Field sensors warning

Laboratory measurements use special instmments for highly accurate analysis and field instmments are used for a quick assessment of conditions. Some instmments are attached to workers (personal samplers or dosimeters) to monitor exposures. Some of these dosimeters determine directly if an exposure exceeds the 8-hr TWA. Arrays of sensors, analysis equipment, and alarm systems are managed by computers to provide continuous monitoring for releases. They warn people by triggering evacuation or corrective procedures for equipment. Many of the instmments require regularly scheduled calibration to assure accurate results. There are a wide range of collection procedures and devices. This discussion is a limited review of collection and analysis equipment. 

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