Analog flow meter instrument
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United States of America Patent
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-
Sep 12, 1989
Grant Date -
N/A
app pub date -
Jul 20, 1988
filing date -
Jul 20, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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