Patent ID: 7302356
Filing Date: 2007-11-27
Classification: G01F

Abstract:
1. A Coriolis flowmeter for measuring flow in applications where consecutive batches of product are sent through a flowmeter and at the beginning and at the end of each individual batch of the consecutive batches of product, a transition time interval occurs, during which the flowmeter measurement performed by the flowmeter does not produce accurate results, the improvement comprising: a measurement tube; a driver for imparting a force proportional to an applied excitation signal to said measurement tube for setting said measurement tube into an oscillatory motion; motion sensors for measuring the motion of said measurement tube; an excitation signal generator, for generating the excitation signal to be supplied to said driver based on the measurement signals derived by said motion sensors, means for determining transition time intervals during which a sudden transition from a full condition of said measuring tube to an empty condition of said measuring tube, or vice versa, occur by monitoring the excitation signal and by determining whether an amplitude of the excitation signal exceeds an application-specific range; and means for determining a corrected flow of a fluid through said measurement tube, wherein: each transition time interval takes place either before an interval during which a batch of product flows through said measuring tube and during which the excitation signal does not exceed the application specific range and after an interval during which no flow occurs and the excitation signal does not exceed the application specific range, or before an interval during which no flow occurs and the excitation signal does not exceed the application specific range and after an interval during which a batch of product flows through said measurement tube and during which the excitation signal does not exceed the application specific range; the corrected flow is determined based on measurement signals derived by said motion sensors, when the excitation signal has an amplitude that lies within the application-specific range; and the corrected flow is set to an application-specific flow, during time intervals where sudden transitions occur.