At what percentage does the Lower Explosive Limit (LEL) for ammonia start?

Ammonia has a Lower Explosive Limit (LEL) that begins at 15% by volume in air. This means that when the concentration of ammonia in the air reaches 15%, it can create a potentially explosive mixture if exposed to an ignition source. Understanding the LEL is crucial for safety in environments where ammonia is used, particularly in industrial refrigeration systems.

Safety protocols often require monitoring the concentration of ammonia in the air to ensure that it does not reach this dangerous level. Operating below this threshold is essential to prevent an explosion risk in ammonia refrigeration systems.