AS NZS 3580.9.6:2015 pdf free download

AS NZS 3580.9.6:2015 pdf free download
AS NZS 3580.9.6:2015 pdf free download.Methods for sampling and analysis of ambient air
4 PRINCIPLE
Ambient air is drawn at a constant flow rate through a prepared filter via a PM 10 size-selective inlet where the suspended particulate matter is inertially separated, with particles larger than PM 10 being retained on a layer of grease. The PM 10 fraction of suspended particulate matter is collected on a prepared filter mounted in the high volume sampler filter holder and subsequently weighed (gravimetric method). The PM 10 concentration is determined by dividing the mass of collected particulate matter by the sample volume, which is calculated from the sample duration and either the average or totalized flow rate.
5.1 PM 10 sampler
The PM 10 sampler shall consist of a PM 10 size-selective inlet fitted to a high volume sampler. The performance of the PM 10 sampler shall comply with requirements described in US Code of Federal Regulations. The sampler shall demonstrate a performance equivalent to a US EPA reference PM 10 sampler, sited and tested under the conditions described in Appendix A. The PM 10 sampler consists of the following:
(a) PM 10 size-selective inlet The PM 10 size-selective inlet shall be a device designed to separate particles and permit only the PM 10 fraction to pass through to the filter. The PM 10 size-selective inlet shall be designed to collect particles of EAD 10 ±0.5 μm at a 50% efficiency, on a mass basis, at a flow rate of 1.13 m 3 /min ±10%.
NOTE: The design has been tested at wind speeds up to 24 km/h; at wind speeds greater than 24 km/h the design cut point may be affected. In practice, however, the size selective inlets are commonly used in wind speeds exceeding 24 km/h.
The flow rate of 1.13 m 3 /min at actual temperature and barometric pressure through the inlet is designed to achieve the PM 10 cut-point of 10 μm.
NOTE: The cut-point will be maintained within acceptable limits if the flow rate is controlled between 1.02 and 1.24 m 3 /min at ambient conditions.
The reference curve for the distribution of particles collected on the filter is shown in Figure 1. Refer to EN 12341 for discussion on the derivation of the reference curve.
Because the collection efficiency of the size-selective inlet is dependent on its geometry, periodic checking, inspection and maintenance is necessary to ensure that the dimensions are within the manufacturer’s specifications.
The performance of size-selective inlets may be affected by the accumulation of particles within the sampler inlet. Regular cleaning and regreasing of size-selective inlets is required in accordance with Clause 8.