Importance

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Abstract

The present invention is an improved method and apparatus for condition sensing and displaying a numeric value associated with the sensed condition wherein the improvement comprises (1) circuitry calibrating the display of the numerical value associated with the sensed condition to a numerical value associated with the sensed condition in a normal ambient environment, while the sensor is within the normal ambient environment; and (2) circuitry for calibrating the display of the numerical value of the sensed condition to a numerical value associated with the sensed condition in a known offset environment which is different than the normal ambient environment, while the sensor is in the known offset environment. The calibration of the display of the numerical value associated with the sensed condition in the normal ambient environment and in the known offset environment aiding in protection from a slope error condition and an offset error condition in the display of the numerical value associated with the sensed condition. The calibration circuitry includes switching elements and a microprocessor. In the exemplary embodiment the sensor is an electrochemical oxygen sensor, the normal ambient environment is open air, which contains 21% oxygen, and the known offset environment is pure oxygen. A system for monitoring battery supply is also included.

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First Claim