Transcription of Fire detection systems
{{id}} {{{paragraph}}}
Example: dental hygienist
Fire detection systems
Fire detection Systemscontentsintelligent fire alarm systemsconventional fire alarm systemsdetector application guide4915 Fire detection systems 8/8/06 11:46 Page 3principle of operationA conventional fire alarm systemnormally consists of a control panellinked to a number of lines of firedetectors and manual call points,normally called detection zones,and a number of sounder or alarmcircuits. A simple system is shownin Figure panelThe control panel drives thedetection zones and soundercircuits, provides LED indications of fire, fault or normal conditionsand contains switches to allow thesounders to be activated or silencedand the detectors to reset followingan alarm. The control panel ispowered from the mains (230 VAC)and will contain back-up batteriesto allow the system to function for a minimum of 24 hours, dependanton the application, in case of amains : There are numerous suppliersof fire control equipment and firedetection devices.
should be able to specify which detector bases should be used with different detector brands. A manual call-point consists of a simple switch with a resistor in series with it, usually 470 Ohms or 680 Ohms. When the call point is activated, the resistor is switched across the line, and a current of 50-80mA, dependant on the control panel, is drawn.
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: