What is the difference between parameters for gas detection ppm and lel ?when to use ppm and when to use lel? - lel gas detector
While measuring the concentration of the gas used in all gas detectors. What are the things that are observed? What is the difference between ppm and lel. when measuring ppm LEL and where to use them?
Friday, January 22, 2010
Lel Gas Detector What Is The Difference Between Parameters For Gas Detection Ppm And Lel ?when To Use Ppm And When To Use Lel?
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*... Lying is "lower explosive limit" is a certain percentage of the gas concentration in the air lighted in the mixture.
(There is also a helicopter (or (LSE) or higher (high) explosive limit).
The% of the gas in the air must be within these limits in order to burn. For example, propane gas LEL is 2.1% in the air and HEL was 10.4% in the air. Switch Below or above these limits can not be propane.
*... ... ppm parts per million, which is typically used to detect harmful gases such as hydrogen sulfide (H2S) for sale.
*.. The H2S gas is flammable, toxic, and acid, which irritates the eyes and mucous membranes in concentrations of 20 to 150 ppm. Somewhat higher concentrations irritate the upper respiratory tract.
*.. The inhalation of 500 ppm for 30 minutes, headache, dizziness, excitation and gastric complaints.
*.. Concentrations above 600 ppm can be fatal within 30 minutes due to respiratory paralysis.
*.. Smell alone can not be used to detect the presence of H2S, because the deterrent effect that the olfactory nerves. The gas destroys the sense of smell in the cooperation within the frameworkncentrations.
As a matter of interest, flammable (explosive) limits of H2S are up 4.3% to 46% in the air ... A wide range of flammability.
Ppm = parts per million.
LEL = Lower Explosive Limit level.
The LEL measurement shall be used only for the suspect to explosive gas (such as propane, for example). For each type of mixture of explosive gases in the air when it is at a certain concentration, it is explosive, but below this concentration can not be used. Everyone has a different explosive gas-LEL.
Ppm are measured when the gas is toxic.
Hope this helps.
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