Patent ID: 6820480
Filing Date: 2004-11-23
Classification: G01F

Abstract:
A device for measuring the flow-rate of a gas-flow in a duct, comprising:a gas flow-rate sensor detecting the flow-rate and generating a first output signal proportional to the flow-rate detected; a temperature-compensation circuit receiving the first output signal and generating a second output signal proportional to the flow-rate of gas detected by the flow-rate sensor and independent of at least one of the temperature of the gas and the temperature of the flow-rate sensor, the compensation circuit including a temperature sensor; and a calibration circuit receiving the second output signal of the temperature-compensation circuit, the behaviour of said second output signal being represented, for a fixed flow-rate, by a family of curves of known equation depending on the parameters of the flow-rate sensor, the calibration circuit having a first and a second resistive network of variable overall resistance by which each curve of the family representing the second output signal is made to pass through a first and a second predetermined fixed point, so that the calibration circuit generates a third output signal proportional to the gas flow-rate detected and independent of at least one of the structural parameters of the flow-rate sensor and the temperature sensor so that the third output signal is correlated with the flow-rate detected and independent of at least one of the temperature of the gas, the temperature of the flow-rate sensor, and the structural parameters of the flow-rate sensor.