Patent ID: 7650800

Claim:
Flow rate sensor including a measuring chamber, into which a medium, the volume and/or flow rate of which is to be measured, can be fed, said flow rate sensor comprising: measuring mechanism elements disposed in the measuring chamber and mounted in a freely rotatable manner, said measuring mechanism elements comprising a first measuring mechanism element that includes a first gear wheel with teeth that meshes with a second measuring mechanism element that includes a second gear wheel with teeth, a pair of sensors for measuring magnetic fields and/or variations of magnetic fields, said pair of sensors constructed and arranged for mounting in adjacent spaced relationship to only one of said first and second measuring mechanism elements; said pair of sensors generating respective separate sinusoidal output signals having predetermined phase therebetween; a circuit device, to which the respective output signals of the sensors are supplied, wherein the sensors produce and supply to the circuit device respective output sinusoidal signals, and wherein the circuit device is constructed and arranged to form, from the output signals of the sensors, countable output values.