Test of filter media according to EN 1822 - …

1 Test of filter media according to EN 1822. Thomas Krinke & Hans-Georg Horn TSI Particle Seminars 2008. 2007, TSI Incorporated Outline Filtration Basics EN 1822 Short Overview Solution for EN 1822 conform characterization of filter media 2. 2007, TSI Incorporated filter Testing Introduction Downstream Concentration Penetration, P =. Upstream Concentration Efficiency, E = 1 - P. Most Penetrating Particle Size, MPPS: Typically between and m Mechanical media : 100 nm < MPPS < 300 nm Electro-Static and Membrane: MPPS < 100 nm 2007, TSI Incorporated Filtration Mechanisms Action of Brownian motion. Best capture with small particles, fine Diffusion fibers and low velocities. Independent of particle density. Interception Particles travel along streamlines and are caught because of their size.

2 Ratio of particle to fiber size is important. Inertial Particles deviate from the streamlines due to inertia and impact on the fibers. Large particles, high density, high velocity and small fibers Impaction is most efficient. Electrostatic Particle is attracted to the fiber by electrical forces. Deposition Inertial Impaction Electrostatic Attraction (-). (+). filter Fiber Brownian Diffusion Interception 4. 2007, TSI Incorporated filter Efficiency Curve 100%. 80%. Efficiency 60% INTERCEPTION. DIFFUSION AND. INERTIAL. IMPACTION. 40% DIFFUSION. AND. INTERCEPTION. 20%. 0%. 1. Particle Diameter [ m]. 5. 2007, TSI Incorporated filter Penetration 100. Most Penetrating Particle Size (MPPS). 10. % Penetration Diffusion Inertial Impaction 1 and Diffusion Interception and Interception 1 10.

3 Particle Diameter ( m). 6. 2007, TSI Incorporated Penetration versus Particle Size Effect of Particle Deposition Mechanisms and Flow Rate (Face Velocity) MPPS. on Penetration and Diffusion Interception PENETRATION. Impaction Most Penetrating Particle Size MPPS. lower velocity Decrease of face velocity Leads to Increase of MPPS. PARTICLE SIZE - log scale Decrease of Penetration 7. 2007, TSI Incorporated filter Testing Standard EN 1822. EN 1822 is the European test standard for HEPA & ULPA. filters Certifies a filter 's absolute minimum efficiency for all particles. Primarily used to certify air filters for clean room applications. The two-part EN 1822 test identifies the MPPS and challenges the filter with only these particles, creating an absolutely worst-case scenario (Schroth and Caesar 2001).

4 8. 2007, TSI Incorporated filter Testing Standard EN 1822. European Standard EN 1822 5 parts 1822-1 Classification, performance testing, marking 1822-2 Aerosol production, measuring equipment, particle counting statistics 1822-3 Testing flat sheet filter media (Standard for 3160). 1822-4 Determining leakage of filter element (Scan method, TSI components can be used). 1822-5 Determining the efficiency of filter element (TSI components can be used). 9. 2007, TSI Incorporated Classification by En 1822 1. HEPA & ULPA Filters High Efficiency Particle Air filter Ultra Low Penetration Air filter 10. 2007, TSI Incorporated Example for Decrease of Number Concentration +07. Particle/ccm on raw gas side Concentration on Clean Gas Side [#/ccm]. +06. Particle/ccm on raw gas side +05.

5 +04. +03. +02. +01. +00. H10 H11 H12 H13 H14 U15 U16 U17. filter Type 11. 2007, TSI Incorporated filter Testing Standard EN 1822. The test has two steps: 1. Determine the MPPS of the filter medium considering the mean face velocity of the medium when pleated into the filter (EN 1822 part 3). 2. Test the filter element at its MPPS by filter scanning (EN 1822 part 4) for leak detection and integral (overall) filter efficiency measurement. For complex filter geometries where scanning is not appropriate, filter elements may be tested in a closed test duct (EN 1822 part 5). In this case, only the integral efficiency is measured. 12. 2007, TSI Incorporated 1822-3 Testing flat sheet filter media filter manufacturers expect that media manufacturers supply a test certificate with the MPPS.

6 Many filter customers expect 100% testing of product by the filter manufacturer. 13. 2007, TSI Incorporated 1822-3 Testing flat sheet filter media EN 1822 allows two approaches: test aerosol and CPC(s). test aerosol and OPC. 14. 2007, TSI Incorporated 1822-3 Testing flat sheet filter media With monodisperse test aerosol and CPC(s). 15. 2007, TSI Incorporated 50 nm Atomizer with DEHS in Isopropanol Neutralizer 3012. 3080L with Neutralizer 3077, 5L/min Sheath Air 16. 2007, TSI Incorporated 100 nm Atomizer with DEHS in Isopropanol Neutralizer 3012. 3080L with Neutralizer 3077, 5L/min Sheath Air 17. 2007, TSI Incorporated 150 nm Atomizer with DEHS in Isopropanol Neutralizer 3012. 3080L with Neutralizer 3077, 5L/min Sheath Air 18. 2007, TSI Incorporated Creating Penetration Curve with Monodisperse Aerosol Penetration dn/dlogdp Particle Diameter Penetration logdp Particle Diameter 19.

7 2007, TSI Incorporated 1822-3 Testing flat sheet filter media With polydisperse test aerosol and OPC. 20. 2007, TSI Incorporated Disadvantages of OPCs for Determination of MMPS. Comparatively poor size resolution (high resolution needed). No channels below 200 nm Some filter media ( electrostatic) can have MMPS of below 50nm 21. 2007, TSI Incorporated Monodisperse test aerosol and CPC(s). for determination of MPPS. Biggest advantage: Excellent coverage of the possible size range for the MPPS. Disadvantage: More time needed to carry out test 22. 2007, TSI Incorporated Instrument Solution Model 3160 Fractional Efficiency filter Tester Fully automated test solution, ideally suited for filter media development (R&D). Can be used for a wide variety of media , including very high efficiency media Up to efficient Fully automated to save test time Components are industry standards Classifier with DMA.

8 CPC detection Does NOT provide information about loading behavior For filter media tests (EN1822 part 3), TSI model 3160 is fully compliant 23. 2007, TSI Incorporated Model 3160 Flow Schematic Quick Test System Salt Atomizers Electrostatic Classifier Dilution filter filter Pump Bridge Drier Diluter Neutralizer Upstream CPC. Mixing filter Clean Air Manifold Supply filter filter Holder Oil Atomizers Rotometer P filter Pump Bleed Flow System Downstream CPC. Computer filter Flowmeter Pump 24. 2007, TSI Incorporated Instrument Solution (2). Provides key information about filter media performance, including: Fractional filter efficiency Determine most penetrating particle size (MPPS). Full featured graphical and tabular outputs 25. 2007, TSI Incorporated 3160 Printouts 26.

9 2007, TSI Incorporated Applications filter media development and characterization Relevant for any company manufacturing high efficiency filter media Many new particle air filters are being developed New types of filter media is being developed to build new filters It's important to know the characteristics of the media 27. 2007, TSI Incorporated 3160 Operation and Setup Tips If downstream counts are <100 for some particle sizes consider lengthening sample time Monitor concentration periodically to detect problems with atomizers If penetration goes up again after (larger sizes). passing MPPS this is an indication of a downstream leak Salt and Oil give the same results (test it if you like). Use oil to minimize maintenance 28. 2007, TSI Incorporated 3160 Calibration Instrument uses electrical mobility which is the standard method for checking submicron particle sizes and CPC's which are the concentration standard Flows and pressure drops can be independently verified Field Installation is provided with new instruments to verify performance We provide Field Service and Service Contracts when requested by customers 29.

10 2007, TSI Incorporated 3160 Features and Benefits Feature Benefit Automated Fractional Efficiency test Simpler and easier than developing this system from components Includes computer and Windows software Familiar Windows look and feel minimizes operation for current operating systems and training time Flows and size controls are automatic or Doesn't require additional equipment or lots of time simple to use to set up tests New expanded size range up to Provides information that previously required a microns different tester Fast Test Mode Adds ability to use an instrument designed for fractional efficiency for fast quality control tests Automatically adjusts concentration and Eliminates the need to monitor the test for test time to get the best results