45+ Lel Of Natural Gas US. Lel sensors measure percent of lel. Lel of combustible gases lower explosive level.
Lel and uel explained explosive gas projectmaterials.
Lel sensors require oxygen for combustion and cannot be used in environments that contain less than 10 vol% oxygen. Flammable range for natural gas. 5ppm carbon monoxide means that the air contains 5 per million of carbon. However, natural gas generation has its shortcomings.