Smoke detector calibration
4 Assignments
0 Petitions
Accused Products
Abstract
A method for calibrating a smoke detector includes adjusting the sensitivity of the smoke detector to get a consistent predetermined response over the expected operating range. The sensitivity is generally consistent for all detectors and an independent offset value is determined for each detector. This offset value basically corresponds to the signal from the detector in a clean atmosphere. The sensitivity of the smoke detector is determined by measuring the response at different levels of obscuration and then appropriately adjusting the output of the light source of the detector. This process is repeated until the desired sensitivity is achieved. Thereafter, the offset value is measured or calibrated and stored in the smoke detector for use in setting alarm values.
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Citations
15 Claims
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1-8. -8. (canceled)
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9. A smoke detecting system comprising a control panel in two way communication with a series of smoke detectors wherein each smoke detector has a variable output LED light source, a smoke evaluation chamber, a light receiver and a circuit for measuring the output of the light receiver, a stored offset value for determining alarm values and a predetermined sensitivity;
- and wherein said predetermined sensitivity is approximately equal for all smoke detectors and said stored offset value is dependent on the individual characteristics of the respective smoke detector, and each alarm value for a respective detector is calculated by adding a fixed value to said stored offset value.
- View Dependent Claims (10, 11, 12, 13, 14, 15)
Specification