Alarm with CO and smoke sensors
First Claim
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1. A life safety device comprising:
- a smoke sensor for producing a smoke sensor signal;
a carbon monoxide (CO) sensor for producing a CO sensor signal; and
a controller for controlling generation of a smoke alarm based upon the smoke sensor signal and the CO sensor signal, the controller increasing sensitivity to the smoke sensor signal if the CO sensor signal reaches a CO/smoke threshold before the smoke sensor signal reaches an initial smoke threshold, and wherein the controller causes a smoke alarm to be generated if, after sensitivity to the smoke sensor signal is increased, the smoke sensor signal reaches an increased sensitivity threshold.
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Abstract
A life safety device includes a smoke sensor and a carbon monoxide (CO) sensor. Smoke sensitivity of the device is adaptively adjusted based upon the smoke sensor signal and the CO sensor signal.
93 Citations
20 Claims
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1. A life safety device comprising:
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a smoke sensor for producing a smoke sensor signal; a carbon monoxide (CO) sensor for producing a CO sensor signal; and a controller for controlling generation of a smoke alarm based upon the smoke sensor signal and the CO sensor signal, the controller increasing sensitivity to the smoke sensor signal if the CO sensor signal reaches a CO/smoke threshold before the smoke sensor signal reaches an initial smoke threshold, and wherein the controller causes a smoke alarm to be generated if, after sensitivity to the smoke sensor signal is increased, the smoke sensor signal reaches an increased sensitivity threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of detecting fires, the method comprising:
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comparing a smoke sensor signal to a smoke alarm threshold; comparing a carbon monoxide (CO) sensor signal to a CO/smoke threshold; adjusting the smoke alarm threshold based upon the smoke sensor signal and the CO sensor signal, comprising increasing sensitivity to smoke if the CO sensor signal reaches the CO/smoke threshold; and generating a smoke alarm based upon the smoke sensor signal and the adjusted smoke alarm threshold. - View Dependent Claims (8, 9, 10)
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11. A device comprising:
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a first hazardous condition sensor for producing a first sensor signal; a second hazardous condition sensor for producing a second sensor signal; and a controller producing a first alarm when the first sensor signal meets a first threshold and a second alarm when the second sensor signal meets a second threshold, and for adjusting the first threshold to change sensitivity of the controller to the first sensor signal as a function of the first sensor signal and the second sensor signal, wherein the controller increases sensitivity to the first sensor signal if the second sensor signal reaches a third threshold before the first sensor signal reaches an initial first threshold. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A detector comprising:
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a smoke sensor for producing a smoke sensor signal; a carbon monoxide (CO) sensor for producing a CO sensor signal; and a controller for generating a smoke sensitive state, smart hush state ,and alarm state, wherein the smoke sensitive state is generated as a function of CO sensed before smoke has been sensed, the smart hush state is generated as a function of smoke sensed before CO has been sensed, and the alarm state is generated if the smoke sensor signal reaches a first smoke threshold in the smoke sensitive state or a second smoke threshold in the smart hush state. - View Dependent Claims (18, 19, 20)
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Specification