At what percentage are alarms for Lower Explosive Limits (LEL) typically set in atmospheric testing equipment?

Alarms for Lower Explosive Limits (LEL) in atmospheric testing equipment are typically set at 10%. This percentage is critical because it provides an early warning for potential explosive hazards in the environment. When LEL alarms activate at 10%, it alerts personnel that the gas concentration in the atmosphere has reached a significant level that poses a risk for combustion. This threshold allows for proactive safety measures to be implemented before reaching higher concentrations that can lead to dangerous situations. Properly understanding this percentage helps ensure a safer work environment in locations where flammable gases may be present.