SU1052967A1 - Method for measuring electrical conduction of water in flow - Google Patents

Abstract

A METHOD FOR MEASURING THE ELECTRICAL CONDUCTIVITY OF WATER IN A FLOW, which consists in creating an electric field between the current electrodes and measuring the voltage drop between the potential electrodes, characterized in that, in order to improve the accuracy of the measurement, current electrodes.

Description

The invention relates to the field of measurement, in particular, to methods for measuring the conductivity of liquids.

A method is known for measuring the electrical conductivity of a fluid using a bridge method, first proposed by Kohlrausch. One of the four arms of the bridge is an electrolytic cell containing an electrolyte with two electrodes embedded in it. The bridge is powered by an alternating current from lamp sound generators. This method is used in the meter ММ34-04 С13.

A disadvantage of the known method is the need to calibrate a two-electrode electrolytic cell with standard mixtures. The customization of standard solutions that have a specific conductivity in the range of 0-1 10 C / cm is difficult and practically impossible.

Also known is a method for measuring the electrical conductivity of a fluid using a four-electrode cell. In this case, it is not the resistance between the current-carrying electrodes that is measured, but the voltage drop between the two auxiliary electrodes C 2.

The disadvantage of this method is the possibility of contamination of the monitored liquid. By impurities formed in the electrode space of the current-carrying electrodes, which occurs when measuring the electric wire (NotoS especially clean, water.

The purpose of the invention is to improve the measurement accuracy by preventing the water from becoming contaminated with impurities formed during the course of electrode processes.

This goal is achieved by the fact that in the method of measuring the electrical conductivity of water in a stream, which consists in creating an electric field between potential water, the potential is entered between the potential electrodes, and the output behind current electrodes.

It is well known that if two electrodes are placed in a liquid and a certain difference in voltage is applied, then a current will flow between them, which depends on the resistance of the liquid, the difference in applied potentials, and electrochemical processes in the near electrode space. Since the active resistance of the fluid is of interest, it takes a whole range of techniques to eliminate the other components. One of these techniques is the use of four-electrode cells. However, when measured.

produced in highly pure water, the latter is polluted with substances contained in the electrodes. - One of the methods to combat these contaminants is to create

a flow cell with high flow rates, which is not always convenient, since a large amount of measured water is required, and the correctness of the measurement will strongly depend on the flow rate. In order to avoid these phenomena, a cell has been proposed in which water is supplied by means of measuring electrodes. Water flows in two streams from the side of the current-carrying electrodes.

Thus, contaminants are released into the water after a change.

The method is illustrated by the scheme shown in the drawing.

The diagram shows the current-carrying electrodes 1 and 2J measuring electrodes 3 and 4, located between the current-carrying. The electrons are placed in the housing 5, in which water is supplied through the tube 6 and discharged through the tube 7 and 8. The circuit also shows a millivoltmeter 9, a battery of 10 elements, a galvanometer 11, a potentiometer 12, a switch 13.

The method is carried out as follows.

Water through tube b is supplied to cell housing 5, where it, divided into two streams, flows through the discharge tubes 7 and 8. A current flows through the cell, resulting from the potential difference applied to the current-carrying electrodes 1 and 2. This potential difference regulates using a potentiometer 12, connected to the circuit of the battery 10 by a switch 13; the amount of current flowing through the cell is measured with a galvanometer 11. The voltage drop due to the active resistance of the liquid is measured with a millivoltmeter having an input resistance of hundreds times the resistance.

fluid between the measuring electrodes 3 and 4. Active; the resistance of the liquid is calculated by the known formulas

The proposed method, in comparison with the base object selected for the prototype, allows to increase the measurement accuracy by preventing contamination caused by impurities resulting from electrode processes on current-carrying electrodes, which allows production of current-carrying electrodes and cheaper materials.

The economic effect, obtained during the implementation of the method, cannot be calculated in terms of money, but the implementation of the proposed method allows to determine ka3, 1052967

Honestly, high-purity waters are also used to produce more accurate control of thermal and atomic elec- trons for the observance of aquatic plants. The method allows mode-TPP and NPP,

Claims (1)

(541 (57 1 METHOD FOR MEASURING WATER ELECTRIC CONDUCTIVITY IN A FLOW, which consists in creating an electric field between current electrodes and measuring the voltage drop) I distinguish that, for the purpose of measuring, the input of water between potential leads is behind the current between potential Thus, precision tendency is carried out by electrodes, and by electrodes.