What does LEL meter stand for?
The term L.E.L. stands for Lower explosive limit of a combustible gas or vapor. It’s the lowest level a gas can ignite in air in the presence of an ignition source. Conversely, U.E.L (upper explosive limit) is the maximum level in air that a gas may ignite.
What is LEL system?
A LEL monitoring system is an analytical system able to check and control solvent concentration inside the drying stations during any printing or laminating process.
How does an LEL monitor work?
A catalytic bead LEL sensor senses a combustible gas through flameless combustion that occurs with the help of electrically produced heat and a catalyst material coating on the sensing bead. In other words, a CB LEL sensor detects gas through the actual burning of the gas.
What is the purpose of an Explosimeter?
An instrument used to detect explosive atmospheres. When the lower explosive limit (LEL) of an atmosphere is exceeded, an alarm signal on the instrument is activated. Also called a combustible gas detector.
What is the difference between LEL and LFL?
Lower flammability limit (LFL): The lowest concentration (percentage) of a gas or a vapor in air capable of producing a flash of fire in the presence of an ignition source (arc, flame, heat). The term is considered by many safety professionals to be the same as the lower explosive level (LEL).
How do you read LEL readings?
When interpreting the reading on a combustible gas indicator, the readings represent the percentage of LEL. The important thing to remember is that the LEL is stated as a percentage of concentration of a gas in the atmosphere while the meter reading is displayed as a percentage of that concentration.
How do you calculate LEL?
To compute the LEL of any gas in air, divide the unknown concentration by the LEL listed in the NFPA Handbook. 100% LEL’s for 9 of Gasco’s more common gasses are shown in the table to the left. For example, if you take 2.5% Methane in air and divide it by 100% LEL of methane (5%), the result is 50% LEL.
What is an acceptable LEL?
An oxygen content of 19.5 percent can support life and is adequate for entry. 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.
What is the difference between Tankscope and explosimeter?
2. Tankscope or Non-combustible Gas Indicator. It works on the same principle as that of an explosimeter except that the gas does not burn inside the sample chamber; there is an alteration in the temperature of the heated filament which enhances the change in resistance.
Who will use explosimeter?
Explosimeter is device that is used to determine the content of hydrocarbon in the atmosphere of pump room or tank spaces on ships. The scale used in the explosimeter is marked in terms of lower explosive or flammable limit and as a percentage of the lower limit (LEL).
What is a safe LEL level?
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.
What is LEL and UFL?
The lower flammable limit (LFL) describes the leanest mixture that still sustains a flame, i.e. the mixture with the smallest fraction of combustible gas, while the upper flammable limit (UFL) gives the richest flammable mixture. In an explosive mixture the fuel oxidizer mixture is closer to stoichiometric proportion.
What does Lel on a gas monitor mean?
LEL Gas Monitor. An LEL Monitor is an instrument used to detect hazardous levels of a combustible gas or solvent vapor in air, expressed in % LEL, or Lower Explosive Limit. An LEL Monitor is also referred to as an LEL Gas Detection System, LEL Gas Detector or simply a fixed gas detection system.
How do LEL sensors work?
A catalytic bead LEL sensor senses a combustible gas through flameless combustion that occurs with the help of electrically produced heat and a catalyst material coating on the sensing bead. In other words, a CB LEL sensor detects gas through the actual burning of the gas.
What is a LEL detector?
An LEL Detector is an essential component of a fixed gas detection safety instrument for LEL safety and so monitors, indicates and alarms when levels of LEL exceed 0% to indicate the presence of combustible gas or solvent vapor. This is well before a combustible fuel/air mixture exists near the LEL analyzer.