The research on the calibration method of airborne particle counter
Light scattering airborne particle counter is mainly used to detect the concentration of suspen-ded particulate matters in the air.Its resolution to particle size affects the accuracy of measurement in a great extent.The methods of metrological calibration for this performance index mainly refer to interna-tional standard ISO 21501-4:2018 and national calibration specification JJF 1190-2008 standard.How-ever,the test methods,calculation procedure and evaluation limits to the ability of distinguishing parti-cle size in these two standards are quite different,which cause great trouble to the personnel of instru-ment development,using and measurement.In this paper,targeted experimental tests were carried out according to the above two standards.Through the analysis of the experimental data,it is shown that ISO standard has higher requirements on particle size resolution but the testing method is complex,while JJF standard is relatively simple and easy to implement.In order to ensure the convenience and accuracy of the measurement,JJF test which improves the index requirement of particle size distribution error was adopted.Through further study,it is determined that the size distribution error of 0.6 µm and 0.4 μm can meet the requirements of JJF and ISO standards at the same time when the size distribution error is controlled within 10％.Through the actual detection application research,it is suggested that the parti-cle counter with particle size distribution error in critical state should be avoided in the environment with high requirement of cleanliness.
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