A device for measuring gas flow-rate, particularly for burners

Details A device for measuring gas flow-rate, particularly for burners A device for measuring gas flow-rate, particularly for burners

G - Physics

01

F

G01F 1/696 (2006.01)

Patent

CA 2437912

A device 2) for measuring the flow-rate of gas in a duct (3), particularly for burners, is described and comprises a gas flow-rate sensor (S1) which can generate a first output signal (Vs1 proportional to the flow-rate detected, a temperature-compensation circuit (24) to which the first output signal is applied and which can generate a second output signal (Vc) proportional to the gas flow-rate detected by the sensor (S1) and independent of the temperature of the gas and/or the temperature of the flow-rate sensor, the compensation circuit comprising a temperature sensor (S2). The measuring device (1) also comprises a calibration circuit (22) to which the second output signal (Vc) of the temperature-compensation circuit (24) is applied. The calibration circuit (22) can generate a third output signal (Vout) proportional to the gas flow- rate detected and independent of structural parameters of the flow-rate sensor (S1) and/or of the temperature sensor (S2) so that the third output signal is correlated with the flow-rate detected and independent of the temperature of the gas and/or the temperature of the flow-rate sensor (S1), as well as of the structural parameters of the flow-rate sensor (S1).

L'invention concerne un dispositif (2) destiné à mesurer le débit gazeux dans un conduit (3), notamment pour des brûleurs. Ce dispositif comprend un capteur (S1) de débit gazeux pouvant générer un premier signal de sortie (V¿s1?) proportionnel au débit détecté, un circuit de compensation de température (24) auquel le premier signal de sortie est appliqué et pouvant générer un deuxième signal de sortie (Vc) proportionnel au débit gazeux détecté par le capteur (S1) et indépendant de la température du gaz et/ou la température du capteur de débit, le circuit de compensation comprenant un capteur température (S2). Le dispositif de mesure (1) comprend aussi un circuit d'étalonnage (22) auquel le deuxième signal de sortie (Vc) du circuit de compensation de température (24) est appliqué. Le circuit d'étalonnage (22) peut générer un troisième signal de sortie (Vout) proportionnel au débit gazeux détecté et indépendant des paramètres structurels du capteur de débit (S1) et/ou du capteur de température (S2) de manière que le troisième signal de sortie soit mis en corrélation avec le débit détecté et indépendant de la température du gaz et/ou de la température du capteur de débit (S1), ainsi que des paramètres structurels du capteur de débit (S1).

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