Bypass type coriolis effect flowmeter

Details Bypass type coriolis effect flowmeter Bypass type coriolis effect flowmeter

1997-02-25

1999-01-19

Chilcot, Richard

Measuring and testing

Volume or rate of flow

Using differential pressure

73202, 73861356, G01F 184, G01F 500

Patent

active

058615610

ABSTRACT:
A bypass flowmeter for measuring the material flow in a conduit. An optimum pressure drop is developed across the flowmeter by coupling the material outlet of the flowmeter to the throat of a venturi positioned within the conduit. This increased pressure drop improves the material flow rate through the flowmeter. This enhances flowmeter accuracy and sensitivity and the flowmeter's ability to measure mass flow rates for low density materials such as gas. The ratio of the material flow within the flowmeter to that of the conduit is derived with improved precision over prior arrangements which assume a constant ratio of material flow between the flowmeter and the conduit. The material flow information for the conduit is obtained for materials having a varying viscosity by the use of a differential pressure sensor which measures the pressure drop across the flowmeter and transmits this information to instrumentation which uses it to derive material flow information for the conduit with improved precision. An alternative embodiment not having a venturi operates in the same manner to derive the material flow ratio between the flowmeter and the conduit and, in turn, the total material flow in the conduit.

REFERENCES:
patent: 3314290 (1967-04-01), Peranio
patent: 4381668 (1983-05-01), Sato et al.
patent: 5297426 (1994-03-01), Kane et al.
patent: 5333496 (1994-08-01), Fenelon
patent: 5347874 (1994-09-01), Kalotay et al.
patent: 5359881 (1994-11-01), Kalotay et al.
Insertion vs. In-Line Flowmeters; Balancing Accuracy Against Cost; Keith Larson; Control Jul. 1994.
Bypass Flowmeters; Process Measurement & Analysis, 3rd Edition, Bela G. Liptak; Chilton Book Co., pp. 367-371.

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