Patent US3785204A successfully refreshed from Google Patents.
US3785204A
Expired / Lapsed
US
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Mass flow meter
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1972-04-06
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Granted: 1974-01-15
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Expires: 1992-04-06
Abstract
Abstract A mass flow meter determines the weight flow of a fluid stream by combining in series a density-sensitive flow measuring device and a density-insensitive flow measuring device. The densityinsensitive flow measuring device is a vortex-shedding meter which requires no moving parts to determine volumetric or velocity flow. In combination with the vortex-shedding meter, the density-sensitive flow measuring device may be an orifice meter or preferably a pressure differential instrument connected across the vortex shedding meter itself. Information obtained from the density-sensitive flow measuring device and the densityinsensitive flow measuring device may be combined to obtain mass flow rate.
Inventors
- 👤 E Lisi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:24
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/76; G01F1/86
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A meter for measuring the mass flow rate of a fluid passing through a conduit independently of said fluid''s physical properties comprising: a. a section of said conduit having the same cross-sectional area as the said conduit adjacent the ends thereof thereby introducing no additional pressure drop; b. a single non-movable element disposed inside said section so as to interfere with the flow of fluid, thereby causing vortices to be shed from said element and a pressure drop to be established by and across said element; c. frequency detecting means for measuring the frequency of vortex-shedding from said element; d. differential pressure detecting means operably disposed within said section for measuring pressure drop across said element; e. a mass flow computer connected to the frequency detecting means of (c) and the differential pressure detecting means of (d) for receiving the output of said detecting means and computing mass flow as directly proportional to differential pressure and inversely proportional to frequency.
Claim 2
Dependent Claim
160 words
A meter for measuring the mass flow rate of a fluid passing through a conduit independently of said fluid''s physical properties comprising: a. a section of said conduit having the same cross-sectional area as the said conduit adjacent the ends thereof thereby introducing no additional pressure drop; b. a single non-movable element disposed inside said section so as to interfere with the flow of fluid, thereby causing vortices to be shed from said element and a pressure drop to be established by and across said element; c. frequency detecting means for measuring the frequency of vortex-shedding from said element; d. differential pressure detecting means operably disposed within said section for measuring pressure drop across said element; e. a mass flow computer connected to the frequency detecting means of (c) and the differential pressure detecting means of (d) for receiving the output of said detecting means and computing mass flow as directly proportional to differential pressure and inversely proportional to frequency.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |