Flow measuring apparatus
Abstract
Abstract A flow measuring apparatus having increased sensitivity is disclosed for measuring the flow of gas, particularly through a confined passage. The flow measuring apparatus comprises a tube having a constant or tapered orifice section followed by an abrupt expansion of the orifice; a total pressure sensing probe is located preferably in the section of the tube with the constant or tapered orifice, the total sensing probe having an opening parallel to the flow of gas and facing upstream; and a static pressure sensing probe is located in the walls of the tube in the expanded orifice section immediately after the abrupt expansion, the static pressure probe having an opening either parallel to the flow of gas and facing downstream or perpendicular to the flow of gas. The sensing probes may be connected to a measuring device that provides a readout of the sensed pressures or pressure differential or to a control unit that is responsive to the sensed pressures or pressure differential.
Inventors
- 👤 Marv L. Dehart
- 👤 M. Leon Kloostra
- 👤 Harold E. Straub
Bibliographic Details
Claims Analysis
Total Claims: 4References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |