Patent ID: 7194363
Filing Date: 2007-03-20
Classification: G01F

Abstract:
1. A low power ultrasonic flowmeter to be powered by a two wire power supply loop comprising: an ultrasonic flow sensor; a signal processing unit for determining a measurement result based on measurements performed by the ultrasonic flow sensor; an input/output unit to be connected to the two wire loop, for controlling a current of the power supplied to represent the measurement result, and for receiving power from the power supply loop; and a power management system, for an energy efficient distribution of the power supplied to the flowmeter via the input/output unit, said power management system comprising storage means for storing energy during times of low power consumption and resupplying the stored energy during times of high power consumption, wherein: said storage means comprise storage means for storing incoming energy received via said input/output unit, and further storage means for storing energy feedback from said ultrasonic flow sensor.