GB/T 29024.3-2025Determination of particle size distribution - Single particle light interaction methods - Part 3: Light extinction liquid-borne particle counter (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is part 3 of GB/T 29024 "Particle size analysis - Optical measurement of single particles". GB/T 29024 has been published.

The following sections.

--- Part 2: Light scattering liquid particle counter;

--- Part 3: Light obstruction method for liquid particle counters;

--- Part 4: Clean room light scattering particle counter.

This document replaces GB/T 29024.3-2012 "Particle size analysis - Optical measurement of single particles - Part 3: Liquid particle counting" Compared with GB/T 29024.3-2012, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

--- Changed the scope (see Chapter 1, Chapter 1 of the 2012 edition);

--- Changed the terms and definitions of calibration particles (see 3.1, 3.1 of the 2012 edition);

--- Added a chapter on principles (see Chapter 4);

--- Added a chapter on basic configuration (see Chapter 5);

--- Changed some performance requirements (see Chapter 6, Chapter 3 of the 2012 edition);

--- Changed some calibration procedures (see Chapter 7, Chapter 4 of the 2012 edition).

This document is equivalent to ISO 21501-3:2019 "Particle size analysis - Optical measurement of single particles - Part 3: Liquid particle size analysis using the light obscuration method" Particle Counter.

Introduction

Many fields require monitoring of particle contamination, such as the electronics industry, pharmaceutical industry, precision instrument (machinery) manufacturing industry, and medical field.

Particle counters are effective devices for monitoring particulate contamination in liquids. This document is intended to provide testing, calibration procedures and verification for particle counters.

Methods are used to ensure the accuracy of particle counter measurement results and the consistency of measurement results of different instruments.

GB/T 29024 "Particle size analysis - Optical measurement of single particles" is a standard for particle counter testing, calibration and verification methods.

It is mainly used to determine the particle size and quantity in the air or liquid, and consists of four parts.

--- Part 1: Light scattering aerosol spectrometer. Describes the measurement, calibration and verification methods of an optical aerosol particle counter.

--- Part 2: Light scattering liquid particle counter. Describes a method for measuring the size and number of particles suspended in a liquid.

Methods for measurement, calibration and verification of concentrations of light-scattering liquid particle counters.

--- Part 3: Light Obscuration Liquid Particle Counter. Describes a method for measuring the particle size and number concentration of particles suspended in a liquid.

Measurement, calibration and verification methods for light obscuration liquid particle counters.

--- Part 4: Cleanroom light scattering particle counter. Describes the optical particle counter used to determine the particle size distribution of airborne particles.

Methods of measurement, calibration and verification of counters.

Optical measurement method for single particle size analysis Part 3: Liquid particle counters using the light obscuration method

1 Scope

This document specifies a light obscuration liquid particle counter for measuring the size and number concentration of particles suspended in liquids.

The light obscuration liquid particle counter described in this document is based on the measurement of single particles.

The typical particle size range measured by this method is 1 µm~100 µm.

This method is suitable for evaluating the cleanliness of drugs (such as injections, water for injection, intravenous injection solutions), and is also suitable for measuring the particle size in various liquids.

Number concentration and particle size distribution.

This document contains the following.

--- Particle size setting error;

---Counting efficiency;

---Particle size resolution;

--- Maximum particle number concentration;

---Sampling flow error;

---Sampling time error;

---Sampling volume error;

---Calibration interval;

---Test and calibration report.

2 Normative references

This document has no normative references.

3 Terms and Definitions

The following terms and definitions apply to this document.

calibration particle Monodisperse spherical particles of known average particle size, such as polystyrene latex spheres (PSL), whose standard values can be traced back to the International System of Units.

(SI), the standard uncertainty of the average particle size is no more than 2.5%. At a wavelength of 589nm (sodium D line), the refractive index of polystyrene latex spheres is the emissivity is approximately 1.59.

NOTE. For spherical particles, the particle size is equal to the diameter.

Counting efficiency

When measuring a certified standard sample (3.7), the particle number concentration measured by the light obstruction liquid particle counter (3.3) is the same as that of the certified standard sample.

The ratio of the standard value.