Individual smoke detector with sensitivity calibration and monit

Details Individual smoke detector with sensitivity calibration and monit Individual smoke detector with sensitivity calibration and monit

1996-08-01

1997-12-16

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

With particular system function

340630, G08B 2900

Patent

active

056990430

ABSTRACT:
A process and apparatus are provided for calibrating an individual smoke detector prior to installation so its sensitivity can be determined easily throughout its useful life. Representations of detector output signals are stored in the detector prior to installation, preferably at the time of manufacture, and used later for determining the sensitivity of the detector. The signals may represent alarm and clean-ambient conditions, or one of such conditions and the difference between them. During monitoring of the detector, after its installation, a new reading of a corresponding signal under clean-ambient conditions is sampled and the differences before and after installation are compared to determine the sensitivity of the detector when it is monitored. The detector includes electrical contacts from which a representation of detector sensitivity is available for monitoring with an external electrical probe, such as a common voltmeter.

REFERENCES:
patent: 4302753 (1981-11-01), Conforti
patent: 4317113 (1982-02-01), Honma
patent: 4559453 (1985-12-01), Muggli et al.
patent: 4595914 (1986-06-01), Siegel
patent: 4977527 (1990-12-01), Shaw et al.
patent: 5212470 (1993-05-01), Thuillard et al.
patent: 5243330 (1993-09-01), Thuillard
patent: 5281810 (1994-01-01), Fooks et al.
patent: 5543777 (1996-08-01), Vane et al.
patent: 5546074 (1996-08-01), Bernal et al.

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