- LEL - Lower Explosive Limit. The minimum concentration of a combustible gas or vapor in air which will ignite if a source of ignition is present
- UEL - Upper Explosive Limit. Most, but not all, combustible gases have an upper explosive limit which is the maximum concentration in air which will support combustion. Concentrations which are above the U.E.L. are too “rich” to burn.
- PPM - Parts Per Million (toxic & VOC)
- %VOL - Percent by volume (oxygen)
- VOC - Volatile Organic Compounds (PID)
- PID - Photo Ionization Detection (VOC)
- TWA - Time Weighted Average (toxic gases)
- STEL - Short Term Exposure Limit
- IP - Ionization Potential & Ingress Protection
- IS Rating - Intrinsic Safety (UL, CSA)
- T90 - Time sensor needs to reach 90% full response
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