CN104483555A

CN104483555A - Electrode oscillating type liquid conductivity measurement method

Info

Publication number: CN104483555A
Application number: CN201410830508.4A
Authority: CN
Inventors: 廖晓东; 陈顺凡; 石兆英
Original assignee: Fujian Normal University
Current assignee: Fujian Normal University
Priority date: 2014-12-26
Filing date: 2014-12-26
Publication date: 2015-04-01
Anticipated expiration: 2034-12-26
Also published as: CN104483555B

Abstract

The invention discloses an electrode oscillating type liquid conductivity measurement method. A measured liquid rapidly passes through a gap between two electrode tips back and forth by means of an oscillating mechanism to scour surfaces of the two electrode tips, ions cannot be gathered and attached to the surfaces of the measured electrodes, stable double electrode layers cannot be formed, and accordingly, electrode polarization is avoided; and direct voltage easy to implement is adopted for excitation, a test method and a calculating method are simple and reliable, influence of distributed capacitance between electrodes and between electrode leads is not required to be considered, and the anti-interference property is very high.

Description

A kind of electrode swing type liquid electric conductivity measuring method

Technical field

The technical program relates to the measuring method of liquid electric conductivity or resistivity, particularly relates to and can eliminate electrode polarization completely and the liquid electric conductivity or the method for measuring resistivity that adopt continuous-current excitation.

Background technology

The measurement of liquid electric conductivity widely uses in the numerous areas such as commercial production, water quality monitoring.The fundamental method of measurement of electrical conductivity of solution measures the voltage U be applied on the two ends of the electrode of inserting solution and the electric current I flowing through electrode, and calculate the resistance R=U/I between electrode, calculate the conductivity of solution with G=K/R, wherein K is electrode constant.But the electrode of inserting in solution can produce polarization after powered up, the voltage U recorded is made not to be in fact the voltage at the two ends of solution own, but the voltage be applied on solution resistance series connection electrode polarization equivalent capacity two virtual electronic devices, therefore there is theoretical error in formula R=U/I; In order to reduce the impact of electrode polarization on accuracy of measurement, conventional method is that alternating current such as the sine wave applying positive-negative polarity symmetry on electrode encourages, but ac-excited method just can reduce electrode polarization impact, can not eliminate the impact of electrode polarization completely, and ac-excited electrode interelectrode capacity and the contact conductor electric capacity can introduced is to the adverse effect measured.

Summary of the invention

The object of the technical program be to provide a kind of eliminate electrode polarization completely and adopt continuous-current excitation liquid electric conductivity measuring method.

The technical scheme realizing above-mentioned purpose is: a kind of electrode swing type liquid electric conductivity measuring method, comprises following steps: 1, two of potential electrode electrode tips i.e. the first electrode tip, the second electrode tip is placed in the conductance cell holding fluid to be measured completely; 2, tilting mechanism starts, and drives horn and two electrode tips i.e. the first electrode tip, the second electrode tip to swing fast back and forth in fluid to be measured, makes fluid to be measured pass rapidly through gap between two electrode tips i.e. the first electrode tip, the second electrode tip; 3, two nodes by being positioned at the connection terminal at the swinging center position of tilting mechanism apply constant direct energizing voltages; 4, the DC current of fluid to be measured is flowed through with reometer measurement; 5, the electrode constant in conjunction with potential electrode calculates conductivity;

Metering circuit connects: two nodes of connection terminal are connected to constant pressure source and reometer by cord, and the current loop of formation is: the positive pole of a constant pressure source--node of connection terminal--the first electrode tip--fluid to be measured--the second electrode tip--another node of the connection terminal--positive pole of the reometer--negative pole of reometer--negative pole of constant pressure source--positive pole of constant pressure source.

The innovative point of the technical program is: tilting mechanism swings and makes fluid to be measured pass rapidly through gap between two electrode tips, souring is formed to two electrode tips, therefore ion can not be assembled and adhere in potential electrode surface to form firm electrostatic double layer, avoid electrode polarization, the DC voltage easily realized is adopted to encourage, without the need to considering the impact of the distributed capacitance between electrode interpolar and contact conductor, anti-interference is extremely strong.

Accompanying drawing explanation

Fig. 1 is the hardware system schematic diagram comprising the front view of liquid conductivity measurement electrode involved by the technical scheme of the application.

Fig. 2 is the hardware system schematic diagram comprising the left view of liquid conductivity measurement electrode involved by the technical scheme of the application.

Embodiment

further describe below in conjunction with the technical scheme of accompanying drawing to the application:

In Fig. 1 and 2, two electrode tips of 1 and 2 expression potential electrode, be called the first electrode tip 1 and the second electrode tip 2, 3 represent horn, 4 is tilting mechanisms, 5 is electric connecting wires, 6 is connection terminals, i.e. the first electrode tip 1 of two electrode tips, second electrode tip 2 is flat metal sheets, be parallel to each other and leave gap, faced by honest, i.e. the first electrode tip 1 of two electrode tips, second electrode tip 2 is fixedly installed in horn 3 and is mechanically connected to tilting mechanism 4 by horn 3, i.e. the first electrode tip 1 of two electrode tips, second electrode tip 2 is electrically connected to the connection terminal 6 at the swinging center position being positioned at tilting mechanism 4 by the boring that electric connecting wire 5 passes horn 3, electric connecting wire 5 comprises two, connection terminal 6 comprises two nodes, first electrode tip 1, second electrode tip 2 is connected to the respective corresponding node in two nodes of connection terminal 6 each via an electric connecting wire 5.

Circuit connects: two nodes of connection terminal 6 are connected to constant pressure source E and reometer A by cord, and the current loop of formation is: the positive pole of a constant pressure source E--node of connection terminal 6--the first electrode tip 1--fluid to be measured--the second electrode tip 2--another node of the connection terminal 6--positive pole of the reometer A--negative pole of reometer A--negative pole of constant pressure source E--positive pole of constant pressure source E.

The step measuring liquid electric conductivity is: 1, two of potential electrode electrode tips i.e. the first electrode tip 1, second electrode tip 2 is placed in the conductance cell holding fluid to be measured completely; 2, tilting mechanism 4 starts, and drives horn 3 and two electrode tips i.e. the first electrode tip 1, second electrode tip 2 to swing fast back and forth in fluid to be measured, makes fluid to be measured pass rapidly through the gap of two electrode tips that is between the first electrode tip 1, second electrode tip 2; 3, two nodes by being positioned at the connection terminal 6 at the swinging center position of tilting mechanism 4 apply constant direct energizing voltages and constant pressure source E; 4, the DC current of fluid to be measured is flowed through with the measurement of electric current Table A; 5, the electrode constant in conjunction with potential electrode calculates conductivity.

Claims

1. an electrode swing type liquid electric conductivity measuring method, is characterized in that comprising following steps: 1, two of potential electrode electrode tips i.e. the first electrode tip, the second electrode tip is placed in the conductance cell holding fluid to be measured completely; 2, tilting mechanism starts, and drives horn and two electrode tips i.e. the first electrode tip, the second electrode tip to swing fast back and forth in fluid to be measured, makes fluid to be measured pass rapidly through gap between two electrode tips i.e. the first electrode tip, the second electrode tip; 3, two nodes by being positioned at the connection terminal at the swinging center position of tilting mechanism apply constant direct energizing voltages; 4, the DC current of fluid to be measured is flowed through with reometer measurement; 5, the electrode constant in conjunction with potential electrode calculates conductivity;