Emd Millipore Corporation

Antony Vanheghe

Pascal Rajagopalan

Aristotelis Dimitrakopoulos

Celine Le Ninivin

Celine Le Ninivin Glipa

Celine Le Ninivin-Glipa

Céline Le Ninivin

Céline Le Ninivin-Glipa

Aristotelis Dimitrakopoules

Disclosed is a method for analyzing the quantity of organic compounds existing in a liquid, such as ultrapure water, at the outlet from a purification device including in series a filter, an oxidizing device and a polishing device, and further including a resistivity measuring device for measuring the resitivity of water to determine the purity thereof. Only one resistivity measuring cell is used, and the outlet points of the filter and the oxidizing device are connected to the resistivity measuring cell by pipes provided with an analysis valve and/or check valves selectively enabling circulation of the liquid within them.

Device for measuring the purity of ultrapure water

This is a method for analyzing the purity of water at the outlet from a purification device. It includes the following steps: a) sending the liquid at the outlet from the filter means to a resistivity measuring cell to determine its resistivity &#x3c1;; b) establishing a reference mode by exposing a portion of the liquid to said oxidation means () during a given number of significantly different time periods; c) determining by regression the resistivity at infinity &#x3c1;of said liquid in this reference mode; d) establishing an analysis mode by causing said liquid to be analyzed to pass through the resistivity measuring cell; e) determining the resistivity at infinity &#x3c1;of said liquid in this analysis mode by successive iterations; and f) calculating the quantity of organic compounds contained in the purified liquid from this resistivity at infinity &#x3c1;and at least the values &#x3c1;and &#x3c1;.

Method and device for measuring the purity of ultrapure water

Disclosed is a device for analyzing the quantity of organic compounds existing in a liquid, such as ultrapure water, at the outlet from a purification device including in series a filter, an oxidizing device and a polishing device, and further including a resistivity measuring device for measuring the resistivity of water to determine the purity thereof. Only one resistivity measuring cell is used, and the outlet points of the filter and the oxidizing device are connected to the resistivity measuring cell by pipes provided with an analysis valve and/or check valves selectively enabling circulation of the liquid within them.

A method for the calibration of a device for measuring the total organic carbon content (TOC) of an aqueous solution by measuring resistivity. The method includes the following steps, in the presence of a reference TOC analyzer: (a) producing a calibration point by a measurement carried out on ultrapure water by the device and the analyzer; (b) producing a plurality of calibration points, each calibration point corresponding to a measurement of the resistivity of a solution having a given content of photo-oxidizable compound, by the device and the analyzer, in order to establish a correlation between the values measured by the device and the analyzer; and (c) calibrating the device by at least one algorithm, based on the measurements carried out in the previous step.

Method for the calibration of a device for measuring total organic carbon content

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.

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Asnieres sur Seine, France

Antony Vanheghe