AS NZS 3580.9.17:2018 pdf free.Methods for sampling and analysis of ambient air Method 9.17: Demonstration of equivalence for ambient particulate matter monitoring methods.
4.6 Reference method (RM)
Australian/New Zealand Standard filter-based gravimetric method for the measurement of the particulate matter size fraction under consideration.
4.7 U95
A measurement uncertainty at a confidence interval of 95% according to ISO/IEC Guide 98-3.
5 INSTRUMENT PERFORMANCE
Only instruments that have demonstrated conformance with the requirements of EN 15267, or have obtained US EPA equivalent method status, for the particulate matter size fraction under consideration, shall be acceptable CM. The CM shall be operated in a manner consistent with the configuration and settings used during the demonstration of conformance.
NOTE: The instrument may be used over any range within the limits of the Standards for which it has been tested.
The CM shall be tested under ambient and operational conditions that are representative of its intended use, including conformance with the maintenance, check and calibration intervals recommended by the manufacturer.
6 TEST PROCEDURE
6.1 General
A minimum of two comparisons shall be conducted at a minimum of one in five operating sites under a range of meteorological conditions in accordance with Clause 6.3. Two candidate instruments should be used at each site to assess the between instrument measurement uncertainty.
Laboratories performing the tests outlined in this Standard, including sampling, weighing of filters and analysis of data, shall meet the requirements of AS ISO/IEC 17025.
NOTES:
1 A laboratory may demonstrate conformance with the requirements of AS ISO/IEC 17025 through accreditation by a signatory member of the International Laboratory Accreditation Cooperation (ILAC), Mutual Recognition Arrangement (MRA) with a relevant scope of accreditation to cover the tests being performed.
2 For example, in Australia ILAC (MRA) accredited bodies include National Association of Testing Authorities (NATA).
3 For example, in New Zealand ILAC (MRA) accredited bodies include International Accreditation New Zealand (IANZ).
6.2 Reference method
To ensure the correct operation of the RM, two RM instruments should be used. The mean squared difference of the results of both RM instruments can then be used to estimate the magnitude of the measurement method random error.AS NZS 3580.9.17 pdf download.