The Optimarin Ballast Water Treatment Systems can be delivered for installation in areas with potentially explosive atmosphere, Ex zone 1 . The Optimarin BWTS Ex is built with individually certified quality components resulting in Ex marking :II 2G Ex d e  ia ib mb px IIB/IIC T4, depending options selected. Control- and power panels are installed in safe area; while UV chambers, valves, filter, pump and instrumentation are approved for installation in hazardous area.

The UV-chamber Ex protection is a certified Exp solution. The internal parts of the UV-chambers, excluding the flow path of ballast water, is purged and pressurized with nitrogen. The nitrogen overpressure prevents hazardous atmosphere contact with the UV-lamp and allow effective UV treatment of the ballast water.