Uel - What is Upper Explosive Limits (UEL)?

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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Description: LEL Sensors Limitations Two mechanisms affect the performance of Wheatstone bridge LEL sensors and reduce their effectiveness when applied to all but methane.

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This is the lowest concentration in the atmosphere of a gas or vapor that is required to generate a flash or a fire.
In the Detector these charged particles produce a current that is then amplified and displayed on the meter as "ppm" parts per million or even in "ppb" parts per billion.

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