Abstract: An injection moldable composite comprising an admixture of a polyetherketone such as polyetheretherketone (PEEK) matrix resin, a metal filler such as stainless steel fiber coated with a resin sizing soluble in the matrix resin, and glass fiber. The resulting molded form of the composite being electrically conductive and aluminum galvanic compatible.

Abstract: A monitoring circuit for monitoring a plurality of signals developed by remote sensors which preferably are capacitance probe sensors. The circuit is intended for use with a motor vehicle maintenance system employing capacitance probes to detect low and safe levels of oils and coolants in a vehicle engine. The monitoring circuit includes a constant voltage source with a voltage divider in circuit therewith to develop a plurality of reference voltage signals of predetermined values which are applied to respective inputs of a plurality of voltage comparators that receive, at their other terminals, condition-responsive voltage signals generated by a condition sensing circuit. The condition sensing circuit comprises a liquid level capacitance probe which generates intermediate, high and low voltage signals indicative of safe and low, respectively, levels of sense liquid.