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BS EN 16976:2024

BS EN 16976:2024

$198.66

Ambient air. Determination of the particle number concentration of atmospheric aerosol

Published By Publication Date Number of Pages
BSI 2024 60
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This document specifies a standard method for determining the particle number concentration in ambient air in a range up to about 107 cmā€“3 for averaging times equal to or larger than 1 min. The standard method is based on a Condensation Particle Counter (CPC) operated in the counting mode and an appropriate dilution system for concentrations exceeding the counting mode range. It also defines the performance characteristics and the minimum requirements of the instruments to be used. The lower and upper sizes considered within this document are 10 nm and a few micrometres, respectively. This document gives guidance on sampling, operation, data processing and QA/QC procedures including calibration parameters.

PDF Catalog

PDF Pages PDF Title
2 undefined
10 1 Scope
2 Normative references
3 Terms and definitions
3.1 Aerosol properties
11 3.2 Instrument performance
3.3 Flow rates
12 4 Atmospheric aerosol
5 Description of the method
5.1 Sampling and conditioning
5.1.1 Sampling
14 5.1.2 Drying
5.1.3 Dilution
15 5.2 Determination of the number concentration with a CPC
5.2.1 Condensation growth
17 5.2.2 Optical detection
6 CPC performance criteria and test procedures
6.1 General
6.2 General requirements for the CPC
18 6.3 Test conditions
19 6.4 Performance characteristics and criteria
20 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
6.5.5 Instrument-specific assessment of linearity and slope of response
21 6.5.6 Detection efficiency curve at low particle size
6.5.7 Upper particle size detection limit
6.5.8 Zero count rate
6.5.9 Response time
22 6.5.10 Dependence of flow rate on supply voltage
6.5.11 Measurement uncertainty of temperature and pressure sensor calibration
6.5.12 Effect of failure of mains voltage
7 Performance criteria and test procedures for the sampling and conditioning system
7.1 General requirements
7.2 Performance characteristics and criteria
23 7.3 Diffusion losses
7.4 Relative humidity
7.5 Dilution
7.5.1 Dilution factor
24 7.5.2 General criteria for dilution systems
7.6 Primary sampling flow
8 Measurement procedure
8.1 Measurement planning
8.2 Environmental operating conditions
25 8.3 Initial installation
8.4 Initial checks on site
8.5 Data processing and reporting
26 9 Quality control, quality assurance and measurement uncertainty
9.1 General
9.2 Frequency of calibrations, checks and maintenance
9.2.1 General
27 9.2.2 Full maintenance of CPC
9.2.3 Calibration of linearity
9.2.4 Zero check
9.2.5 Number concentration check
9.2.6 Actual flow rate check
28 9.2.7 Temperature and pressure sensor calibration
9.2.8 CPC internal diagnostics
9.2.9 Sample system maintenance
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
29 9.3.2 CPC plateau detection efficiency
9.3.3 CPC detection efficiency drift
30 9.3.4 Flow determination
9.3.5 Correction to standard temperature and pressure
9.3.6 Diffusion losses in the sampling system
9.3.7 Dilution factor (where applicable)
31 9.3.8 Calculation of overall uncertainty
32 Annex A (normative)Determination of diffusion losses in sampling lines
34 Annex B (informative)Example of the calculation of diffusion losses in a sampling system
B.1 Description of the sampling system
35 B.2 Air properties and diffusion coefficient
B.3 Losses in the primary sampling tube
36 B.4 Losses in the secondary sampling tube and the dryer
B.5 Overall sampling losses
37 Annex C (informative)Uncertainty calculation (example)
C.1 General
C.2 CPC plateau detection efficiency
C.3 CPC detection efficiency drift
C.4 Flow determination
C.5 Correction to standard temperature and pressure
C.6 Sampling losses due to diffusion to walls
38 C.7 Dilution factor (where applicable)
C.8 Calculation of overall uncertainty
39 Annex D (informative)Atmospheric aerosols
D.1 General
D.2 Examples of measurements
42 Annex E (informative)Dilution systems
E.1 Background
E.2 Operation principles of dilution systems
E.2.1 General
E.2.2 Dilution systems with partial flow filtration
43 E.2.3 Dilution systems with external clean air supply
44 E.3 Design example of a dilution system for drying the primary sampling flow
45 E.4 Operating parameters of a dilution system
48 E.5 Example for the calculation of the uncertainty of the dilution factor
50 Annex F (informative)Laminar flow
51 Annex G (informative)Coincidence correction
53 Annex H (informative)Results of an experimental comparison of different CPCs

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BS EN 16976:2024
$198.66