SU1291859A1 - Device for measuring conductivity of stratified liquids - Google Patents

Abstract

The invention relates to a measurement technique and can be used in oceanology for the study of the fine static structure of ocean waters, in industrial conductometry and metrology in the calibration of pulsation transducers of the specific electrical conductivity of liquids. The purpose of the invention is to increase the spatial resolution of the device. For this, a pair of slotted electrodes is additionally introduced into the device. The sensitive area of the device is formed as a thin flat lobe oriented perpendicular to the direction of fluid flow through the chamber. The surface area of the electrodes yE1 is lengthened, and the dimensions i of the sensitive zone remain unchanged. A large cross-sectional area and symmetry of the flow chamber is provided. 1 hp f-ly, 3 ill. Q% S (L

Description

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The invention relates to a measurement technique and can be used in oceanology to study the fine thermohaline structure of ocean waters, industrial conductometry and metrology when calibrating pulsation transducers of the specific conductivity of liquids. The purpose of the invention is to increase the resolution of the device when measuring in the direction of flow, - FIG. 1 shows the structure of the device; figure 2 - distribution of lines of force of the electric field in the volume of the flow chamber; on fig.Z - the form of the sensitive area of the device.

The device comprises a flow dielectric chamber 1 with a channel of a rectangular cross section. Flat electrodes 2 and 3 opposite each other are mounted on the opposite faces of the channel. Inside the channel, parallel to electrodes 2 and 3 at the same distance from them, flat electrodes 4 and 5 are installed, in the middle area of which slot holes 6 are made. Recorder 7 is connected to electrodes 3 and 5. Electrodes 2 and 4 are closed and through alternating source 8 soy stress

: dinene with electrode 5. Chamber 1 is oriented in the direction of fluid flow 9 or perpendicular to the layering of fluid so that it is stratified12

on the structure during movement crosses the sensitive zone 10 of the device.

The device works as follows.

When chamber 1 is filled with liquid 9, several bulk electrical circuits between electrodes 2-5 are simultaneously closed. Between the electrodes 4 and 5 there are two areas of flow of ion current, due to the intensity of the field E, and interconnected in the region of the gap 6, the electric field E, similar to the field of a flat capacitor. Electrode 2 has the same potential as electrode 4 and therefore there is no current between them. Electrode 5 is connected to electrode 3 through a low-impedance current recorder 7 and therefore there is practically no current between them. Consequently, the current flowing in the circuits of the electrodes 2 and 3 is closed through the slit holes 6 in the electrodes 4 and 5 and through the sensing zone 10,

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Due to the constant flux of the vector of the electric field in the liquid and the difference of the areas of the electrodes 2 and 3 and the slit holes 6, the intensity of the field E in the area 10 is many times greater than the intensity of the field Ej near the electrodes 2 and 3. Thus, sensitive zone 10, the overwhelming part of the resistance of which is concentrated in the region in the form of a thin flat lobe across the entire width of chamber 1 between the slit holes 6. A slight value of the intensity of the field E near the electrodes 2 and 3 decreases a contact effect phenomena on the surface on the fluid resistance in a sensitive area.

An increase in the area of the electrodes 2 and 3 by a factor of 10 or more as compared with the area of the slotted holes 6 further reduces the influence of the contact effects.

Due to the symmetry of the location of the electrodes 4 and 5. relative to the electrodes 2 and 3, the entire current of the electrode 14 is closed on the electrode 5 without affecting the sensitive zone 10 and during operation of the device does not flow through the recorder 7, which measures the current flowing directly through the sensitive area of the device.

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Claims (2)

Invention Formula 1, A device for measuring the conductivity of a stratified: fluid containing a flow dielectric chamber with three metal electrodes arranged inside it, two of which are interconnected, an alternating voltage source and a recorder, characterized in that, in order to increase the resolution of the device when measuring x in the direction of flow, it is equipped with a fourth electrode, while the flow chamber is made in the form of a rectangular channel, on opposite faces of which the mouth Credited per- vy and second planar electrodes and the third and fourth planar electrodes are identical and are mounted within the chamber parallel to the first and second electrodes at an equal distance from them over the entire width of the channel, wherein h; in the middle part, the third and fourth electrodes have slotted holes located opposite each other, oriented perpendicular to the channel axis, the first and third electrodes are interconnected and connected to one of the terminals of the alternating voltage source, and the remaining two electrodes connected to the terminals of the recorder, while the other terminal of the source of alternating voltage is connected to the fourth electrode. 2. The device according to claim 1, characterized in that the area of the slit holes is at least 10 times smaller than the area of the first electrode. fig.Z Editor I. Derbak Compiled by Y. Gridnev Tehred L. Oleinik Order 225/42 Circulation 777 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35., Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proof-reader I.Erdeyi