In combustible gas indicators, what does the reading in % LRL signify?

In the context of combustible gas indicators, a reading in % LRL stands for the percentage of the Lower Relative Limit, which indicates the lower explosive limit (LEL) of a gas or vapor. It is the minimum concentration of that substance in the air that can ignite if there is an ignition source.

When the reading shows a percentage of LRL, it signifies that the concentration of the combustible gas is at a level that can potentially pose an explosion hazard if it reaches the lower explosive limit. Knowing this percentage is crucial for safety, as it helps responders assess the risk of ignition and take the necessary precautions to mitigate potential hazards.

The lower explosive limit (LEL) is a critical factor in understanding the flammability and explosive properties of gases, and readings at or above this limit require immediate action to ensure safety in environments where combustible gases may be present.