ISO 8573-4:2019 PDF

Compressed air — Contaminant measurement — Part 4: Particle content

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Title (English):

ISO 8573-4:2019

Compressed air — Contaminant measurement — Part 4: Particle content

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 26
Publication date:: February 19, 2019
Edition:: ISO IS 8573 edition 2 version 1
ICS:: 71.100.20

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Description (English):

This document provides a method for sampling compressed air and a guide for choosing suitable measuring equipment to determine its particle size and concentration by number (to be referenced as "concentration" throughout this document). It also describes the limitations of the various measurement methods and describes the evaluation and uncertainty considerations. This document will report the particle size and concentration of all types of particle combined and does not aim to be able to segregate the separate solid and liquid particle fractions. When it is required that the concentration of a specific fraction is to be determined then recourse to the relevant standard method from the ISO 8573 series is recommended. NOTE 1 The test methods described in this document are those suitable for determining the purity classes given in ISO 8573‑1. NOTE 2 Particle content determined as concentration by mass is dealt with in ISO 8573‑8. NOTE 3 This document does not address instances where non-isothermal conditions exist, and separate arrangements should be made where particles may be formed by vapour condensation or lost through evaporation.

Technical details

Technical committee: ISO/TC 118/SC 4 - Compressed air treatment technology
SKU: ISO 8573-4:2019

Abstract

Overview

ISO 8573-4:2019 - Compressed air - Contaminant measurement - Part 4: Particle content - specifies methods for sampling compressed air and selecting suitable measuring equipment to determine particle size and particle concentration (by number). The standard describes measurement limitations, evaluation and uncertainty considerations, and reporting formats used to assess particle-related purity classes in accordance with the ISO 8573 series. It reports the combined particle content (solid + liquid) and excludes mass‑based concentration (see ISO 8573‑8) and non‑isothermal condensation/evaporation scenarios.

Key Topics

Scope & purpose
- Sampling procedures and guidance for choosing measuring instruments.
- Reporting particle size and number concentration for compressed air.
Measurement methods
- Sampling-disc microscopy (light optical microscopy) - practical for particles ≥ 5.0 µm.
- Scanning electron microscopy (SEM) - capable down to ≈ 0.005 µm.
- Optical particle counters / optical aerosol spectrometers (OPC / OAS) - typical range ~0.06 µm to ≤100 µm.
Sampling techniques
- Full‑flow and partial‑flow sampling; guidance on isokinetic sampling and diffusers (see informative annexes).
- Considerations for sampling duration, flow measurement, and avoiding contamination.
Instrument considerations
- Instrument selection, calibration, coincidence and dilution, and suitability verification with manufacturers.
Evaluation & reporting
- Conversion to reference conditions (20 °C, 100 kPa, zero water vapour pressure).
- Uncertainty assessment and recommended content for a test report.
Limitations
- Does not separate liquid vs solid fractions (use ISO 8573‑2, ISO 8573‑7 for specific fractions).
- Mass‑based particle concentration is outside this part (ISO 8573‑8).

Applications

ISO 8573-4:2019 is used by professionals who need to quantify airborne particulates in compressed air systems for quality, safety and process control:

Compressor and compressed‑air treatment manufacturers
Industrial maintenance and reliability engineers
Cleanroom and pharmaceutical quality managers
Food & beverage, electronics and semiconductor production teams
Test laboratories performing compressed air purity assessments Practical uses include compliance testing to ISO 8573‑1 particle purity classes, selecting filtration/dryer systems, validating compressed air for critical processes, and generating traceable test reports.

Related Standards (if applicable)

ISO 8573‑1 - Contaminants and purity classes (overall classification)
ISO 8573‑2 - Oil content by mass
ISO 8573‑7 - Viable microbiological particles
ISO 8573‑8 - Particle concentration by mass
ISO 21501‑1 / ISO 21501‑4 - OPC / OAS instrument methods
ISO 3857‑4, ISO 80000‑1 - Terminology and units

Keywords: ISO 8573-4:2019, compressed air, particle content, particle concentration, particle size, sampling, optical particle counter, purity classes.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics

Scope & purpose
- Sampling procedures and guidance for choosing measuring instruments.
- Reporting particle size and number concentration for compressed air.
Measurement methods
- Sampling-disc microscopy (light optical microscopy) - practical for particles ≥ 5.0 µm.
- Scanning electron microscopy (SEM) - capable down to ≈ 0.005 µm.
- Optical particle counters / optical aerosol spectrometers (OPC / OAS) - typical range ~0.06 µm to ≤100 µm.
Sampling techniques
- Full‑flow and partial‑flow sampling; guidance on isokinetic sampling and diffusers (see informative annexes).
- Considerations for sampling duration, flow measurement, and avoiding contamination.
Instrument considerations
- Instrument selection, calibration, coincidence and dilution, and suitability verification with manufacturers.
Evaluation & reporting
- Conversion to reference conditions (20 °C, 100 kPa, zero water vapour pressure).
- Uncertainty assessment and recommended content for a test report.
Limitations
- Does not separate liquid vs solid fractions (use ISO 8573‑2, ISO 8573‑7 for specific fractions).
- Mass‑based particle concentration is outside this part (ISO 8573‑8).

Applications

ISO 8573-4:2019 is used by professionals who need to quantify airborne particulates in compressed air systems for quality, safety and process control:

Compressor and compressed‑air treatment manufacturers
Industrial maintenance and reliability engineers
Cleanroom and pharmaceutical quality managers
Food & beverage, electronics and semiconductor production teams
Test laboratories performing compressed air purity assessments Practical uses include compliance testing to ISO 8573‑1 particle purity classes, selecting filtration/dryer systems, validating compressed air for critical processes, and generating traceable test reports.

Related Standards (if applicable)

ISO 8573‑1 - Contaminants and purity classes (overall classification)
ISO 8573‑2 - Oil content by mass
ISO 8573‑7 - Viable microbiological particles
ISO 8573‑8 - Particle concentration by mass
ISO 21501‑1 / ISO 21501‑4 - OPC / OAS instrument methods
ISO 3857‑4, ISO 80000‑1 - Terminology and units

Keywords: ISO 8573-4:2019, compressed air, particle content, particle concentration, particle size, sampling, optical particle counter, purity classes.

ISO 8573-4:2019 PDF

Technical details

Abstract

Overview

Key Topics

Applications

Related Standards (if applicable)

Related standards

Abstract

Overview

Key Topics

Applications

Related Standards (if applicable)

Related standards

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Compressed air — Part 2: Test methods for oil aerosol content

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