Fire Detection Systems Guide - gcg-es.com

← Back to document page

Conventionalsystemoperationdetection line operationConventional Detection systemsnormally operate on a 24VDC the standby condition, thedetectors will draw a low current,typically less than 100 A. When thedetector senses a fire , it will switchinto the alarm condition with it'sLED illuminated, and will collapsethe line voltage by drawing a largercurrent - dependant on thedetectors and control panel, buttypically 50-80mA. The controlpanel can sense this, and activatethe appropriate alarms. Thedetector will remain latched in thealarm state with its LEDsilluminated, even if the smokeorheat is removed until it has beenresetfrom the panel by momentarilyremoving powerfrom the allows the fire to be locatedeven if the signal is intermittent,orto locate possible sourcesofnuisance some control panel - detectorcombinations.

The simplest end of line device is a resistor, which will draw a current distinct from the quiescent and alarm currents drawn by the detectors. Installation of detectors

  Guide, System, Fire, Detection, Fire detection systems guide