![]() Both elements are heated to a temperature that normally would not support combustion. One element has a catalyst (such as platinum) and one doesn't. The most common sensor used for measuring LEL is the Wheatstone bridge/catalytic bead/pellistor sensor ("Wheatstone bridge").Ī Wheatstone bridge LEL sensor is simply a tiny electric stove with two burner elements. ![]() ![]() Prior to entry of a confined space, the level of flammable gases must be below 10% of LEL. One of the many requirements for entering confined spaces is the measurement for flammable gases.
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