Measuring and testing – Volume or rate of flow – System
Patent
1974-04-24
1976-04-06
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
System
324 78J, 340186, 340210, G01F 132, G01R 2306, G08C 1902
Patent
active
039480984
ABSTRACT:
Flow-metering apparatus of the vortex-shedding type wherein an obstruction in a flowing fluid develops a series of vortices which are sensed by a pressure-responsive piezo-electric element to produce an alternating voltage having a frequency corresponding to the fluid flow rate. The piezo-electric voltage signal is processed by electronic circuitry to provide for precise detection of the zero-crossings of the voltage alternations. The resulting frequency signal controls the charge/discharge characteristics of a set of capacitors, with the average charging current corresponding in magnitude to the frequency of vortex shedding. This average current controls an output amplifier in a feedback arrangement to produce a relatively high-powered d-c flow signal over a two-wire transmission line leading to a remote station. In another arrangement, a high-powered pulsating flow signal is developed for transmission over a three-wire transmission line leading to a remote station.
REFERENCES:
patent: 3209253 (1965-09-01), Gray
patent: 3218852 (1965-11-01), Scarpa et al.
patent: 3575611 (1971-04-01), Reed
patent: 3600612 (1971-08-01), Beeken
patent: 3601707 (1971-08-01), Bauer
patent: 3603876 (1971-09-01), Grondy
patent: 3609395 (1971-09-01), Jania
patent: 3706035 (1972-12-01), Hoehn
patent: 3758858 (1973-09-01), McCue
Richardson David A.
Robinson Robert J.
Goldstein Herbert
The Foxboro Company
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