G - Physics – 01 – F
Patent
G - Physics
01
F
73/59
G01F 23/28 (2006.01) F01M 11/12 (2006.01) G01F 23/00 (2006.01) G01F 23/292 (2006.01)
Patent
CA 1319532
APPARATUS AND METHOD FOR MONITORING LIQUID LEVELS Abstract of the Disclosure An apparatus to indicate a low level of liquid in a vessel, such as an automobile crankcase. A light-emitting diode and a phototransistor are coupled at the crankcase so that the light received by the phototransistor varies with rising or falling oil levels. The diode has a given maximum current rating. A unique pulse generating circuit applies a short duration, high-current pulse to the light- emitting diode to produce a correspondingly short but intense burst of radiant energy that is received by the phototransistor. The advantage of the present arrangement is that the sensitivity of response is superior to that of a phototransistor employed with a light-emitting diode driven by low-level voltages giving rise to currents equal to or less than its steady-state rating. False readings are eliminated when the vehicle is on an incline, or when the ignition switch is improperly operated. Reli- able functioning is had, even at high operating tempera- tures.
585289
Casco Products Corporation
Smart & Biggar
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