Abstract: The present patent application relates to a device (1) for measuring the conductivity of a liquid, which comprises a measuring chamber for containing a sampling volume to be irradiated with UV rays formed in a hydraulic body (4) which comprises an inlet channel for feeding the measuring chamber with liquid to be measured and an outlet channel for removing the measured liquid from the measuring chamber, the inlet channel and the outlet channel emerging on either side beyond a surface exposed to the UV rays, such that only the sampling volume contained in the measuring chamber is irradiated. The present patent application is also directed towards a use of such a device and to a purification system comprising such a device.

Abstract: The present patent application relates to a device (1) for measuring the conductivity of a liquid, which comprises a measuring chamber for containing a sampling volume to be irradiated with UV rays formed in a hydraulic body (4) which comprises an inlet channel for feeding the measuring chamber with liquid to be measured and an outlet channel for removing the measured liquid from the measuring chamber, the inlet channel and the outlet channel emerging on either side beyond a surface exposed to the UV rays, such that only the sampling volume contained in the measuring chamber is irradiated. The present patent application is also directed towards a use of such a device and to a purification system comprising such a device.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to a method for the calibration of a device for measuring the total organic carbon content (TOC) of an aqueous solution by measuring resistivity, comprising the following steps, in the presence of a reference TOO analyzer: (a) Producing a calibration point by a measurement carried out on ultrapure water by said device and said 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 said device and said analyzer, in order to establish a correlation between the values measured by said device and said analyzer; and (c) Calibrating said device by at least one algorithm, based on the measurements carried out in the previous step.