What is LEL on a Gas Detector?

What is LEL on a Gas Detector?

Measuring the lower explosive limits (LEL) of flammable gases is an important part of protecting construction workers from flash fires and explosions. Every combustible gas has a lower limit and an upper limit that reflects the minimum concentration necessary for its combustion in air.

What is LEL on a Gas Detector?

LEL is displayed on a gas monitor as a percentage showing how much gas is present in the air. Generally, it’s expressed in parts per million or % Vol. For example, methane has a LEL of 5% and carbon monoxide has an UEL of 12.5%.

What is LEL on a gas detector

Unlike fixed gas detectors that are always on-site, portable LEL monitors need to be powered from a source of electricity to function properly in Gas detection Australia. This power supply may be a battery or solar panel for continuous operation.

What is the Difference Between a Catalytic and Infrared LEL Sensor?

Most Catalytic LEL sensors have a sintered metal flame arrestor that prevents it from starting a fire. However, some hydrocarbon vapors have difficulty diffusing through this flame arrestor. This reduces the output from the LEL sensor.

Why not use a Infrared LEL Sensor?

Infrared LEL sensors are designed to detect a target gas such as methane or propane. They cannot detect other combustibles, including elemental hydrogen and acetylene.

Most of these devices come with conservative default alarm settings that are usually between 10% and 20% of the lower explosive limit. Construction managers would be wise to choose a monitor that allows them to adjust the alarm setting using correction factors.


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