What should be recorded during the pre-calibration phase of air sampling?

During the pre-calibration phase of air sampling, it is essential to capture multiple calibration readings and calculate their average to ensure the accuracy and reliability of the air sampling results. Taking five calibration readings allows for a more comprehensive assessment of the instrument's performance, as this process helps identify any potential variances or inconsistencies in the measurements. By averaging these readings, an operator can establish a baseline that better reflects the instrument's true calibration state.

In addition to this, other factors such as temperature and humidity can influence the calibration process, but they are not the primary focus during the pre-calibration phase, which is primarily centered on obtaining and averaging those calibration readings. Only relying on the final calibration reading or visual inspection notes would not provide sufficient data for a comprehensive evaluation of the instrument's performance before actual air sampling begins.