Combustible gas sensors measure the lower explosive limit
(LEL) of flammable gases, expressed as a percentage of the lowest gas concentration that could result in an explosion if ignited.
Reference is also drawn to the theoretical understanding of flammable vapours with examples of how the Lower Explosive Limit
can be converted into a meaningful quantity or volume of chemical per cubic metre of space.
The condition to ignite an air fuel mixture is the upper and lower explosive limit
of a fuel.
Turning on a light switch is enough to cause an explosion, when the explosive limit
is reached," he said.
t] is the upper limit of blast at t[degrees]C, %; L is the upper explosive limit
at normal temperature (25[degrees]C), %; L is the lower explosive limit
of explosion at normal temperature (25[degrees]C), %; t is the temperature of the combustible gas, [degrees]C.
The monitoring is routinely achieved with a single instrument with multiple sensors that check volume of oxygen, percentage of the lower explosive limit
of a calibrated gas and toxins that may be specific to the operation or could be present.
PHMSA regulations require operators to odorize combustible gas in a transmission line in Class 3 or Class 4 locations "so that at a concentration in air of one-fifth of the lower explosive limit
, the gas is readily detectable by a person with a normal sense of smell.
Gas has a range, from a lower explosive limit
to a higher explosive limit
,'' the district chief said.
At vapor-monitoring points and monitoring wells on the eastern edge of the former landfill, the gas repeatedly has been detected above the minimum explosive limit
of 5 percent of air content, according to county officials.
This range falls between what is called the Lower Flammable Limit (LFL) or Lower Explosive Limit
(LEL) and the Upper Flammable Limit (UFL) or Upper Explosive Limit
If certain charging equipment and/or batteries are not functioning properly, cells are damaged, or ventilation systems are inadequate, H2 generation can be significantly greater than the lower explosive limit
The unit features rapid fail-to-safe continuous gas and vapor monitoring within the lower explosive limit