Fire Detection Alarm And Suppression
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The most basic alarm system is initiated how?
Manually
What is the most reliable type of suppression system?
Automatic sprinklers
A pull handle alarm system is referred to as what?
Local warning system
Fixed temp heat detectors
Are the least prone for false activations Are activated when they are heated to a set temp
How many devices for fixed temp
3 Fusible link Frangible bulb Continuous line
Fusible device
Held by solder and melts when heated
Frangible bulb
Liquid in glass bulb breaks when a rates temp is reached
Continuous line device
Detects heat over a linear area parallel to the detector
Bimetallic detector
Two metals with different thermal expansion rates that strip an alarm when heated
Rate of rise detector
Temp exceeds 12 to 15 degrees in one min sounds alarm
Pneumatic rate of rise spot detector “ “ rate of rise line
Is most common type Hike allows air to enter and exit which reads normal atmospheric temps Line covers more area
Rate compensated detector
Signals when regular temp changes slower than those under fire conditions
Thermoelectric detector
Two wires of dissimilar metals twist together and creat an electrical current
Smoke detectors
Non residential or large multiple family Barracks /hotels Detect smoke but send a signal to another device to sound alarm
Smoke alarms
Family homes Detect smoke and sound alarm
Photoelectric smoke detectors use how many ways to detect smoke?
2 Beam application Refractory spoil application
Beam application
Uses a beam of light to a censor when the light is blocked by smoke the alarm sounds
Refractory photocell
Light beam reflects off smoke hitting a censor sounding alarm
Photoelectric smoke Alarms are more sensitive when the fire is…..
Smoldering
Ionization detectors
respond when the flame is present and uses the irons released from the flame to alarm
What are the two main ways to power these desires?
Batteries and household currents
What are the two types of flame detectors?
Ultraviolet Infrared Are the most sensitive devices
Gas detectors
Alarm when a set gas is released into the atmosphere
Combination detectors
Multiple devices combined