a generator, two capacitance-to-voltage converters, each of which includes an operational amplifier and a capacitor, two subtraction schemas, two scale regulators, an indicator, two voltage dividers , two voltage to frequency converters and a frequency divider. In this case, the output of the generator through the regulators of the general staff is connected to

W G01P 23 / 00.23 / 24

the first inputs of the subtraction circuits and the inputs of the voltage dividers, the output of which is connected to the non-inverse inputs of the operational amplifiers of the capacitance-to-voltage converters The outputs of the last subconnections are connected to the second inputs of the subtraction circuits whose outputs are connected to the two inputs of the frequency divider through voltage-to-frequency converters. The third input of the frequency divider is connected to the output of the generator, and the output to the input of the indicator.

A disadvantage of the described device is the neglect of the capacitance of the unsaved part of the sensor, which causes either an increase in the error at low levels or a narrowing of the dynamic range of measurement.

, the coarseness of a cylindrical sensor of height i- with the radii of the cylinders rg B, p, fixed to level X with a liquid about permeability (5 ..

OrsDg.

G - I a - /) Y 7

   I At -Ql d. Cf.yb..V) S /.X

-f 02 b .. (3-) -. /

/

where is the perfect / true environment,

 - measurement error

But in this case, the 20 sensor capacitance must be filled with water until measurement

Closest to the claimed is a device for measuring the level of electrically conductive saavd / Yu.M. KeliMo Elekt romechanical and magnetic elements of automation systems. -ivU, BHcni. Hack. ,, 1991, C.8S./, containing a generator, a recorder, measuring and compensation electrodes immersed in a vessel with a research medium, connected to the inputs of the capacitor transducer.

ycTpol.icTBa

The goal is to increase accuracy and expand the measurement range due to the elimination of the missing attracting capacity of the empty part of the sensor

This goal is achieved by the fact that in the device for measuring the level of electrically conductive media, containing a recorder, measuring and cohesive electrodes immersed in a vessel with the medium under study, connected to the inputs of the cooler, the electrodes are located in separate communicating with each other shld111 vessels of various diameters made of conductive material, moreover, to the electrode immersed in soybeans with a larger diameter, an additional capacitance made with the possibility of fine tuning is connected in parallel.

In addition, the measuring and compensation electrodes are made insulating w from vessels.

In addition, HSMspHTevibHH to co-potentiation electrodes are installed at an odd distance: from the bottom of the vessels,

A useful model is illustrated in the drawing, where on v..l the construction of the mouth of the procedure is shown, in Fig.2 is a diagram of its inclusion.

The positions in the drawings indicate: the body of cylindrical interconnected vessels - 1, measuring electrode - 2, compensation electrode - 3, add additional capacity - 4, generator 5, recorder - G transducer e-t; awns - 7

case 1 in the form. The device contains a total of cylindrical vessels of different diameters made of conductive

material, measuring 2 and compensation 3 electrodes, one

of a larger yaiai-liter of which is immersed in a vessel under the studied medium

body capacity; internal with the possibility of adjustment Measuring 2 / co /: peksag1.onzh 3 electrodes made insulated from the vessels to / at the same distance from their bottom, connected to the inputs of the converter of readiness.

 id of the forwarder e.kost. connected regkst-latr.

.4.

consisting of c / p where ac as where CBC is Sun Electtric: vessel capacity with coherent electrodes um of two components El.-Yu.tsmkh С, „С n-С; ,, g /, with cao ac С, - the capacity is filled parts of the vessel, O; l: 1 of its dca1y: etra, C- ,, - unfilled parts of the vessel / .a, larger diameter, d, UL - B icoTa of the vessel, X - height of the liquid column in the vessel. (YES, S. & lj fof / il.K) / K, X I / T G., - electrical permeability of Baku: / 1a, air and medium; / liquid filling the sensor / o, respectively .., c / - thickness. lyojuj I laii on the electrode c. 05. Ki - I'm D. (а - 2 4 i 1 - radius of electrodes. / radii of communicating vessels By analogy for another vessel: Aerib-joro d lameter / - А / - - - (f // rjx-j Aj / Гз

The difference in capacities is equal to: Sae-SVS / K2gKz / L X

And it does not depend on //, Therefore, in the proposed sensor, the capacities of the unfilled parts of both vessels cancel each other out and do not affect the level measurement result. Moreover, @ just eliminated the cause of the error that appears due to neglecting the capacity of the unfilled vessel, but also removed

associated with this restriction to the minimum value of the ratio X / L. It can be made less than 0.1 by expanding the measurement range to the side of the “first level” value.

Capacitance converter: can be performed, for example, in a divider for resistances, powered by a generator 5 connected between a common point of capacitances C to C, / a vessel body / and a common point of resistances N / and 2 Resistance -, and VAest with an integrated circuit С and C ,, form a classic bridge, catering (dC-VO

from the generator 5 Capacities of loans С ,,., and С., form one

cuvo

adjacent pair of shoulders of the bridge. The other C1u.bridge pair of shoulders of the bridge is formed by the resistances f and 2 selected conditions, / z. /% This should provide b-l; c -: skeleton at zero; ; fovne / absence / environment / for example, shortness / s However, in practice, full balance is not obtained due to the difference in the end capacitances of the measuring and the companion: the electrodes are uniquely bottom Razlchchaye is not large but it is and can be compensated when connected to the electric in the vessel the larger diameter of the additional triad ei-w.ocTK С In this case, the change in the output voltage //.uv is proportional, wll оJIll 4-A.

The difference in capacitance is S.- .., the level X and the volume /% X, where K, Kr, k,.

O. OkhzO constants., | У.Й

Claims (3)

1. A device for measuring the level of electrically conductive media, comprising a recorder, measuring and compensation electrodes immersed in a vessel with a test medium, connected to the inputs of a capacitor transducer, characterized in that the electrodes are located in separate cylindrical vessels of different diameters interconnected, made of conductive material, moreover, to the electrode, immersed in a vessel of a larger diameter, in parallel is connected an additional capacitance made with the possibility of adjustment.  2. The device according to claim 1, characterized in that the measuring and compensation electrodes are made insulated. 3. The device according to claim 1 or 1 and 2, characterized in that the measuring and compensation electrodes are installed at the same distance from the bottom of the vessels.