Where Do PIDs Fit into Confined Space Entry?
To understand where a photo-ionization detector fits into confined space entry, one must first understand what a PID measures and how it works. A PID is a general, non-specific detector of volatile organic compounds, commonly referred to as VOCs. Organic compounds are chemical compounds that contain at least one atom of carbon or a carbon chain. Because carbon is the basis of all compounds, organic compounds are found in all living things. Volatile organic compounds are organic compounds that can easily become vapors or gases from the solid or liquid state. Along with carbon, volatile organic compounds can also contain oxygen, hydrogen, chlorine, and sulfur atoms, to name a few. VOCs can be found in almost everything, from solvents to air pollution. Some common VOCs in the petrochemical industry are gasoline, benzene, toluene, and xylene. However, VOCs exist not only in industry, but also in everyday products including paint thinners and solvents, glues, degreasers, aerosol sprays, pai
