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Uncertainty attached to the results of a calibrated AMS

Abstract : The calibration of a method by comparison with the reference method is commonly used in metrology. If the reference method is supposed to give the true value of the measurand by convention, the uncertainty attached to the results may be rather high. If the uncertainty sources that influence the resuit are randomly contributing to the overall uncertainty of the method, this drawback can be overcome by carrying out several successive measurements, the uncertainty attached to the average value being equal to that of a simple measurement divided by a factor 1/Vn. However, if the reference method is not described accurately enough and influent parameters not ail identified, its implementation may lead to systematic deviations between laboratories Thus, several manual reference methods prepared by CEN working groups have led to confidence intervais of reproducibility higher than expected : e.g. 20% for the manual method for SO2 (EN 14791) determinations. The following question then arises: is it still relevant to use such methods to calibrate an AMS and to check if its variability is acceptable, according to EN 14181? Directives 2001/80/CEE and 2000/76/CEE fix a maximum uncertainty of 20% at the limit value for AMS measuring SO2 and 30% for particulates... The presentation shows how to calculate the uncertainty attached to the results of a calibrated AMS on the whole measuring range and how the uncertainty of the reference method affects the quality of the QAL2 and consequently what is the maximum acceptable uncertainty for the SRM.
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Submitted on : Thursday, April 3, 2014 - 4:29:46 PM
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  • HAL Id : ineris-00972529, version 1
  • INERIS : EN-2006-015



Jean Poulleau, Cécile Raventos, Catherine Yardin, Jacques Lachenal. Uncertainty attached to the results of a calibrated AMS. 7. Conférence Internationale sur les mesures de polluants à l'émission, Feb 2006, Paris, France. pp.280-293. ⟨ineris-00972529⟩



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