Neroxis Sa

Belenos Clean Power Holding Ag

Veolia Water Solutions & Technologies Support

Veolia Eau, Compagnie Generale Des Eaux

Yves De Coulon

Carine Beriet

Cyrille Lemoine

Vincent Demarne

Philippe Niedermann

Olivier Chetelat

Emmanuel Onillon

Carine Beriet Herrera

Marc Brodard

The invention concerns a device for measuring the pH of an effluent, said device comprising means for measuring an item of information representative of the pH of said effluent intended to be brought into contact with said effluent. According to the invention, such a device further comprises means for modifying the pH value of said effluent close to said means for measuring.

PH value measuring device comprising in situ calibration means

The described sensor allows determination of the concentration of a gas in a two-component mixture at variable pressure by measuring the diffusivity and the thermal conductivity. The sensor is provided to alternately heat the membrane of a thermally conductive cell and allow it to cool such that the temperature Tof the membrane passes from a first stable value to a second stable value and vice versa via a transient mode. The cell produces a signal representative of the temperature Tof the membrane and the sensor extracts from the signal a first and a second parameter that respectively relate to said first stable value and said transient mode of the signal. A value of the concentration of said gas and of the pressure of said two-mixture is calculated from these two parameters.

Gas sensor and method for determining a concentration of gas in a two-component mixture

An amperometric sensor circuit for measuring chlorine concentration in water. The circuit includes first and second working electrodes coated with a hydrophilic membrane. A power supply and biasing circuit is configured to deliver a generally constant voltage between the first working electrode and a reference electrode and to generally deliver a constant current between the second working electrode and a counter electrode. A measurement circuit measures the current between the counter electrode and the first working electrode. A processing circuit is provided for determining the chlorine concentration based on the current measured by the measurement circuit.

Device for measuring the free chloride content of water

The described sensor allows determination of the concentration of a gas in a two-component mixture at variable pressure by measuring the diffusivity and the thermal conductivity. The sensor is provided to alternately heat the membrane () of a thermally conductive cell () and allow it to cool such that the temperature Tof the membrane passes from a first stable value to a second stable value and vice versa via a transient mode. The cell produces a signal representative of the temperature Tof the membrane and the sensor extracts from the signal a first and a second parameter that respectively relate to said first stable value and said transient mode of the signal. A value of the concentration of said gas and of the pressure of said two-mixture is calculated from these two parameters.

An amperometric electrochemical sensor with a fixed potential used in a probe for measuring the content of an oxidation reduction substance dissolved in a liquid, in particular the chlorine content. The sensor () includes an insulating substrate (), a set of electrodes consisting of a working electrode (), an auxiliary electrode () and a reference electrode, at least one of the working electrode () and auxiliary electrode () being configured on the insulating substrate (). At least one of the working electrode () and auxiliary electrode () is covered with an insulating layer (), the insulating layer () including at least one opening exposing at least one of the working electrode () and auxiliary electrode ().

Amperometric electrochemical sensor and method for manufacturing same

A sensing probe intended to measure the content of an oxygen reducible substance in a fluid, includes:

Amperometric in-pipe electrochemical sensing probe

A physical gas sensor of thermal type capable of determining the concentrations of a gas mixture even in the presence of humidity by measuring the thermal diffusivity and conductivity includes a cell with thermal conductivity whose frequency response to the gases is known, in particular in respect of humidity, delivering a signal Vm representative of the concentration of the gas. This cell is excited by a pulsed signal so that a processing can be carried out at different analysis frequencies: at low frequency and at higher frequency. The output signals from the two processing chains are combined in the circuit () so as to provide the levels of concentration of the gas and the concentration of the water vapour. The signals obtained may also be re-combined together with components of the signal Vm of various passbands.

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Wavre, Switzerland

Yves De Coulon