Flow meter and method of calibrating same

Details Flow meter and method of calibrating same Flow meter and method of calibrating same

1997-01-08

1998-08-25

Dombroske, George M.

Measuring and testing

Volume or rate of flow

By measuring thrust or drag forces

G01F 130

Patent

active

057984662

ABSTRACT:
By a load detector, a magnitude of a dynamic load, depending on a downward-flow impact of a particulate material flowing through a flow passage, is measured, and also a magnitude of a static load, corresponding to a total amount of the particulate material flown through a predetermined position for a predetermined time period, is measured. A value of a dynamic load-type flow rate of the particulate material, corresponding to a measured value of the dynamic load, is calculated from the measured value of the dynamic load by a first calculation formula, and also a value of an actual flow rate of the particulate material is calculated from a measured value of the static load during the predetermined time period by a second calculation formula. A correction factor for bringing the dynamic load-type flow rate value, depending on the difference of the particulate materials, into agreement with the actual flow rate value is found. The first calculation formula is corrected by the correction factor, and a corrected dynamic load-type flow rate value is calculated from the measured dynamic load value by the use of the corrected first calculation formula. With this construction, there can be obtained a flow meter in which the correction of the flow rate of the flow meter or calibration of the flow meter can be effected easily.

REFERENCES:
patent: 3611803 (1971-10-01), Kajiura et al.
patent: 4440029 (1984-04-01), Tomiyasu et al.
patent: 4768387 (1988-09-01), Kemp et al.
patent: 4926903 (1990-05-01), Kawai
patent: 4931776 (1990-06-01), Klos et al.
patent: 5065632 (1991-11-01), Reuter
patent: 5369603 (1994-11-01), Myers
patent: 5594667 (1997-01-01), Myers

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