VOC Monitors: Rent or Buy

Use a PID when you need fast total-VOC screening and source hunting. Use compound-specific monitoring or lab sampling when your decision hinges on a specific chemical (benzene, formaldehyde, etc.) or when you need compliance-grade documentation for a regulated substance.

Continuous VOC logging is worth it when you're tracking exposure patterns over a shift, investigating intermittent sources (process releases, solvent use cycles), or need a time-stamped record for a report. If you're just doing a quick source identification or odor investigation, a spot check with a PID is usually sufficient.

Use a standard ppm-range PID for general VOC screening, source identification, and checking whether concentrations are in a range worth further investigation. Use a ppb-range PID when you need to detect very low VOC concentrations (ambient air quality, odor investigations at low levels, sensitive occupant complaints). Use lab sampling (SUMMA canisters, DNPH cartridges, sorbent tubes) when you need to identify specific compounds, compare to regulatory limits with defensible data, or when concentrations are below the detection limit of even a ppb PID.

Reporting PID readings as exact concentrations of a named chemical without noting calibration gas and limitations. Clear notes on instrument setup and assumptions keep results from being misused.

Confirm whether you need personal monitoring or area screening, the expected range (ppm vs. ppb sensitivity), whether you need logging and report export, and what compounds are likely present. Those inputs determine whether you need a wide-range PID, a high-sensitivity PID, or a different sensor.