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Method and device for measuring the conductivity of a pure or ultrarapture liquid

A conductivity and liquid technology, applied in the field of measuring pure or ultra-pure liquids, to achieve the effect of accurately measuring conductivity

Active Publication Date: 2010-01-20
MILLIPORE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because of their small size, it has been found that with microelectrodes a large capacitive effect can be produced which can no longer be ignored

Method used

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  • Method and device for measuring the conductivity of a pure or ultrarapture liquid
  • Method and device for measuring the conductivity of a pure or ultrarapture liquid
  • Method and device for measuring the conductivity of a pure or ultrarapture liquid

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Embodiment Construction

[0048] It should be noted that the following description is given by way of non-limiting examples.

[0049]To measure the conductivity of a pure or ultrapure liquid, such as water, it needs to be modeled with an equivalent circuit diagram representing the battery-solution interface and the electrical properties of the liquid.

[0050] The electrical effects of connecting wires between the electrodes and the surrounding electrical system are also considered and modeled by capacitors.

[0051] The resistance of the model on the 1 ohm scale is negligible compared to the resistivity of pure or ultrapure liquids.

[0052] Next, the model can be modified and passed according to the present invention figure 1 The shown equivalent circuit 10 models a liquid. The equivalent circuit includes a capacitor 11 in series with a parallel connected combination of a capacitor 12 and a resistor 13 .

[0053] By following the general Figure 14 ( figure 2 ) method to determine the conductivit...

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Abstract

The invention relates to a method of measuring the conductivity of a pure or ultrapure liquid, notably water, using electrodes, characterized in that it consists in determining the conductivity by modeling the liquid in the form of an equivalent electrical circuit diagram comprising a resistor R, a capacitor Cp in parallel with the resistor R, and a series capacitor Cs. It also relates to a device for implementing this method and a purification system incorporating such a device.

Description

technical field [0001] The invention relates to a method for measuring the electrical conductivity of pure or ultrapure liquids, especially water. Background technique [0002] Measuring the conductivity of liquids is important in many industrial fields where ultrapure water is used, especially in the chemical, pharmaceutical, medical and electronics industries. [0003] The conductivity of an aqueous solution is measured by measuring the electrical resistance in the solution across a conductivity measuring cell, which typically comprises at least two parts of conductive material forming electrodes. [0004] A conductometric measuring cell is defined by its cell constant, which proportionally relates the measured resistance to the conductivity of the solution. The cell constant determines the accuracy of battery measurements. Therefore, a cell with a low constant is required to measure the conductivity of ultrapure liquids. [0005] The conductivity measurement is affecte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/06
CPCG01N33/18G01N27/06
Inventor P·拉贾戈帕蓝A·迪米特拉科普洛斯C·勒尼尼温A·范海赫
Owner MILLIPORE CORP