Apparatus and method for monitoring liquid levels

• Main Author: MARKUS; JAMES A
• Format: Patent
• Language: English
• Published: 22.08.1989
• Subjects: BLASTING; CRANKCASE VENTILATING; ENGINE PLANTS IN GENERAL; HEATING; LIGHTING; LUBRICATING INTERNAL COMBUSTION ENGINES; LUBRICATING OF MACHINES OR ENGINES IN GENERAL; MACHINES OR ENGINES IN GENERAL; MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; MECHANICAL ENGINEERING; METERING BY VOLUME; PHYSICS; STEAM ENGINES; TESTING; WEAPONS

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 rat...