NS EN 1822-4 : 2009
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
HIGH EFFICIENCY AIR FILTERS (EPA, HEPA AND ULPA) - PART 4: DETERMINING LEAKAGE OF FILTER ELEMENTS (SCAN METHOD)
01-01-2019
12-01-2013
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
3.1 sampling volume flow rate
3.2 sampling duration
3.3 total particle count method
3.4 particle counting and sizing method
3.5 particle flow rate
3.6 particle flow distribution
4 Description of the procedure
5 Test filter
6 Test apparatus
6.1 Set-up of the test apparatus
6.2 Test duct
6.3 Scanning assembly
6.4 Aerosol generation and measurement techniques
7 Test air
8 Test procedure
8.1 General
8.2 Preparatory checks
8.3 Starting up the aerosol generator
8.4 Preparing the test filter
8.5 Testing
9 Evaluation
9.1 Calculating the penetration and the efficiency
9.2 Local penetration
9.3 Mean efficiency
9.4 Classification
10 Test report
10.1 Details of the test filter
10.2 General details of the test parameters
10.3 Test results
11 Maintenance and inspection of the test apparatus
Annex A (normative) Oil thread test
Annex B (normative) Determining the test parameters
Annex C (informative) Example of an application with
evaluation
Bibliography
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