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A family of high-accuracy, solid-state instruments ideally suited for internal combustion engine and vehicular applications has been developed. The core of each instrument is a programmable custom integrated circuit which produces exceptionally precise performance in applications as demanding as off-road equipment. The instruments are compatible with any form of resistive, voltage or current-producing sensor. Instrument outputs include displays in light emitting diode or liquid crystal formats and electronic signals for remote warning or equipment shutdown. Inherently rugged construction permits operation in sustained high-shock and high-vibration environments over wide temperature ranges. Improvements over existing products are delivered at comparable costs.

New techniques, using a special capacitive readout version of the Curtis mercury coulometer, are being used in an ampere-hour meter for rechargeable battery systems. The circuit meets one definition of the “perfect fuel” gage for battery powered vehicles. The unit consists of a small solid-state electronics module driving an indicating meter. It is powered from the battery and will directly and automatically indicate ampere-hours discharged and charged. The unit has an automatic stop when the meter displays “full” or 100% of capacity to permit a safe overcharge situation. Additionally, the unit can provide alarms and detectors for low capacity signals or auxiliary charge control functions. The system is currently under test on a number of battery-powered vehicle programs.