Name one primary air calibration device.

The Gilibrator, Defender, TSI Model 4146/4046, and inverted burette are all primary air calibration devices because they are specifically designed to provide accurate measurements of air flow rates and calibrate other measuring equipment. These devices utilize precise methods and standards to ensure that the data obtained from air sampling equipment is accurate and reliable.

For instance, the Gilibrator is a well-known device for calibrating flow meters and ensuring that sampling pumps measure airflow correctly. The TSI models are also highly regarded for their accuracy in measuring airflow in various environmental and industrial applications. The inverted burette is used as a standard to determine the volume of air in various calibration scenarios. All of these devices play a significant role in occupational hygiene by ensuring that air quality monitoring equipment is calibrated correctly, thus providing reliable data for assessing exposure levels to airborne contaminants.

In contrast, the thermal imager is typically used for detecting heat patterns and identifying thermal anomalies. The sound level meter measures sound levels and does not pertain to air flow calibration. Meanwhile, the pitot tube is primarily used for measuring fluid flow velocities, typically in liquids or gases, rather than for calibrating air sampling devices. Therefore, they do not serve the specific function of primary air calibration in the same