Fluid flow measuring apparatus
Abstract
Abstract APPARATUS FOR MEASURING THE FLOW OF FLUID THROUGH A MAIN SUPPLY LINE WHICH HAS A HEAD ELEMENT THEREIN TO DEVELOP A PRESSURE DROP. A SHUNT PATH HAVING A RESTRICTIVE ELEMENT IS PROVIDED TO BRIDGE THE HEAD ELEMENT. THE SHUNT PATH INCLUDES A THERMAL FLOWMETER COMPRISING A CONDUIT AT LEAST A PORTION OF WHICH IS ELECTRICALLY AND THERMALLY CONDUCTIVE, THE CONDUCTIVE PORTION HAVING ONE OR MORE THERMOELECTRIC DEVICES POSITIONED THEREALONG. HEATING CURRENT IS PASSED THROUGH THE CONDUCTIVE CONDUIT PORTION, AND THE TEMPERATURE GRADIENT CAUSED BY FLUID FLOW THROUGH THE HEATED CONDUIT IS SENSED BY THE THERMOELECTRIC DEVICES TO PROVIDE AN INDICATION OF MASS FLOW SUBSTANTIALLY INDEPENDENT OF PRESSURE AND TEMPERATURE. A SOURCE OF PURGING FLUID AT HIGH PRESSURE IS CONNECTED THROUGH BLEED VALVES TO THE SHUNT PATH ON OPPOSITE SIDES OF THE THERMAL FLOWMETER.
Inventors
- 👤 James M Benson
- 👤 Edmond Easter
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |