Merging safe protection for non-Ex equipment with the option of fast commissioning and easy modification is the benefit of combining explosion protection types Ex d and Ex e.
A wide range of sturdy flameproof enclosures is available to protect equipment from explosion or environmental hazards while the operator elements and terminals for signal and power connection are easily accessible in Ex e enclosures.
Each ‘bushed’ solution is customized exactly to meet the requirements of the specific application. In order to design the optimal solution, experienced project engineers in Pepperl+Fuchs' Solution Engineering Centers are in close contact with the customer for the duration of the project. Each solution is shipped to the location of operation with full certification and documentation. Commissioning will be fast and easy as there is no need to open the Ex d enclosure on site.
Ex de solutions consist of a combination of a pressure-resistant housing (flameproof Ex d) on top and an increased safety Ex e housing underneath, which includes terminals and control elements in customized installations. The housings are securely connected via a special cable duct. A flange between the housings prevents dirt buildup and moisture penetration.
Components for measuring and control technology, or electrical installation technology, that are not specifically designed for hazardous areas can be installed in the flameproof Ex d housing. In addition to isolated barriers from Pepperl+Fuchs, these components may include DCS and ESD systems or other instruments made to user specifications. The pressure-resistant housing ensures that the non-Ex devices do not pose a threat to the environment. Under ideal conditions, the flameproof Ex d housing is opened as little as possible after initial installation, as special rules under IEC 60079-14 must be observed during opening and closing. The increased safety Ex e housing contains only Ex certified components. This makes it much easier and safer to access than the Ex d housing. Terminals and control and monitoring elements can be serviced or replaced at any time, subject to compliance with the relevant provisions.
In this way, customers can reap the benefits offered by both types of protection: the increased safety Ex e housings allow for easy extension and modification of the control elements that they contain. The controllers in the Ex d housing are ready for use and allow rapid commissioning with little system downtime and reduced maintenance work.
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