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ULPA Filtration Applications

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    Low level measurement of VOCs and Terpenes close to the sea and the Landes Forest

    It has been established that organic aerosol (OA) makes up for a major fraction of fine particulate matter in all region of the atmosphere. This fraction accounts approximately for half of the total PM2.5 dry mass.1,2 Primary OA is directly emitted in the troposphere from anthropological and natural sources whereas secondary OA (SOA) is formed in-situ in the atmosphere from the oxidation of biogenic or anthropogenic gas-phase precursors and subsequent partitioning of the less volatile products into the particle phase. The current number is that, on a global scale, SOA would represent around 60% of the overall OA.3 However, recent global mass-balance estimations for the removal of volatile organic compounds (VOC) suggest that this number could under-predicts SOA production.4 Recent field measurements in urban locations are also in support of a larger share, indicating that SOA is the dominant fraction of OA, with amounts considerably 20 greater than models predictions.

    By Chromatotec Group based in Val de Virvée, FRANCE.

  • Smoke generator device for clean room solutions

    The correct functioning of HEPA filters is normally tested at the time of installation, as well as part of the routine maintenance programme. It is normally recommended that HEPA filters are checked at 14 month intervals or less, or immediately after filter changing. Where high efficiency filters are fitted, it is vital that the filter housing/sealing device does not allow particulate material to pass and thereby compromise the clean room environment that is being served. Testing is necessary since HEPA filters can become partially or totally blocked, rendering the filter of little value.

    By Concept Smoke Systems based in Maidenhead, UNITED KINGDOM.

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    Aerosol and particle technology for filter testing industry

    Nearly 100 test rigs for the quality assurance and the development of filters are being used worldwide with great success.

    By Palas GmbH based in Karlsruhe, GERMANY.

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