ISO 8573-2:2018
Compressed air — Contaminant measurement — Part 2: Oil aerosol content
ISO 8573-2:2018 specifies test methods for the sampling and quantitative analysis of liquid oil and oil aerosols that can typically be present in compressed air. Test methods for oil vapour are excluded from this document as they are covered by ISO 8573‑5.
Two different methods are described, Method A and Method B. Method B is subdivided into two parts to clearly distinguish between procedures for obtaining the quantity of oil for analysis.
Method A describes an oil collection technique using inline coalescing filters whereas Method B utilizes sampling discs in a holder from which the collected oil is extracted with a solvent and analysed by infrared spectrometry or gas chromatography with flame ionization detection.
ISO 8573-2:2018 also includes descriptions of alternative oil aerosol detection by the use of indicator type devices, see Annex E.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Units
5 Reference conditions
6 Guidance for selection of sampling method
7 Method A — Description, measuring procedure and calculation of results
7.1 Description of sampling equipment and method
7.1.1 General
7.1.2 Sampling equipment
7.2 Sampling procedure
7.2.1 Start-up
7.2.2 Stabilizing sampling filter
7.2.3 Oil measurement
7.2.4 Oil/water measurements
7.2.5 Air flow-rate (discharge)
7.2.6 Temperature
7.3 Calculation of test results
7.3.1 General
7.3.2 Oil content
8 Method B — Description, measuring procedure and calculation of results
8.1 General description of sampling equipment and method
8.1.1 Sampling disc
8.1.2 Sampling disc support
8.1.3 Pipes and valves
8.1.4 Sampling disc holder
8.1.5 Construction materials
8.2 Sampling equipment arrangement
8.2.1 Sampling equipment Method B1 — Full flow sampling
8.2.2 Sampling equipment Method B2 — Partial flow sampling
8.2.3 Equipment set-up for isokinetic sampling
8.2.4 Compressed air flow-rates for isokinetic conditions
8.3 Equipment and sampling disc preparation
8.3.1 Equipment preparation
8.3.2 Oil vapour
8.3.3 Temperature
8.3.4 Handling
8.3.5 Sampling disc contamination check
8.4 Compressed air sampling procedure
8.4.1 Typical sampling Method B1
8.4.2 Typical sampling Method B2
9 Analytical procedure for Methods B1 and B2
9.1 General
9.2 Apparatus
9.2.1 Usual laboratory glassware
9.2.2 Infrared spectrometer (IR)
9.2.3 Gas chromatograph and flame ionization detector (GC-FID)
9.3 Analytical procedure linearity check
9.4 Analytical procedure — Oil recovery coefficient
9.5 Limit of detection
9.6 Calculation of test results
9.7 General
10 Presentation of results
11 Uncertainty of the method
Annex A (informative) Typical test report
Annex B (informative) Typical equipment layout and dimensional details
Annex C (informative) Example IR analysis and calculation of test results for Method B
Annex D (informative) Example GC FID analysis and calculation of test results for Method B
Annex E (informative) Alternative oil aerosol detection
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Units
5 Reference conditions
6 Guidance for selection of sampling method
7 Method A — Description, measuring procedure and calculation of results
7.1 Description of sampling equipment and method
7.1.1 General
7.1.2 Sampling equipment
7.2 Sampling procedure
7.2.1 Start-up
7.2.2 Stabilizing sampling filter
7.2.3 Oil measurement
7.2.4 Oil/water measurements
7.2.5 Air flow-rate (discharge)
7.2.6 Temperature
7.3 Calculation of test results
7.3.1 General
7.3.2 Oil content
8 Method B — Description, measuring procedure and calculation of results
8.1 General description of sampling equipment and method
8.1.1 Sampling disc
8.1.2 Sampling disc support
8.1.3 Pipes and valves
8.1.4 Sampling disc holder
8.1.5 Construction materials
8.2 Sampling equipment arrangement
8.2.1 Sampling equipment Method B1 — Full flow sampling
8.2.2 Sampling equipment Method B2 — Partial flow sampling
8.2.3 Equipment set-up for isokinetic sampling
8.2.4 Compressed air flow-rates for isokinetic conditions
8.3 Equipment and sampling disc preparation
8.3.1 Equipment preparation
8.3.2 Oil vapour
8.3.3 Temperature
8.3.4 Handling
8.3.5 Sampling disc contamination check
8.4 Compressed air sampling procedure
8.4.1 Typical sampling Method B1
8.4.2 Typical sampling Method B2
9 Analytical procedure for Methods B1 and B2
9.1 General
9.2 Apparatus
9.2.1 Usual laboratory glassware
9.2.2 Infrared spectrometer (IR)
9.2.3 Gas chromatograph and flame ionization detector (GC-FID)
9.3 Analytical procedure linearity check
9.4 Analytical procedure — Oil recovery coefficient
9.5 Limit of detection
9.6 Calculation of test results
9.7 General
10 Presentation of results
11 Uncertainty of the method
Annex A (informative) Typical test report
Annex B (informative) Typical equipment layout and dimensional details
Annex C (informative) Example IR analysis and calculation of test results for Method B
Annex D (informative) Example GC FID analysis and calculation of test results for Method B
Annex E (informative) Alternative oil aerosol detection
Bibliography