This is the lowest concentration in the atmosphere of a gas or vapor that is required to generate a flash or a fire.
What does a PID measure..
Department of the Interior, Bureau of Mines.
University of East London
While useful in a wide variety of applications, in some settings Wheatstone bridge LEL sensors either don't have enough sensitivity to a particular chemical, or chemicals used in the environment can render the Wheatstone bridge sensor inoperable.
A Photo-Ionization Detector measures VOCs and other toxic gases in low concentrations from ppb parts per billion up to 10,000 ppm parts per million or 1% by volume.
Below this level, the mixture is too "lean" to burn.
What is Upper Explosive Limits (UEL)?
The University of Minnesota provides some other analogies that may help you visualize the scale involved with PPM.
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Over 80,000 Loyalists fled from the country, some overland, but the majority by ship, with over half going to British possessions in Canada; Nova Scotia, New Brunswick, and Quebec. This was the largest group of immigrants to Canada at any one time. Many families ended up at refugee camps near Sorel Quebec for the winter of 1783.
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