BS ISO 21501-4:2018+A1:2023

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Determination of particle size distribution. Single particle light interaction methods – Light scattering airborne particle counter for clean spaces

Published By	Publication Date	Number of Pages
BSI	2023	40

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Description

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PDF Pages	PDF Title
2	National foreword
6	Foreword
7	Introduction
9	1 Scope 2 Normative references 3 Terms and definitions
10	4 Principle
11	5 Basic configuration 6 Requirements 6.1 Size setting error
12	6.2 Counting efficiency 6.3 Size resolution 6.4 False count 6.5 Maximum particle number concentration 6.6 Sampling flow rate error 6.7 Sampling time error 6.8 Response rate
13	6.9 Calibration interval 6.10 Reporting of test and calibration results 7 Test and calibration procedures 7.1 Size setting 7.1.1 Evaluation of size setting error
14	7.1.2 Procedure of size setting
17	7.2 Evaluation of counting efficiency 7.2.1 Parallel comparison method
18	7.2.2 Generator method 7.3 Evaluation of size resolution
19	7.4 Evaluation of false count
20	7.5 Estimation of coincidence loss at the maximum particle number concentration 7.6 Evaluation of sampling flow rate error 7.7 Evaluation of sampling time error 7.8 Evaluation of response rate
22	Annex A (informative) Counting efficiency
30	Annex B (informative) Size resolution
31	Annex C (informative) False count
32	Annex D (informative) Response rate
33	Annex E (informative) Procedure for evaluating the uncertainties of the results of the performance tests
39	Bibliography

Additional information

Status	Definitive
Title	Determination of particle size distribution. Single particle light interaction methods – Light scattering airborne particle counter for clean spaces
Replaces	BS ISO 21501-4:2007
Publisher	BSI
Committee	LBI/37
Pages	40
Publication Date	2023-02-13
ISBN	978 0 539 13723 1
Standard Number	BS ISO 21501-4:2018+A1:2023
Identical National Standard Of	ISO 21501-4:2018/Amd 1
Descriptors	Air, Air pollution, Calibration, Clean rooms, Contaminants, Counting, Light divergence, Optical measurement, Particle size distribution, Particle size measurement, Particulate air pollutants, Particulate materials, Test equipment, Verification
Amends	BS ISO 21501-4:2018
ICS Codes	19.120 - Particle size analysis. Sieving

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BS ISO 21501-4:2018+A1:2023

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