Page 30 - AP2464B E-BOOK (KKR2 TOWER)
P. 30
Source: www.warwickshire.gov.uk/firealarmsystems
HOW DOES IT WORK?
SMOKE DETECTOR HEAT DETECTOR
Inside the smoke alarm, there is an L.E.D Inside the heat alarm, there are two
light and sensor at bottom of the detector. thermistor. Partially sealed a exposed to air.
As smoke enters the detector, the smoke For rate-of-rise response, fire detected on
particles interrupt the light beam, scattering
it in many directions. fast increase of ambient temperature.
Deflected beams from the L.E.D light For fixed temperature response, fire
scatter toward the light sensor. When light detected on slow increase of ambient
beams hit the sensor, the alarm will turn on. temperature. The alarm will turn on.
