Battery powered condition sensing and display apparatus with low battery indication
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United States of America Patent
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-
Feb 19, 1980
Grant Date -
N/A
app pub date -
May 10, 1977
filing date -
May 10, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A condition monitoring system such as a hospital oxygen monitoring and analyzing device which is battery powered and of such low current drain circuitry that the monitor may be maintained ON continuously. The circuitry senses battery condition when the end of battery life is approaching as indicated by terminal voltage drop. The circuitry continues to provide an accurate display but also indicates a part of the display and additional symbol. The circuitry provides a separate indication under calibration conditions, and the improved voltage regulator includes a transistor back biased to breakdown as the regulation device. A remote sensor is used and engaging the sensor with the unit, automatically powers all circuitry.
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