Measuring and testing – Volume or rate of flow – Using differential pressure
Patent
1988-07-20
1989-09-12
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Using differential pressure
73DIG11, 250209, G01F 122
Patent
active
048648701
ABSTRACT:
An analog flow meter instrument includes a flow meter monitoring the flow of fluid. A sensor unit is secured to the flow meter and include an indicator rod in an oil filled tube. The rod extends into the flow meter and is positioned in accordance with the flow. The sensor includes a housing having a slot to visually read the location of the rod. A light beam unit is mounted to one side of the tube and a plurality of phototransistors in a linear array are mounted to the opposite side of the tube. The phototransistors are connected in a current summing network to generate an analog current signal, the amplitude of which is linearly related to the fluid flow. The output signal is amplified and connected to output devices. The analog signal can be reliably transmitted over relatively long distances within the factory environment using conventional low voltage wiring. A "dirty" oil monitor is connected to the zero flow phototransistor and includes an LED which is energized at zero flow and with flow if the dirty oil blocks proper light transmission.
REFERENCES:
patent: 3582662 (1971-06-01), Soina
patent: 4566337 (1986-01-01), Smart
patent: 4630485 (1986-12-01), Wastl, Sr.
Lebeck Norman G.
Payne Kenneth R.
Goldstein Herbert
Waukee Engineering Company
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