---

General information of protection type pressurized Ex p      

In modern chemical plants increase the need of complex electrical equipment used in the processing area of flammable materials. An explosion protection of electrical equipment will be ever higher requirements. The ignition pressure encapsulation Ex p offers a variety of applications.

The overpressure encapsulation (ex-p) makes it possible to use not explosion-proof equipment in hazardous areas. The overpressure encapsulation is the idea, to keep away explosive gas from the non-ex-devices.






                        

                           

    For all Non Ex devices and controlsystems
^Top

Principal of pressurized systems (new approach, no flushing)

Principal of the pressurized system

The explosion protection by pressurized system is realized by using the non-explosion devices in a overpressurized housing (ex p -housing). This housing by a permanent pressure with air or inert gas keeps away a potential explosive atmosphere. Depending on the application and existing explosion protection zone, before using the devices or controlsystems the housing must be released by a das detection. This will ensure that there is no possiblyexplosible atmosphere in the housing at the start up.

                           Permanent pressure!

^ To Top

System build up of pressurisation system

Build up of pressurized systems

Modern pressure systems consist of an integrated control unit, with all electronic and pneumatic components such as controller, pressure sensors, etc. All components can be mounted inside the Ex p housing (also our patented main contactor can installed without a flameproof expensive housing). The operating mode is "compensate for the leakage losses", in which after the release only so much air or inert gas flows into the housing, that a minimum pressure is maintained. This approach is time saving and saving the expensive pressured air for only flushing. Most applications are based on the "compensate for the leakage losses."

                       Always the safe side

^ To Top

Compensate of leakage losses and protection types of pressurisation systems 

In this mode, after release by a stationary or mobile gas detector a mbar pressure will be maintained within the ex p housing. On the gas entrance digital vales and proportional flushing valves can be used



The overpressurized protection is divided into three protection types, broken down as follows distinguished:


   


    * Typ "px": The zone classification within the housing will decrease from Zone 1 to Non explosive
    * Typ "py": The zone classification within the housing will decrease from Zone 1 to Zone 2
    * Typ "pz": The zone classification within the housing will decrease from Zone 2 to Non explosive.

 

                The right system for your application!