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LEL 0-100% LEL Measurements

In order for a substance to ignite, it must essentially mix with air at a certain rate. This ratio differs according to the properties of the combustible materials and is expressed in a range of values. The lower limit at which a combustible material can explode in air is called the Lower Explosion Limit (LEL). These values ​​are also used for flammability, but lower explosion limit (LEL) is more commonly used because it does not contain a large difference. For example, the lower explosion limit (LEL value) of ammonia is 16 percent, 4 percent of hydrogen sulfide, 1,3 percent of gasoline, 7,3 percent of methyl alcohol and 5 percent of methane.

To ensure fire and explosion protection in a working environment, flammable vapors in the environment must be below LEL values. Gas measuring detectors used to measure the presence of flammable substances, which are generally found in closed environments, divide the LEL values ​​into fractions (eg 0-100% LEL). The best result is that the LEL value is zero in the measurement devices. However, a warm and hot work permit should be given in this case. The LEL values ​​to be considered are:

  • If the level is between 0-5 and the level is allowed, the entry is allowed and sparks can be performed.
  • If the level is between 5 and 10, sparks are stopped.
  • If the level is between 10-25 and XNUMX-XNUMX, it is considered a situation requiring extraordinary attention and is not allowed.
  • If the level is above the 25, there is danger of an explosion, the measure is taken and the work area is abandoned.

Ignition limit values ​​for various substances have been determined. However, if there is a gas mixture in the environment, the calculation is made based on the concentration and ignition limits of the components that make up this mixture.

Our company performs LEL 0-100% LEL measurements within the scope of gas measurements. In these studies In accordance with the relevant legal regulations, standards and test methods published by domestic and foreign organizations.

In the meantime, our organization, ÖSAS Accreditation Agency, It is accredited according to TS EN ISO / IEC 17025 standard and the tests, measurement, analysis, inspection and inspection procedures and reports are accepted as valid in private and official audits.