ISO 4548-12:2017
Methods of test for full-flow lubricating oil filters for internal combustion engines — Part 12: Filtration efficiency using particle counting and contaminant retention capacity
ISO 4548-12:2017 specifies a multi-pass filtration test with continuous contaminant injection and using the online particle counting method for evaluating the performance of full-flow lubricating oil filters for internal combustion engines. The scope of this document is limited to steady state conditions and does not address fluctuations in the flow rate.
The test procedure determines the contaminant capacity of a filter, its particulate removal characteristics and differential pressure.
This test is intended for application to filter elements with an efficiency of less than 99 % at particle size greater than 10 μm.
NOTE Several test flow loops built into one test rig, or several test rigs, would be necessary to cover the complete flow range of 2 l/min to 600 l/min.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Test equipment and materials
5.1 Test equipment
5.1.1 Test rig
5.1.2 Online dilution and particle counting system
5.1.3 Timer
5.2 Test materials
5.2.1 Test contaminant
5.2.2 Test fluid
6 Accuracy of measuring instruments and test conditions
7 Test rig validation
7.1 Validation of filter test circuit
7.2 Validation of contaminant injection circuit
7.3 Validation of online dilution and particle counting system
8 Preliminary preparation
8.1 Test filter assembly
8.2 Contaminant injection circuit
8.3 Filter test circuit
9 Test procedure
9.1 Initial measurement
9.2 Performance test
10 Calculations and report of test results
10.1 Calculations
10.1.1 General
10.1.2 Gravimetric levels
10.1.3 Filtration efficiencies
10.1.4 Micrometer ratings
10.1.5 Injected mass of contaminant
10.1.6 Non-retained mass of contaminant
10.1.7 Retained filter capacity
10.2 Test report
Annex A (normative) Specification of test fluid for oil filter test
Annex B (informative) Typical filter test report
Annex C (normative) Filter efficiency calculations
Annex D (informative) Round robin exercise
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Test equipment and materials
5.1 Test equipment
5.1.1 Test rig
5.1.2 Online dilution and particle counting system
5.1.3 Timer
5.2 Test materials
5.2.1 Test contaminant
5.2.2 Test fluid
6 Accuracy of measuring instruments and test conditions
7 Test rig validation
7.1 Validation of filter test circuit
7.2 Validation of contaminant injection circuit
7.3 Validation of online dilution and particle counting system
8 Preliminary preparation
8.1 Test filter assembly
8.2 Contaminant injection circuit
8.3 Filter test circuit
9 Test procedure
9.1 Initial measurement
9.2 Performance test
10 Calculations and report of test results
10.1 Calculations
10.1.1 General
10.1.2 Gravimetric levels
10.1.3 Filtration efficiencies
10.1.4 Micrometer ratings
10.1.5 Injected mass of contaminant
10.1.6 Non-retained mass of contaminant
10.1.7 Retained filter capacity
10.2 Test report
Annex A (normative) Specification of test fluid for oil filter test
Annex B (informative) Typical filter test report
Annex C (normative) Filter efficiency calculations
Annex D (informative) Round robin exercise
Bibliography