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The Lower Explosive Limit (LEL) varies from gas to gas, but for most flammable gases it is less than 5% by volume. This means that it takes a relatively low concentration of gas or vapour to produce a high risk of explosion.
An LEL Detector or LEL Meter detects dangerous levels of a combustible gas or solvent vapor in air, expressed in percent Lower Explosive Limit, or LEL. An LEL Detector is an integral part of a complete gas detection system and can be referred to as a Gas Detector or just a fixed gas detection system.
For example, an unleaded petrol may have a lower explosive limit of 1.4% and an upper explosive limit of 7.6%. Acetone may have an LEL of 2% and a UEL of 13%. Ethanol may have an LEL of 2.5% with an UEL of 13.5%.
These methods are referenced in OSHAs 1910.106 standard. Flammable liquid is any liquid having a flashpoint at or below 199.4 F (93 C).
Atmospheres with a concentration of flammable vapors at or above 10 percent of the lower explosive limit (LEL) are considered hazardous when located in confined spaces. However, atmospheres with flammable vapors below 10 percent of the LEL are not necessarily safe. Such atmospheres are too lean to burn.

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Atmospheres with a concentration of flammable vapors at or above 10 percent of the lower explosive limit (LEL) are considered hazardous when located in confined spaces. However, atmospheres with flammable vapors below 10 percent of the LEL are not necessarily safe.
But OSHAs Confined Space Standard specifies a maximum percent LEL of 10 percent for work inside a confined space. However, some plants will not do hot work if any positive reading at all shows up on an analyzer. Others use readings of one percent or three percent of the LEL as their cut-off point.

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