gas detectorLEL is the technical term for flammable gas. The lowest explosive concentration of flammable gas in air when exposed to an open flame is called the lower explosion limit (LEL). Vol% is the percentage of volume. Vol is an abbreviation for volume. PPM is the volumetric concentration. Volumetric concentration expression: The volume of pollutants contained in one million volumes of air, i.e. ppm. Ppm is the expression of the concentration of a solution (the mass fraction of a solute), and Ppm is one part per million. For solution: If there is 11000 ml of solute in 1 liter of water, the concentration (mass fraction of solute) is 1 ppm.
Extended information:
Air when exposed to open flamesflammable gasThe maximum concentration is called the upper limit of the explosion, or %uel for short. English: Upper Explosion Limited.
With ordinary infraredgas detectorHere's an example to illustrate the principle of gas detector:
The type of gas can be identified by measuring the absorption spectrum; The concentration of the gas can be determined by measuring the absorption intensity. Infrared gas detectors have a wide range of applications. It can analyze not only gas composition but also solution composition. It has the characteristics of high sensitivity, fast response, online continuous indication, etc., and can form a regulation system.
One is the measurement room, the other is the reference room. The two chambers open and close the optical path simultaneously or alternately for a certain period of time through the optical cutting plate. After the measured gas enters the measuring chamber, the light of a specific wavelength of the measured gas is absorbed, reducing the luminous flux through the measuring chamber and entering the infrared reference chamber.
The higher the gas concentration, the smaller the luminous flux entering the infrared receiving chamber; The luminous flux passing through the reference chamber is fixed, and the luminous flux entering the infrared reference chamber is also fixed. Therefore, the higher the concentration of the gas being measured, the greater the difference in luminous flux between the measurement chamber and the reference chamber.