Actaris S.a.s.

Actans Sas

Itron France

Hervé Dury

Serge Bulteau

Eric Michaud

Frédéric Staub

A device for sensing the rotation of a member rotating about an axis XX' comprises m proximity sensors situated in a plane perpendicular to the axis XX&#x2032; and in m radial directions, m being an integer greater than or equal to 2. A mark fastened to the rotary member and eccentric to the axis XX&#x2032; modifies the amplitude response of the proximity sensors when the rotary member rotates. An excitation circuit excites the proximity sensors, each sensor supplying an excitation response when it is excited. The amplitude of the excitation response of each of the sensors is compared with a comparison threshold value during a time period referred to as an observation window to supply a logic leveloraccording to whether the response amplitude is greater than or less than the comparison threshold value. The movement of the mark past one of the sensors is identified as a function of the value 0 or 1 of said logic level. The comparison threshold value or the observation window characteristic of a sensor L, Lis reset by means of successive iterations using the value 0 or 1 of the logic level when the mark cannot be at the location of the sensor.

Device for sensing a rotary member such as a water meter turbine

A method for detecting malfunctions in a flowmeter includes the measuring of the receive signal V output by a transducer. A characteristic of the receive signal is compared to a predetermined reference characteristic V and the peak voltage V of the receive signal is stored. An alarm signal V is generated when a trigger characteristic V of the receive signal is less than the predetermined reference characteristic. A threshold voltage V is defined, proportional to the peak amplitude V of the receive signal in such a manner that V &equals;K&times;V where K is a factor depending on the transducer. The receive signal is compared with the threshold voltage and a conditioned output signal V is generated in a first state when the receive signal is greater than the threshold voltage, and in a second state when the receive signal is less than the threshold voltage.

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Macon, France

Hervé Dury