Measuring and testing – Volume or rate of flow – Using rotating member with particular electrical output or...
Patent
1990-10-18
1993-02-09
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Using rotating member with particular electrical output or...
73261, G01F 310
Patent
active
051845199
ABSTRACT:
An improved resolution positive displacement flow meter of the type having a pair of meshed gears. A plurality of sensors are spaced to detect movement of the gear teeth as liquid flows through the flow meter. Where the gears each have n teeth and s sensors are used, the possible locations around the gear for each sensor relative to a reference point are determined by the formula ##EQU1## where K=0,1,2, . . . ,(s-1) and L=0,1,2, . . . ,(n-1). The outputs from the sensors are logically combined, for example, by an exclusive OR circuit or by an OR circuit, to produce s pulses each time the gear rotates through the angle between two adjacent gear teeth.
REFERENCES:
patent: 4399709 (1983-08-01), Diepold-Scharnitzky
patent: 4641522 (1987-02-01), Lopresti
patent: 4878454 (1989-11-01), Cann
Ciarelli Gary J.
Lunk J. Allan
Goldstein Herbert
Illinois Tool Works Inc.
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