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Method for measuring solution conductivity

A measurement method and conductivity technology, which is applied in the field of electrochemical measurement, can solve the problems of difficult calibration, restricting the measurement range of the conductivity cell, and affecting the measurement accuracy of the conductivity of the solution, so as to expand the measurement range and reduce the capacitive effect and polarization effect. Effect

Inactive Publication Date: 2006-08-23
黄伟忠
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Problems solved by technology

[0012] However, due to the existence of the capacitance effect and polarization effect of the conductivity cell, the above methods restrict the measurement range of the conductivity cell, affect the measurement accuracy of the solution conductivity, and make it difficult to correct when the low conductivity is measured, and the polarization effect cannot be judged. Therefore, it is not possible to give the user appropriate prompts to avoid measurement operations with large measurement errors and useful prompts for accurate measurement

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Embodiment 1

[0039] What this embodiment 1 introduces is the method for measuring conductivity of the present invention.

[0040] see figure 2 , the conductivity measurement circuit is basically the same as the existing conventional measurement circuit, and 1 is a conductivity cell. One electrode of the conductivity cell 1 is connected to the reverse terminal of the operational amplifier A, and a resistor R is connected between the reverse terminal of the operational amplifier A and the output terminal f , the positive end is grounded, and an AC square wave signal V with a stable amplitude and a half-cycle pulse width of t is added to the conductivity cell 1 i , measuring the output voltage V of the operational amplifier A 0 .

[0041] see image 3 , apply an AC square wave signal V with a half cycle pulse width t to the two poles of the conductivity cell 1 i , whose waveform is as image 3 a, by measuring the current signal of conductivity cell 1 in the range of 0-49%t in any half ...

Embodiment 2

[0047] What this embodiment 2 introduces is the method for measuring resistivity of the present invention.

[0048] see Figure 4 , The resistivity measurement circuit is basically the same as the existing conventional measurement circuit, and 1 is a conductivity cell. The two electrodes of the conductivity cell 1 are connected between the inverting terminal of the operational amplifier A and the output terminal, and the inverting terminal of the operational amplifier A is also connected with a resistor R f . The positive end of the operational amplifier A is grounded, and an AC square wave signal V with a stable amplitude and a half-cycle pulse width of t is added to the resistor Rf i , measuring the output voltage V of the operational amplifier A 0 .

[0049] see Figure 5 , apply an AC square wave signal V with a half cycle pulse width t to the two poles of the conductivity cell 1 i , whose waveform is as image 3 a, by measuring the voltage signal of conductivity ce...

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Abstract

This invention relates to a measurement method for solution conductivity, which applies an AC signal source with a semi-cycle pulse width of t to the two poles of a conduction tank to compute the conductivity or resistivity by testing the value of a X< 1 > signal of the tank at T< X1 > in the sphere of any semi-cycle 0-49%t and the value of X< 2 > at T< X2 > in the sphere of any semi-cycle 51-100% t. In this invention, when the value of X< 1 > / X< 2 > is greater than a pre-designed upper limit value or the value of X< 2 > / X< 1 > is smaller than a pre-designed lower limit, it puts forward test alarms to ask for exchanging the conduction poles of even larger conduction tank constant for even stable test to avoid measurement with greater errors.

Description

technical field [0001] The invention relates to the technical field of electrochemical measurement, in particular to a method for measuring the conductivity (resistivity) of a solution. Background technique [0002] For a long time, how to measure the conductivity of a solution has been a subject of great concern and in-depth research by measurement personnel and conductivity meter manufacturers. The conductivity of the solution in the conductivity cell can be calculated by the following formula: [0003] g=K / R [0004] Where K is the conductivity cell constant (also known as the cell constant). [0005] g is electrical conductivity, unit: S / cm. [0006] R is resistivity, unit: Ω / cm [0007] Thus, the measurement of conductivity can be converted into a measurement of resistivity. [0008] At present, the measurement methods of conductivity mainly include DC conductivity measurement method and AC conductivity measurement method. The DC conduc...

Claims

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Application Information

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IPC IPC(8): G01N27/06G01R27/22
CPCG01N27/06G01R27/22
Inventor 黄伟忠
Owner 黄伟忠
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