Composite detector
First Claim
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1. A composite detector system, comprising:
- a plurality of sensor means for detecting physical phenomena defined by at least one of the parameters heat, smoke, and gas according to different principles of detection, and for outputting analog detection signals;
a plurality of normally closed analog switches connected to outputs of said plurality of sensor means;
selector means for opening one or more of the analog switches and operated with a control signal from a monitor circuit means for determining a system situation for which the selector means is to be operated; and
operation circuit means for deriving a composite output based upon a combination of all of said analog detection signals fed through said plurality of normally closed analog switches.
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Abstract
A composite detector includes a plurality of sensors of the same or different types, a plurality of analog switches connected to outputs of the plurality of sensors, and an operation circuit, such as an operational amplifier. The sensors detect physical phenomena such as heat, smoke and gas according to different principles of detection, and output analog detection signals. The analog switches are controlled by a selector operated with a control signal from a central monitor or magnitudes of outputs from the plurality of sensors. The operation circuit calculates outputs from the plurality of analog switches.
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Citations
10 Claims
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1. A composite detector system, comprising:
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a plurality of sensor means for detecting physical phenomena defined by at least one of the parameters heat, smoke, and gas according to different principles of detection, and for outputting analog detection signals; a plurality of normally closed analog switches connected to outputs of said plurality of sensor means; selector means for opening one or more of the analog switches and operated with a control signal from a monitor circuit means for determining a system situation for which the selector means is to be operated; and operation circuit means for deriving a composite output based upon a combination of all of said analog detection signals fed through said plurality of normally closed analog switches. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A composite detector system, comprising:
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at least wo sensor means each for detecting a different environmental parameter and for outputting respective analog detection signals; a plurality of normally closed analog switches each of which is connected to receive one of said analog detection signals from a respective one of the sensor means; selector means having outputs connected to respective ones of the analog switches for selectively opening the same and inputs connected to respective ones of said sensor means; output circuit means for combining outputs from all of the plurality of analog switches so as to provide a composite output signal; and monitor circuit means connected to control the selector means and for determining a system situation for which the selector means is to be operated so as to selectively open at least one of said analog switches. - View Dependent Claims (8, 9, 10)
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Specification