초록 ▼

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

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.

대표청구항 ▼

[ We claim:] [1.] Flow measurement apparatus for measuring material flow in a conduit, said apparatus comprising:a flowmeter;a material inlet for diverting some of said material flow in said conduit to said flowmeter, wherein said material inlet is positioned within an interior of said conduit and c

[ We claim:] [1.] Flow measurement apparatus for measuring material flow in a conduit, said apparatus comprising:a flowmeter;a material inlet for diverting some of said material flow in said conduit to said flowmeter, wherein said material inlet is positioned within an interior of said conduit and coupled to said flowmeter;a material outlet for returning material flowing in said flowmeter to said conduit, wherein said material outlet is positioned within said interior of said conduit and coupled to said flowmeter;means for determining the mass flow rate and flow velocity and density of said material flow in said flowmeter;means responsive to said determination of said mass flow rate and said flow velocity and density of said material flow in said flowmeter for determining the flow velocity and mass flow rate of said material in a portion of said conduit between said material inlet and said material outlet; andmeans responsive to said determination of said mass flow rate in said flowmeter and in said conduit portion for determining a total mass flow rate of said material in said conduit.