Fire Detection Systems Guide - GCG

Conventionalsystemoperationdetection line operationConventional Detection systemsnormally operate on a 24 VDC 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, when a standardbase is used, there is anincompatibility between the currentspecifications of the detector andpanel, leading to incorrect reportingby the control panel, for examplesignalling a fault in place ofanalarm, and in some cases damageto the detector due to over currentin the alarm state.

conventional system operation detection line operation Conventional detection systems normally operate on a 24VDC line. In the standby condition, the

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

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