A DEVICE FOR MEASURING THE FLOW RATE OF A FLUID, IN PARTICULAR A LIQUID

摘要

The device (1) for measuring the flow rate of a fluid in a conduit (2; 2A, 2B) comprises a bladed impeller (3; 3 A, 3B) mounted in the conduit (2; 2A, 2B) so as to be driven in rotation by the flow of the fluid, and to which at least one magnet (4; 4A, 4B) is fixed, and at least one magnetic field sensor (5; 5 A, 5B) arranged in a fixed position near the conduit (2; 2A, 2B) and capable of causing the generation of a signal (pulse) each time the magnet (4; 4A, 4B) of the impeller (3; 3 A, 3B), passes thereby. The arrangement is such that the number of signals (pulses) generated by the sensor (5; 5 A, 5B) in a period of time is representative, according to a predetermined relationship, of the flow rate (Q) of the fluid in the associated conduit (2; 2A, 2B). At least one magnetic field sensor (5; 5 A, 5B) is coupled to a processing and a control circuit (PCU) including a microprocessor (6) and associated memory means (7), predisposed for processing in predetermined manners the signals issued by said at least one sensor (5; 5 A, 5B) and providing a digital output signal having at least one feature which varies in a predetermined manner as a function of the flow rate (Q) of the fluid in the associated conduit (2; 2A, 2B).