TECHNICAL REFERENCE
Donaldson hydraulic filter media beta ratings are average ratings obtained from multi-pass tests performed per the new ISO 16889 standard. According to the ISO standard, each filter manufacturer can test a given filter at a variety of flow rates and terminal pressure drop ratings that fit the application, system configuration and filter size. Your actual performance may vary depending on the configuration of the filter tested and test conditions. Donaldson Hydraulic Filter Media Beta Ratings NEW Donaldson Filter Media Efficiency Ratings per ISO 16889 Test Standards Media No Former Rating Efficiency Rating Beta x m = 2/75 per ISO 4572 Beta x m(c) = 200/1000 per ISO 16889 Donaldson Synteq ® XP Synthetic Media XP05 5/7 XP10 9/11 Donaldson Synteq ® Synthetic Media # 7 7/22 25/33 # 20 20/40 42/>50 /00 <2/3 5/6 /03 7/22 18/23 Donaldson Cellulose Media # 10 10/25 19/23 /1 10/30 32/36 /3 25/45 46/>50
Highlights of ISO 16889 • ISO 4572 is now replaced by ISO 16889
as the international standard for Multi-Pass Tests to determine the efficiency (beta rating or beta ratio) and the dirt-holding capacity of the filter. • The test bench for ISO 16889 must have On-Line Liquid Automatic Optical Particle Counters (APC) calibrated using NIST (National Institute of Standards & Technology)-certified calibration fluid. This includes added enhancements to APC’s, to allow for better resolution, accuracy, repeatability and reproducibility. • ISO 12103-1,A3 (ISO Medium, 5 m-80 m) • Test Dust was selected as replacement dust for calibration and testing procedures. • APC’s are calibrated by passing a sample of calibration fluid with a known particle size distribution and producing a calibration curve to match the known count distribution. • NIST used the Scanning Electron Microscope analysis and statistical analysis techniques to certify the particle size distribution. • Particle counts, upstream and downstream, are taken every minute of the test. • Beta ratios are reported with (c) to designate NIST traceability. ISO 16889 recommends reporting beta ratings at: Rating Efficiency 2 50% 10 90% 75 98.7% 100 99% 200 99.5% 1000 99.9% Example: ß4(c) =200 signifies that there are 200 times as many particles that are 4 m and larger upstream as downstream. This is 99.5% efficiency. Example: ß5(c) =1000 indicates that there are 1000 times as many particles that are 5 m and larger upstream as downstream. This is 99.9% efficiency.
32 • Hydraulic Filters & Accessories
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