Combustible Gas (LEL) Detectors
Combustible Gas (LEL = Lower Explosive Limit) Detectors monitor concentrations of hydrocarbons, methane, and other industrial gases as a percentage of the lower explosive limit in ambient work-area air at the site. Essential in oil and gas, chemical, and leak-risk facilities to help prevent catastrophic explosions through early warning.
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About this category
LEL detectors protect against one of the largest industrial hazards: explosion from flammable-gas accumulation. The LEL concept: every flammable gas has a minimum air concentration below which ignition cannot occur even with an ignition source; below LEL no ignition (too little fuel); between LEL and UEL (upper explosive limit) ignition is possible; above UEL no ignition (too little oxygen). LEL detectors measure concentration as a fraction of the LEL, where the low end of the scale corresponds to no flammable gas and the top end corresponds to the lower explosive limit itself. Tiered alarm thresholds are used to trigger early warning, evacuation, and urgent shutdown; thresholds are set per model and facility risk assessment. Detection technologies: catalytic bead (historically the most common, burns gas on a catalytic surface and measures reaction heat; needs sufficient oxygen to work), infrared (IR, newer, needs no oxygen, works in oxygen-deficient atmospheres, resists poisoning by silicones, higher cost), and thermal conductivity (for very high concentrations). Applications: oil and gas facilities, refineries, offshore drilling platforms, processing plants, flammable-chemical facilities, underground parking, anaerobic sewage digestion, and fuel-storage facilities. An important technical note: catalytic-bead sensors can be poisoned by silicones, sulfur, or lead; IR is more reliable where those materials are present. Alarm thresholds and product specifications should be reviewed per target gas and site risk before installation.
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LEL detectors protect against one of the largest industrial hazards: explosion from flammable-gas accumulation. The LEL concept: every flammable gas has a minimum air concentration below which ignition cannot occur even with an ignition source; below LEL no ignition (too little fuel); between LEL and UEL (upper explosive limit) ignition is possible; above UEL no ignition (too little oxygen). LEL detectors measure concentration as a fraction of the LEL, where the low end of the scale corresponds to no flammable gas and the top end corresponds to the lower explosive limit itself. Tiered alarm thresholds are used to trigger early warning, evacuation, and urgent shutdown; thresholds are set per model and facility risk assessment. Detection technologies: catalytic bead (historically the most common, burns gas on a catalytic surface and measures reaction heat; needs sufficient oxygen to work), infrared (IR, newer, needs no oxygen, works in oxygen-deficient atmospheres, resists poisoning by silicones, higher cost), and thermal conductivity (for very high concentrations). Applications: oil and gas facilities, refineries, offshore drilling platforms, processing plants, flammable-chemical facilities, underground parking, anaerobic sewage digestion, and fuel-storage facilities. An important technical note: catalytic-bead sensors can be poisoned by silicones, sulfur, or lead; IR is more reliable where those materials are present. Alarm thresholds and product specifications should be reviewed per target gas and site risk before installation.
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