Liquid metering

G - Physics – 01 – F

Patent

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Details

G01F 1/68 (2006.01) G01F 1/684 (2006.01)

Patent

CA 2250816

A meter (2) to measure the volumetric flow rate of a liquid, for example water, is formed with a pipe (4) forming a liquid flow path containing a low power electrical heater (12). A temperature sensor (19) measures the temperature T1 of the liquid adjacent to an upstream end of the heater and a temperature sensor (20) measures the temperature T2 of the liquid adjacent to a downstream end of the heater. The heater (12) adds heat power of a value P to the liquid. A control arrangement (18) comprising computer means calculates the flow rate Q using the expression (a) where ST1 and DT1 are respectively the specific heat capacity of the liquid and the density of the liquid at the temperature T1 measured by the sensor (19).

L'invention concerne un compteur (2) servant à mesurer le débit volumétrique d'un liquide, par exemple de l'eau. Ledit compteur comprend un tuyau (4) qui forme un circuit d'écoulement de liquide, ledit circuit contenant un chauffe-eau électrique (12) à faible énergie. Un capteur thermique (19) mesure la température T1 du liquide contigu à une extrémité amont du chauffe-eau, et un capteur thermique (20) mesure la température T2 du liquide contigu à une extrémité aval du chauffe-eau. Ledit chauffe-eau (12) ajoute une puissance thermique d'une valeur P au liquide. Un ensemble commande (18), qui comprend une unité de calcul, calcule le débit Q au moyen de l'équation (a), dans laquelle ST1 et DT1 représentent, respectivement, la capacité calorifique spécifique du liquide et la densité du liquide à la température T1 mesurée par le capteur (19).

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