Abstract: 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 (1) includes an insulating substrate (2), a set of electrodes consisting of a working electrode (3), an auxiliary electrode (4) and a reference electrode, at least one of the working electrode (3) and auxiliary electrode (4) being configured on the insulating substrate (2). At least one of the working electrode (3) and auxiliary electrode (4) is covered with an insulating layer (8), the insulating layer (8) including at least one opening exposing at least one of the working electrode (3) and auxiliary electrode (4).

Abstract: A sensing probe intended to measure the content of an oxygen reducible substance in a fluid, includes: a probe body containing an interface and processing circuit, a dry sensing head including an amperometric sensor intended to measure the content of the oxygen reducible substance. The sensing head is removable. The sensing head and the probe body include respectively coupling elements cooperating with each other and able to be separated, and the sensing probe furthermore includes connecting elements designed to connect the removable sensing head to the interface and processing circuit of the probe body.

Abstract: 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 (60) 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.

Abstract: 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 (1) includes an insulating substrate (2), a set of electrodes consisting of a working electrode (3), an auxiliary electrode (4) and a reference electrode, at least one of the working electrode (3) and auxiliary electrode (4) being configured on the insulating substrate (2). At least one of the working electrode (3) and auxiliary electrode (4) is covered with an insulating layer (8), the insulating layer (8) including at least one opening exposing at least one of the working electrode (3) and auxiliary electrode (4).

Abstract: 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 (60) 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.