A nominal rating captures roughly 50–90% of particles at the stated size — and varies between manufacturers. An absolute rating means 99.5%+ capture efficiency, verified by ISO 16889 multi-pass testing of the media. This filter is 10 Micron; B9.9 = 200, B12.4 = 1000 per ISO 16889.
Yes — independently verified. SONA's 10 Micron; B9.9 = 200, B12.4 = 1000 per ISO 16889 microglass media is tested to ISO 16889 with a Beta ratio of BX = 200, matching or exceeding performance in both efficiency and dirt-holding capacity.
Change the Parker 931411 element when differential pressure reaches 25 PSID, or at your OEM service interval — typically every 500–2,000 operating hours depending on system load and contamination levels. Do not wait until the bypass valve activates.
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