Fire Detection Systems Overview
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Fire Detection Systems Overview

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Questions and Answers

What triggers the activation of the warning system in the Lindberg fire detection system?

  • Cooling of the sensing element
  • Depletion of the inert gas
  • Decrease in pressure within the tube
  • Rise in ambient temperature (correct)

    • How does the titanium wire function within the Systron-Donner system?

  • By sealing the tube at one end
  • As a conduit for electrical switches
  • As the gas absorption material (correct)
  • By enhancing gas pressure stability

    • What is the relationship between pressure and temperature in the Lindberg fire detection system?

  • There is no relationship between pressure and temperature
  • Pressure increases with rising temperatures (correct)
  • Pressure increases with lower temperatures
  • Pressure decreases when temperature rises

    • During testing of the Lindberg system, what happens when the test switch is released?

    <p>The discrete material reabsorbs the gas</p> Signup and view all the answers

    What is a distinguishing feature of the Systron-Donner pneumatic system compared to the Lindberg system?

    <p>Utilization of helium gas</p> Signup and view all the answers

    In the inspection and maintenance of the Lindberg system, which component is primarily tested?

    <p>The control unit wiring</p> Signup and view all the answers

    Which material inside the Lindberg system absorbs gas when heated?

    <p>Gas absorbing material</p> Signup and view all the answers

    What component of the Systron-Donner system is responsible for maintaining closed switch contacts?

    <p>Gas pressure in the tube</p> Signup and view all the answers

    What is the primary purpose of a smoke-detection system in aircraft?

    <p>To detect the presence of smoke indicating a fire</p> Signup and view all the answers

    What is the primary function of the change in electric current flow within a smoke detection system?

    <p>To trigger a warning indication</p> Signup and view all the answers

    Which type of smoke detector system uses light reflection to detect smoke?

    <p>Photoelectric type</p> Signup and view all the answers

    At what smoke concentration level does the photoelectric cell start reflecting light to indicate a warning?

    <p>10%</p> Signup and view all the answers

    How does the photoelectric smoke detector amplify the output signal?

    <p>With a built-in amplifier circuit</p> Signup and view all the answers

    Which type of fire condition does the smoke detection system primarily respond to?

    <p>Smoldering fires producing smoke</p> Signup and view all the answers

    What components are connected to the 'VENTURI EJECTOR' in the smoke detection system?

    <p>AFT and bulk cargo compartment smoke detectors</p> Signup and view all the answers

    What type of gases can smoke detection systems monitor that may indicate a fire condition?

    <p>Carbon monoxide and nitrous oxides</p> Signup and view all the answers

    What component's activation is indicated by the illumination of the warning light and the sound of the bell?

    <p>Test Switch</p> Signup and view all the answers

    Under what condition does the alarm switch close in the Systron-Donner system?

    <p>When the temperature exceeds a pre-set level</p> Signup and view all the answers

    What occurs after a fire has been extinguished in the fire detection system?

    <p>The titanium wire absorbs hydrogen gas and breaks responder contacts</p> Signup and view all the answers

    Which of the following describes the configuration of fire detection loops to enhance system reliability?

    <p>Dual-loop configuration is utilized</p> Signup and view all the answers

    What happens if one loop fails in the dual-loop configuration?

    <p>The control box isolates the defective loop and reconfigures to single-loop operation</p> Signup and view all the answers

    What distinguishes average temperature sensing from discrete temperature sensing in fire detection mechanisms?

    <p>Discrete sensing is triggered by localized heat sources</p> Signup and view all the answers

    How are multiple sections of fire elements connected in the installation?

    <p>By small plugs and sockets</p> Signup and view all the answers

    What is the role of the integrity switch in the fire detection system?

    <p>To break the supply from the test switch if gas leaks occur</p> Signup and view all the answers

    Which material is primarily responsible for the fire warning function in the system?

    <p>Titanium wire</p> Signup and view all the answers

    Study Notes

    Fire Detection Systems

    • Lindberg System:
      • Utilizes a stainless-steel tube filled with inert gas and a gas-absorbing material.
      • When heat is detected, the material releases gas, increasing tube pressure and activating a warning system.
      • Tested using a low-voltage AC current to release gas and activate the warning system.
      • The test confirms the integrity of the control unit, wiring, and detector element.
    • Systron-Donner System:
      • Employs a stainless-steel tube filled with helium gas and a titanium wire acting as the gas-absorbing material.
      • An increase in tube temperature releases hydrogen from the wire, triggering the alarm system.
      • The system uses a dual-loop configuration for increased reliability, both loops need to sense a fire before the alarm sounds.
      • If one loop fails, the system isolates the defective loop and continues with single-loop operation.

    Overheat Detection System

    • Uses a variety of detector switches for different temperature ranges.
    • For example, "HP AIR DUCT O/HEAT DETECTOR SWITCH" is set to 350° ±15°C.

    Smoke Detection Systems

    • Functionality:
      • Samples cabin air for smoke, indicating a potential fire condition.
      • Used in cargo compartments, equipment bays, and lavatories.
      • Detects the presence of carbon monoxide (CO) and nitrous oxides as early warning signs.
      • Smoke detection system triggers a warning indication when a change in electrical current flow is detected.
    • Types of Smoke Detectors:
      • Photoelectric (comparison and refraction types)
      • Ionisation type.
    • Refraction Photoelectric Systems:
      • Air passes through a chamber.
      • A pilot lamp illuminates the photocell, decreasing circuit resistance and activating the warning system.
      • Smoke entering the chamber at a concentration of about 10% reflects light onto the photo diode and the photoelectric cell.
      • The photoelectric cell output is amplified to trigger a warning device.
      • A small test light illuminates the photoelectric cell to activate the system for testing.

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    Description

    This quiz covers various fire detection systems, including the Lindberg and Systron-Donner systems. Explore their mechanisms, testing methods, and reliability features. Understand the technology behind these crucial safety systems in fire management.

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