Patent
Method and apparatus for fault detection and correction in coriolis effect mass flowmeters
TLDR
In this article, the authors present an approach for detecting and correcting various fault conditions in an operating Coriolis effect mass flowmeter, including the presence of a crack in the flow tubes and stopping the flow of material to prevent release of the material through a cracked flow tubes.Abstract:
Apparatus and methods for detecting and correcting various fault conditions in an operating Coriolis effect mass flowmeter. The apparatus of the present invention receives information from an operating Coriolis mass flowmeter and compares the information to threshold signatures representing various fault conditions. When a fault condition is detected, output signals are applied to inform an operator and to control the mass flow rate through the flowmeter to correct the fault condition. Specifically, the methods of the present invention detect the presence of a crack in the flow tubes and stop the flow of material to prevent release of the material through a cracked flow tubes. Other methods of the present invention detect the void fraction of material flowing through the flow tubes, compute a corrected actual mass flow rate, and control the mass flow rate through the flowmeter to compensate for the effects of the void fraction. Signature information relating to threshold values for measured frequency, drive power, temperature and mass flow of the operating flowmeter as well as the slope and curvature of changes in each measured operating parameter are stored in memory within the fault detection apparatus of the present invention.read more
Citations
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Patent
Correcting for two-phase flow in a digital flowmeter
Manus Henry,M.J. Fuente +1 more
TL;DR: In this article, a flowmeter with a vibratable conduit and a driver connected to the conduit that is operable to impart motion to the flowmeter is disclosed, and a controller is connected to receive the sensor signal.
Patent
Method and apparatus for correcting for performance degrading factors in coriolistype mass flowmeter
Wade M. Mattar,James H. Vignos +1 more
TL;DR: In this article, drivers and sensors in Coriolis-type mass flowmeters are used to monitor and predict flowmeter failure modes due to mechanical deterioration during meter operation, i.e., the relative values of two different signals, e.g., resonant frequencies, associated with Coriola flow conduit motion are monitored as an indicator of excessive mechanical deterioration and also used to compensate for shifts in meter factor.
Patent
Correction of coriolis flowmeter measurements due to multiphase flows
TL;DR: A Coriolis flowmeter is operable as a vibrating tube densitometer where a flowtube is driven to vibrate at a fundamental frequency from which density of the material flowing through the flowtube may be calculated as mentioned in this paper.
Patent
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Patent
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References
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TL;DR: In this paper, a flow rate measurement system and method suitable for monitoring filtrate flow in a hemodialysis apparatus, provides a pair of flow meters in series at the input of a dialyzer for producing electrical signals indicative of dialysate flow rate.
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Patent
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Patent
Stationary coils for a coriolis effect mass flowmeter
TL;DR: A Coriolis flowmeter has a pair of parallel vibrating flow tubes equipped with a driver and sensors, each comprising a fixed non-movable coil and magnetically cooperated with a unique pair of magnets.