In-flow coriolis effect mass flowmeter
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United States of America Patent
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Sep 20, 1994
Grant Date -
N/A
app pub date -
Jan 25, 1993
filing date -
Jan 25, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
A mass flowmeter has a flow tube inserted within the confines of a conduit containing a material flow. Mass flow information is derived for the material flow within the conduit by generating mass flow information for the material flowing within the smaller flow tube positioned within the conduit and then by adjusting the calculations for the flow tube to represent mass flow information for the conduit. In accordance with a first embodiment of the invention, a pressurized cover is positioned around the flow tube to isolate the exterior surface of the flow tube from the material in the conduit. The space between the exterior of the flow tube and the cover is pressurized to a pressure equal to that of the material in the conduit. Both sides of the flow tube walls are at the same pressure so that a flow tube comprised of thinner and more flexible material may be used. In accordance with a second embodiment of the invention, the cover is not used and the flow tube is inserted directly into the conduit and the exterior walls of the flow tube are in contact with the material within the conduit. This embodiment is advantageous in applications in which the conduit material is of low viscosity. The embodiment with the pressurized cover is ideally suited for use in applications with heavy viscosity material.
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