Air Techniques International

This technical note explores the sources of error in gravimetric measurements used for aerosol photometer calibration, emphasizing the impact of discrepancies in aerosol properties, temporal instability, and flawed experimental procedures. It supports the two-point calibration practice to minimize errors, particularly at lower concentrations, and recommends measures such as improved aerosol systems and automation to enhance calibration accuracy. The findings aim to ensure reliable photometer performance for critical applications.

This technical note discusses the rationale for using two-point calibration and multi-point verification in the calibration of aerosol photometers. It explains the theoretical basis for the linear relationship between photometric response and aerosol mass concentration, highlights practical challenges with multi-point calibration, and advocates for two-point calibration to minimize errors. The combination of two-point calibration and multi-point verification ensures the accuracy and performance of the photometer in critical applications.