Method and sensor for measuring a mass flow

G - Physics – 01 – F

Patent

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Details

G01F 1/698 (2006.01)

Patent

CA 2356279

A heating element (4) is arranged between two temperature sensors (5, 6) in order to measure the mass flow of a liquid or a gas. The mass flow is determined from the temperature difference of the temperature sensors (5, 6). The heating element (4) is operated by pulses in order to reduce power consumption of the device. A further reduction of the power consumption is reached by means of a monitoring circuit (12), which switches the actual measuring section (11) on only if the signals from the temperature sensors (5, 6) ful-fil a threshold condition.

Selon l'invention, pour la mesure du flux massique d'un liquide ou d'un gaz, un élément chauffant (4) est disposé entre deux capteurs de température (5, 6). Le flux massique est déterminé à partir de la différence de température des capteurs de température (5, 6). Pour que la consommation en courant de l'appareil soit réduite, l'élément chauffant (4) est activé de façon impulsionnelle. On obtient une autre réduction de la consommation de courant grâce à un circuit de surveillance (12) qui ne met en circuit la partie de mesure (11) proprement dite que lorsque les signaux des capteurs de température (5, 6) remplissent une condition de seuil.

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