What is the high alarm limit of oxygen according to the Multi RAE Lite SOG?

The high alarm limit of oxygen according to the Multi RAE Lite Standard Operating Guideline (SOG) is set at 23.5%. This threshold is established to ensure safety in environments where the oxygen concentration can become dangerously elevated. Oxygen levels above the typical atmospheric concentration of 21% can pose risks, as increased oxygen enrichment increases the potential for fire and health-related hazards.

Setting the high alarm limit at 23.5% allows for early warning in situations where oxygen levels may rise, prompting firefighters and other personnel to implement safety measures. The importance of having a high alarm limit like this is to prevent conditions that could contribute to ignition or increase the intensity of a fire, particularly in scenarios involving flammable materials.

Other options provided, such as 21%, 22.5%, and 24%, fall outside the established high alarm limit for oxygen as per the SOG. 21% is the baseline atmospheric concentration and does not indicate an alarm situation, while 22.5% and 24% exceed practical safety measures that would trigger an alarm.