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Automatic Fire Alarm Initiating Devices
1
Transcript
Air Sampling Smoke Detectors
(ASSD)
What do they do?
- Detects for presence of smoke and measures quantity of smoke in the air.
How?
- ASSD's use three major components to detect smoke.
Types of Flame Detectors
Light Spectrum
ASSD Three Major Components
Main Types:
- Ultraviolet (UV)
- Near Infrared (NIR)
- Infrared (IR)
- UV/IR
- Dual Infrared (IR/IR)
- Triple Infrared (IR3)
Other Types:
- Ionization current flame
- Thermocouple flame
Types of Heat Detectors
- Fixed temperature
- Rate-of-Rise
- The detector
- Includes fan and detection chamber
- Air sampling pipe
- Usually 3/4" CPVC
- Sampling ports
- Holes drilled in the pipe
Overview
Heat Detectors
- Flame Detectors
- Heat Detectors
- Air Sampling Smoke Detectors (ASSD)
- Questions
What do they do?
- Heat detectors respond to the convected and radiated thermal energy of a fire.
How?
- They detect an increase of temperature with a heat sensitive element.
Air Sampling Smoke Detector
Flame Detectors
What do they do?
- Flame detectors can detect and respond to the presence of flame.
How?
- Using specialized optics, they can detect fire.
Automatic Initiating Devices
QUESTIONS?
By: Bradach Robert
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