Portable liquid level maintenance monitor system for vehicles

摘要: A monitoring circuit for a plurality of signals developed by remote sensors which preferably are capacitance probe sensors. The is intended use with motor vehicle maintenance system employing probes to detect low and safe levels oils coolants in engine. includes constant voltage source divider therewith develop reference predetermined values applied respective inputs comparators that receive, at their other terminals, condition-responsive generated condition sensing circuit. comprises liquid level generates intermediate, high indicative low, respectively, sense liquid. Open or shorted leads the generate zero maximum voltages, also comparator circuits, whose outputs activate visible indicators register unsafe level, open circuits.