Battery powered condition sensing and display apparatus with low

Details Battery powered condition sensing and display apparatus with low Battery powered condition sensing and display apparatus with low

1977-05-10

1980-02-19

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

73 23, 340632, G08B 2100, G08B 1710

Patent

active

041897250

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.

REFERENCES:
patent: 3802182 (1974-04-01), Fujita
patent: 4010456 (1977-03-01), Erni
patent: 4024415 (1977-05-01), Matsuura
patent: 4041691 (1977-08-01), Chihara et al.
patent: 4074515 (1978-02-01), Asano

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