320-03 Attachment Alarm Values
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Questions and Answers

What is the A1 alarm value for oxygen deficiency?

  • 20.5%
  • 19.5% (correct)
  • 21.0%
  • 19.0%

    • Which gas has an A2 alarm value of 50ppm?

  • Hydrogen Cyanide
  • Organic Vapors
  • Carbon Monoxide (correct)
  • Hydrogen Sulfide

    • What is the A1 alarm value for the Lower Explosive Limit (LEL) of methane?

  • 10% (correct)
  • 15%
  • 5%
  • 20%

    • Which of the following gases has the highest A1 alarm value?

    <p>Carbon Monoxide</p> Signup and view all the answers

    What is the A2 alarm value for Hydrogen Sulfide?

    <p>15ppm</p> Signup and view all the answers

    Which of the following compounds is NOT detected by the OV sensor?

    <p>Methane</p> Signup and view all the answers

    Study Notes

    Oxygen Alarm Values

    • A1 Alarm: 19.5% indicates oxygen deficiency, posing a risk to health.
    • A2 Alarm: 23.5% indicates oxygen enrichment, which can cause increased fire risks.

    Lower Explosive Limit (Methane)

    • A1 Alarm: 10% LEL indicates the lower threshold for explosive risk.
    • A2 Alarm: 20% LEL indicates increased potential for explosion.

    Carbon Monoxide Alarm Values

    • A1 Alarm: 35ppm is the threshold for significant health concerns.
    • A2 Alarm: 50ppm represents a critical level requiring immediate action.

    Hydrogen Sulfide Alarm Values

    • A1 Alarm: 10ppm signifies health risks, as it is highly toxic.
    • A2 Alarm: 15ppm raises the severity of the hazard.

    Hydrogen Cyanide Alarm Values

    • A1 Alarm: 2.5ppm indicates a dangerous, potentially lethal exposure level.
    • A2 Alarm: 4.5ppm further escalates the risk of poisoning.

    Organic Vapors Alarm Values

    • A1 Alarm: 5ppm is the limit for health concerns associated with organic vapors.
    • A2 Alarm: 10ppm increases the danger related to organic vapor exposure.

    Organic Vapor Sensor Detection

    • Detects 12 different compounds, highlighting the range of potential chemical hazards:
      • Ethylene oxide
      • Propylene oxide
      • Ethene
      • Propene
      • Vinyl chloride
      • Methanol
      • Ethanol
      • Acetaldehyde
      • Butadiene
      • Formaldehyde
      • Vinyl Acetate
      • Isopropanol

    Supersession History

    • SOG #1525 issued on 07/01/2005 and revised on 11/03/2017.
    • SOG #320-03 Attachment A underwent clerical changes on 05/01/2018.
    • Recent revisions occurred on 07/21/2021, providing updated context and clarity on alarm values.

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    Related Documents

    320-03 ATTACHMENT A A1-A2 ALARM VALUES.pdf

    Description

    Test your knowledge on the alarm values for oxygen, LEL, and carbon monoxide as outlined in SOG 320-03. This quiz will focus specifically on A1 and A2 alarm thresholds. Perfect for fire rescue professionals looking to refresh their understanding of safety protocols.

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