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BSI 23/30464870 DC 2023

BSI 23/30464870 DC 2023

$13.70

BS EN 16976. Ambient air. Determination of the particle number concentration of atmospheric aerosol

Published By Publication Date Number of Pages
BSI 2023 56
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PDF Catalog

PDF Pages PDF Title
8 1 Scope
2 Normative references
3 Terms and definitions
3.1 Aerosol properties
9 3.2 Instrument performance
3.3 Flow rates
10 4 Atmospheric aerosol
5 Description of the method
5.1 Sampling and conditioning
5.1.1 Sampling
12 5.1.2 Drying
5.1.3 Dilution
5.2 Determination of the number concentration with a CPC
5.2.1 Condensation growth
14 5.2.2 Optical detection
15 6 CPC performance criteria and test procedures
6.1 General
6.2 General requirements for the CPC
16 6.3 Test conditions
6.4 Performance characteristics and criteria
17 6.5 Test procedures
6.5.1 Calibrated flow rate
6.5.2 Number concentration measurement range
6.5.3 Number concentration detection limit
6.5.4 Calibration factor
18 6.5.5 Instrument-specific assessment of linearity and slope of response
6.5.6 Detection efficiency curve at low particle size
19 6.5.7 Upper particle size detection limit
6.5.8 Zero count rate
6.5.9 Response time
6.5.10 Dependence of flow rate on supply voltage
6.5.11 Accuracy of temperature and pressure sensor calibration
6.5.12 Effect of failure of mains voltage
20 7 Performance criteria and test procedures for the sampling and conditioning system
7.1 General requirements
7.2 Performance characteristics and criteria
7.3 Diffusion losses
21 7.4 Relative humidity
7.5 Dilution
7.5.1 Dilution factor
7.5.2 General criteria for dilution systems
22 7.6 Primary sampling flow
8 Measurement procedure
8.1 Measurement planning
8.2 Environmental operating conditions
8.3 Initial installation
23 8.4 Initial checks on site
8.5 Data processing and reporting
9 Quality control, quality assurance and measurement uncertainty
9.1 General
24 9.2 Frequency of calibrations, checks and maintenance
9.2.1 General
9.2.2 Maintenance of CPC
9.2.3 Calibration of linearity
25 9.2.4 CPC zero check
9.2.5 Number concentration check
9.2.6 Check of the actual flow rate
9.2.7 Temperature and pressure sensor calibration
9.2.8 CPC internal diagnostics
9.2.9 Sample system maintenance
26 9.2.10 Relative humidity sensor
9.2.11 Dilution factor (where applicable)
9.2.12 Leak check
9.3 Measurement uncertainty
9.3.1 General
27 9.3.2 CPC plateau detection efficiency
9.3.3 CPC detection efficiency drift
9.3.4 Flow determination
9.3.5 Correction to standard temperature and pressure
9.3.6 Diffusion losses in the sampling system
28 9.3.7 Dilution factor (where applicable)
9.3.8 Calculation of overall uncertainty
29 Annex A (normative)Determination of diffusion losses in sampling lines
31 Annex B (informative)Example of the calculation of diffusion losses in a sampling system
B.1 Description of the sampling system
32 B.2 Air properties and diffusion coefficient
B.3 Losses in the primary sampling tube
33 B.4 Overall sampling losses
34 Annex C (informative)Data reporting
C.1 Motivation
35 C.2 Level 0 (annotated raw data)
C.3 Level 1 (data processed to final physical property, potential corrections applied, original temporal resolution)
C.4 Level 2 (hourly averages, including measures of variability)
36 Annex D (informative)Uncertainty calculation (example)
D.1 General
D.2 CPC plateau detection efficiency
D.3 CPC detection efficiency drift
D.4 Flow determination
D.5 Correction to standard temperature and pressure
D.6 Sampling losses due to diffusion to walls
37 D.7 Dilution factor (where applicable)
D.8 Calculation of overall uncertainty
38 Annex E (informative)Atmospheric aerosols
E.1 General
E.2 Examples of measurements
41 Annex F (informative)Dilution systems
F.1 Background
F.2 Operation principles of dilution systems
F.2.1 General
F.2.2 Dilution systems with partial flow filtration
42 F.2.3 Dilution systems with external clean air supply
43 F.3 Design example of a dilution system for drying the primary sampling flow
44 F.4 Operating parameters of a dilution system
46 F.5 Example for the calculation of the uncertainty of the dilution factor
48 Annex G (informative)Laminar flow
49 Annex H (informative)Coincidence correction
51 Annex I (informative)Results of an experimental comparison of different CPCs

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BSI 23/30464870 DC 2023
$13.70