Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-06-01
1991-09-17
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
Specific condition
73 2331, G08B 1710
Patent
active
050498614
ABSTRACT:
A CO based, Diesel discriminating, fire detection system and method is disclosed which significantly reduces the threshold of CO needed to detect a fire in a mine that also contains CO from Diesel equipment without a corresponding increase in the number of false alarms. The system measures both the CO and NO levels at many points throughout the mine and calculates a CO/NO ratio for each of these locations. A long term average concentration (4 hours) and a short term average concentration (1 hour) for both CO and NO are continually updated to reflect the changing dynamics of the mine environment. Using the CO/NO ratio, the detection system can effectively differentiate between CO produced by a Diesel and CO produced from a fire and can activate an alarm when the CO level resulting from a fire exceeds a predetermined threshold level.
REFERENCES:
Safety in Mines Research, edited by Dai Guoquan, Nov. 1987.
Early fire detection using trace gases in the airstream, Eicker, 1988.
Merits of CO and CO/CO.sub.2 ratios for fire detection in diesel operated mines, Litton.
Early Warning Fire Detection Using Low Level Carbon Monoxide Monitors, Miller, 8-1978.
Grace Richard
Guzman Alberto M.
Purta David A.
American Intell-Sensors Corp.
Crosland Donnie L.
Hofsass Jeffrey A.
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