What are the two categories of air sampling calibration devices?

The classification of air sampling calibration devices into primary and secondary categories is grounded in their function and purpose in calibration processes. Primary devices are those that provide direct measurement and are recognized for their accuracy and reliability. They are often used as the standard to which other measuring instruments are compared.

On the other hand, secondary devices are generally used for the calibration of primary devices or for specific applications where a primary standard is not available. Secondary devices often include tools that are less precise but still reliable for practical use in a workplace or field setting.

This distinction is important in occupational hygiene monitoring as it ensures that air sampling devices are accurately calibrated, leading to reliable data regarding exposure levels in a work environment. Proper calibration ensures compliance with health and safety regulations and enhances the effectiveness of the monitoring program in controlling exposure to hazardous air pollutants.