SU1215032A1 - Apparatus for measuring liquid electrical conductance - Google Patents

Abstract

The invention relates to a measurement technique and can be used to study and control the properties of electrically conductive liquids. The purpose of the invention is to improve the accuracy - it is achieved by eliminating the shunting effect of the resistance of the analyzed capacitance between the high-potentiated and sensible electrodes on the secondary winding of the transformer. The device contains a generator 1, feeding through the winding 2 two transformer bridge (TM). The first TM is formed by the halves of the secondary winding 3 of the transformer 4, the electrodes 5 and 6 of the converter 7 in one arm and the adjustable measure 8 of the complex conductivity in the other. The second TM is formed by the winding halves 9, the electrodes 5 and 10 of the transducer 7 in one arm and an adjustable measure of the impedance 11 in the other. The balance indicators are 12 and 13. TM balancing is carried out by adjusting the elements 8 and 1. 1 sludge. (L S U3J lg jt l: Wu j ate about so w.

Description

one

The invention relates to a measurement technique and can be used in the study and control of the properties of electrically conductive liquids.

The purpose of the invention is to improve the measurement accuracy by eliminating the shunting effect of the resistance of the analyzed fluid between the high-potential and guard electrodes on the secondary winding of the transformer.

The drawing shows a block diagram of a device for measuring the electrical conductivity of a liquid.

The device contains an alternating current voltage generator 1, supplying two TMs through the winding 2, the first of which is formed by the halves of the secondary winding 3 of the transformer 4 by high-potential 5 and low-potential 6 electrodes of the three-electrode converter 7 in one arm and adjustable measure 8 of complex conductivity in the other, second The TM is formed by the halves of the additional winding 9, the high-potential 5 and the guard 10 electrodes of the converter 7 in one arm and an adjustable measure 11 of the complex resistance in the other, one ind balance locator 12 included in the first diagonal of TM, and another auxiliary nsh balance indicator 13 included in the second diagonal TM.

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The balancing of bridges is carried out by changing the regulated measures 8 and 11 of the complex conductivity. and resistance, respectively, until reaching zero readings with balance indicators 12 and 13. With the TM balance, the readings of the active component of the regulated measure 8 of the complex conductivity correspond to the conductivity value of the analyzed liquid. The complete elimination of leakage currents from the electrical circuit of the first TM is achieved as a result of the performance by the same number of turns of the secondary winding 3 and the additional winding 9 of the transformer 4 ensuring equal amplitude and phase of the voltages acting on the low-potential 6 and the guard 10 electrodes of the converter 7. In addition , the selection of the corresponding dimensions of the guard electrode 10 of the converter 7 ensures, with the TM balance, the same density of power lines

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electric current in the volume of the analyzed fluid between the high potential 5 and Inexcidental b electrodes (the permeability of this volume of the analyzed fluid is measured) and in the immediately adjacent part of the volume of the analyzed liquid between the high potential 5 and the guard 10 electrodes of the converter 7, i.e. complete shielding of the volume of the analyzed liquid, the conductivity of which is measured. Performing additional winding 9 in the form of an electrostatic secondary screen

winding 3 of the transformer 4 in connection with an adjustable measure 11 provides complete shielding of the remaining elements of the electric circuit of the first TM.

Thus, the introduction of an additional winding, made in the form of an electrostatic screen of the secondary winding of a transformer, makes it possible to completely separate the currents flowing

through the guard and low-potential electrodes of the converter, as a result of which the maximum sensitivity of the main TM and, consequently, an increase in the accuracy of measuring the conductivity of the liquid, is achieved.

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Claims (1)

Invention Formula A device for measuring the electrical conductivity of a liquid, containing a generator connected to the primary winding of a transformer, a transformer bridge formed by two secondary windings of a transformer, a three-electrode converter with high-potential, low-potential and guard electrodes and an adjustable measure of complex conductivity, a balance indicator connected by a first input to the first the top of the measuring diagonal of the transformer bridge, to which the first terminals of the secondary windings are also connected transformer, adjustable measure of impedance and auxiliary balance indicator, characterized in that, in order to improve measurement accuracy, two additional windings are introduced into the transformer, made in the form of an electrostatic screen of secondary windings, the second terminal of the first secondary winding of the transformer is connected to low 2 have the electrode of the three-electrode converter, the high-potential electrode of which is connected to the common bus, the first output of the regulated measure of complex conductivity is connected to the common bus, and the second output to the second output of the second secondary winding of the transformer, the first output of the first additional winding is connected to the guard electrode of the three-electrode converter . Compiled by V.Semenchuk Editor A.Lezhnina Tehred Z.Kastelevich Proofreader V. Sinitska “-. - --- - - - - "". "" ". Order 902/52 Circulation 730 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Branch 11PP Patent, Uzhgorod, 4 Project St. 15032Л nepBbrfi the output of the second auxiliary winding — with the first output of an adjustable measure of impedance, the second output of which is connected to the common ground; the first input of the auxiliary balance indicator is connected to the second outputs of the additional windings, and the second input — to the common bus, to which the second input is also connected balance indicator.