How many readings should be taken for pump calibration when air sampling?

When performing pump calibration for air sampling, the standard practice is to take multiple readings and average them. This approach is essential because it helps ensure the accuracy and reliability of the calibration process. By taking multiple readings, one can account for any variability or potential errors that might occur during a single measurement. Averaging these readings allows for the minimization of any anomalies or fluctuations, resulting in a more precise calibration that reflects consistent performance of the pump.

Relying on just one reading could lead to inaccurate calibration due to chance factors that might influence the measurement, such as fluctuations in pressure or slight variations in the pump's operation. Similarly, while three readings are often considered sufficient, the more readings taken, the better the assurance of accuracy. Weekly calibrations might be necessary depending on the specific requirements of an industry or job function, but they do not directly pertain to how many readings should be taken during the calibration process itself. Thus, the practice of averaging multiple readings is the most reliable method for ensuring effective air sampling pump calibration.