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Gas detection and alarm system for monitoring gas such as carbon monoxide

  • US 5,694,118 A
  • Filed: 12/28/1994
  • Issued: 12/02/1997
  • Est. Priority Date: 12/28/1994
  • Status: Expired due to Fees
First Claim
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1. A gas detection and alarm system for monitoring carbon monoxide, comprising:

  • detection means for detecting a predetermined dose of carbon monoxide, the detection means including a semiconductor-type carbon monoxide sensor having a plurality of connections connected to at least three terminals of a microprocessor through a plurality of transistors;

    indication means for indicating the dose detected by the detection means to the user, said indication means including a temperature compensating circuit for maintaining a constant temperature thereof;

    microprocessor means including the microprocessor for digitally controlling said indication and detection means;

    power conversion means for supplying constant power to said detection and indication means;

    housing means for housing said detection, indication, microprocessor and power conversion means,wherein said housing means has a circular configuration and includes an electric plug disposed on a bottom surface of said housing means, and said indication means includes a buzzer for generating an audio sound and a first transistor directly connected to said buzzer;

    wherein said housing means further includes;

    a top cover having a light emitting portion, anda bottom plate having said electric plug and a surface for mounting thereon said indication, power conversion, microprocessor, and detection means in a substantially coplanar manner, said top cover and bottom plate engaging each other to form a housing unit;

    wherein said light emitting portion includes a movable switch for resetting the system after activation of said indication means to indicate said dose detection; and

    wherein said power conversion means includes a power conversion circuit having no transformers, said conversion circuit receiving AC power and generating constant DC power from said AC power.

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