Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1987-12-11
1989-08-22
Orsino, Joseph A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
3404503, 340619, 250577, B60Q 900
Patent
active
048599875
ABSTRACT:
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 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. Reliable functioning is had, even at high operating temperatures.
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Aeroquip Product Information and Application News, TIN-2, Summer 1986, "Tedeco Levelmaster Electro-Optic Liquid Level Sensor", 2 pages.
Aeroquip Tedeco Division Bulletin TDB L250, "Tedeco Levelmaster 250 Series", 1987, 2 pages.
Bittman Mitchell D.
Casco Products Corporation
Orsino Joseph A.
Tumm Brian R.
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