JJF 1864-2020 English PDF

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JJF 1864-2020: Calibration Specification for Aerosol Spectrometers
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JJF 1864-2020	509	Add to Cart	4 days	Calibration Specification for Aerosol Spectrometers	Valid

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Basic data

Standard ID: JJF 1864-2020 (JJF1864-2020)
Description (Translated English): Calibration Specification for Aerosol Spectrometers
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A61
Word Count Estimation: 22,282
Date of Issue: 2020-09-11
Date of Implementation: 2021-03-11
Regulation (derived from): Announcement No. 40 (2020) of the State Administration for Market Regulation
Issuing agency(ies): State Administration for Market Regulation

JJF 1864-2020: Calibration Specification for Aerosol Spectrometers

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Calibration Specification for Aerosol Spectrometers National Metrology Technical Specifications of the People's Republic of China Calibration specification for aerosol particle size spectrometer 2020-09-11 released 2021-03-11 implementation Issued by the State Administration for Market Regulation Calibration specification for aerosol particle size spectrometer Focal point. National Technical Committee of Physical and Chemical Metrology Main drafting unit. China Institute of Metrology Hebei Institute of Metrology Supervision and Inspection Henan Institute of Metrology Participated in the drafting. Shanghai Institute of Metrology and Testing Technology Zhejiang Doppler Environmental Technology Co., Ltd. This specification entrusts the National Technical Committee of Physical Chemistry Metrology to be responsible for interpretation The main drafters of this specification. Junjie Liu (China Institute of Metrology) Li Xuanye (Hebei Institute of Metrology Supervision and Inspection) Lu Xingjie (Henan Institute of Metrology) Participating drafters. Ding Zhenmin (Shanghai Institute of Metrology and Testing Technology) Zhang Wenge (China Institute of Metrology) Xiao Ji (China Institute of Metrology) Zou Zongyong (Zhejiang Doppler Environmental Protection Technology Co., Ltd.)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Overview (1) 4 Measurement characteristics (1) 5 Calibration conditions (2) 5.1 Environmental conditions (2) 5.2 Measurement standards and other equipment (2) 6 Calibration items and calibration methods (2) 6.1 Zero point (2) 6.2 Flow rate indication error (2) 6.3 Indication error of particle size measurement (3) 6.4 Particle counting efficiency and counting repeatability (3) 6.5 Indication error of particle mass concentration (4) 7 Expression of calibration results (5) 8 Recalibration interval (6) Appendix A Uncertainty Evaluation Example (7) Appendix B Particle Generation and Mixing System (13) Appendix C Calibration Record Format (14) Appendix D Format of Calibration Certificate (Inner Page) (16)

Introduction

This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1001-2011 "General Measurement terms and definitions", JJF 1059.1-2012 "Measuring Uncertainty Evaluation and Expression" are the basic norms Formulate. In this specification, "particle number concentration" and "particle mass concentration" are respectively quoted from ISO 27891.2015 The content of 3.25 in the calibration of the number and concentration of colloidal particles of the nucleus particle counter and ISO 21501-1.2009 Degree analysis of single particle optical measurement method. Part 1.Light scattering aerosol particle size spectrometer" in 2.7. "Particle counting efficiency and counting repeatability" calibration method reference JJF 1562-2016 "Calibration Specification for Condensation Particle Counter" and GB/T 29024.4-2017 "Particle Size Analysis" Analyze the content of single particle optical measurement method Part 4.Clean room light scattering dust particle counter; The calibration method of "Particle Mass Concentration Indication Error" refers to JJF 1659-2017 "PM2.5 Mass Concentration Measuring Instrument Calibration" Contents in the Code. This specification is released for the first time. Calibration specification for aerosol particle size spectrometer

1 Scope

This specification applies to the principles of light scattering and aerodynamics, particle size measurement range (0.1~100) μm, particle size Particle number concentration measurement range (50~7000)/cm3, particle mass concentration measurement range (30~1000) μg/m3 Calibration of the aerosol particle size spectrometer.

2 Reference documents

This specification refers to the following documents. GB/T 29024.4-2017 Particle size analysis Single particle optical measurement method Part 4.Clean room light scattering dust particle counter For dated reference documents, only the dated version applies to this specification; for undated reference documents, The latest version (including all amendments) is applicable to this specification.

3 overview

Aerosol particle size spectrometer (hereinafter referred to as particle size spectrometer) is mainly used to measure the particle size and concentration of particles in ambient air. degree. Its working principle is. when the measured particles pass through the sampling system of the particle size spectrometer and pass through the light sensitive area at a specific flow rate, The light scattering phenomenon of particles will occur and a scattering signal will be generated. The strength or distance of the light scattering signal is closely related to the particle size. The number of scattered signals is closely related to the particle concentration. Through the photoelectric conversion of the signal, amplification detection and mathematical calculation Calculate, and then use the software and display unit to calculate the particle size and concentration of the sample. The particle size spectrometer generally consists of laser light Source, sampling system, detector, data processing system and other parts.

4 Measurement characteristics

The measurement characteristics of the particle size spectrometer are shown in Table 1. Table 1 Measurement characteristics of particle size spectrometer ......

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