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Aquarius UVX, the Atex-proof Ultra Violet BWTS

The Aquarius UVX system is a fully automatic ballast water treatment system, designed and tested for installation and operation in a Zone 1 IIC T4 environment. It holds an ATEX Type approval and the design has been verified by DEKRA Test and Certification (Notified Body 0158).

Typically used on tankers and other vessels that require their ballast water treatment system to be installed in a Zone 1 or Zone 2 area, the Aquarius UVX uses a combination of hazardous area solutions. The system is independently approved to both ATEX and IECEx standards and can be installed in Zone 1 hazardous areas on both US and non-US flagged vessels.

From an operator point of view, it performs in exactly the same way as our standard area UV BWMS with some added safety features.

Atex logo, hazardous Zone 1 IIC T4designed for operation and installation in a hazardous Zone 1 IIC T4 environment
  IECex logo Wartsila Water and Wasteapproved to IEC Ex standards; for installation in Zone 1 hazardous areas (US &  non-US flagged vessels)



    • Supplied with plug & play intrinsically safe barrier box that enables all required signals from the hazardous area to be connected on installation (on the safe area bulkhead).
    • Installer only needs to consider the cable runs, as all IS circuits are supplied with suitable barrier protection.
    • Local junction boxes provided for installation in hazardous area, fully rated & certified.
    • System uses pneumatic actuators and a purge & over-pressure protection system for the UV chamber (using ship's air)
    • Thanks to modular design, only the filter and UV reactor need to be installed in the hazardous area. Power & control panels are installed in a safe area on the vessel. (connected via electrical & control related cabling)


    System Capacity (m3/h) Total installed power (kW)
    AQ-125-UVX 12.5 / 125 19.0
    AQ-300-UVX 30 - 300 47.7
    AQ-500-UVX 50 - 500 62.6
    AQ-750-UVX 75 - 750 92.2
    AQ-1000-UVX 100 - 1000 100.0

    The treatment capacity, process capability and performance of the Aquarius® UVX systems are exactly the same as those on the standard area Aquarius® UV systems.


    DEKRA ATEX certificate

    > View certificate

    IMO Revised G8

    > View type approval

    Bureau Veritas

    > View type approval

    Lloyd's Register

    > View type approval

    IMO Greek Flag Revised G8

    > View type approval

    Korean Register

    > View type approval


    Delivered as standard

    • FilterSafe® filter fitted with EX d/e motors & instrumentation where required
    • Pneumatic actuators instead of electric ones
    • Ex e/i instrumentation on the UV chamber kit, including the flow meter
    • UV reactor with Ex p (purged and overpressure) system on the UV chamber
    • Sample point
    • Power distribution cabinet
    • Control cabinet
    • Remote control console
    • Additional sample points

    Find the best BWMS for your vessel

    BWMS Calculator

    1. Ballast Water Pump Capasity Needed m3h

      Value: m3h
    2. System preference:

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    3. Number of pumps that require treatment:

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    4. Number of systems required given the vessel's configuration:

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    5. Hazardous Installation:

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