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Data sheet: Pressurized Enclosures Zone 2

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Data sheet: Pressurized Enclosures Zone 2

Pressurized Enclosures Zone 2 Certification Overview

Expo holds IECEx & ATEX Category 3 Certificates to IEC I EN 60079-0 & 60079-2, Zone 2, Ex pz for populated Expo Purge & Pressurized Enclosures type PE3. The Certificate includes for installation of the client’s instrumentation and I or electrical apparatus when it complies with the Expo “Schedule of Limitations” .

For applications where there is a potential for hazardous dust as well as gas, certification can include for Zone 2 & Zone 22. The Zone 22 certification is to EN 61241-4 standard Ex p. Industries include: Pharmaceutical, Food, Plastic etc .


  • No need for   a Certified I   Notified   Body as the Certificate has been issued to Expo
  • Accept   orders   for   your   apparatus   in   hazardous location and increase your market share
  • Ease of Certification for the OEM and the User
  • Reduced Certification cost
  • Reduced time to market
  • After review, equipment not complying with the Sol may still be certified with a variation to the Expo Certificate

Contents of the Enclosure

The construction and power dissipation of the internal components are critical to ensuring effective purging,

compliance with Temperature Rating and Safe Operation.

Therefore all internal components and details of the PE must be reviewed by Expo Technologies to determine compliance with the IECEx I ATEX “Schedule of Limitations” (Sol) required for the certificate to apply. Thereafter, the final installation is to be verified by Expo.

Please ask Expo for a copy of the “PE3, Zone 2 Schedule of Limitations”.
Certification of the PE3 Enclosure


Certificate of Conformity IECEx ITS 11.0042X


Certificate of Conformity ITS 11 ATEX17381X

Ex pz llC T4 Ge [Zone 2]

Exp lllC T135°C De [Zone 22]

Ambient Temp

-20°C , -4°F to 55°C, 131°F

Pressure & Leakage Test

Test results with each PE3 To IEC I EN 60079-2

Over Pressure Test

18 mbarg (T’WC) to IEC I EN 60079-2

Purge Time

5 Volume Changes

Purge Test

Alternatively a Purge Test can be completed to prove effective purging and reduce the Purge Time

Compliance to General Conditions IEC I EN 60079-2

Includes thermal conditioning of Non metallic items, seals, etc resistance to light testing , impact testing 4 -7 Joules

Schedule of Limitations

Request Sol PE3, Zone 2 (22)

Instruments & electrical

Most apparatus installed within the PE3 are normally acceptable

Ex Apparatus

Permitted subject to internal temp

Effective Purging

Boxed apparatus will require ventilation holes

Power & Signals

Must be capable of being manually disconnected

Temperature Class

T4, T3, T2 dependent on internal and external apparatus


Check with Expo. Small memory type batteries may be able to be installed


Can be completed at the client’s or Expo premises. Expo will supply the verification document and certificate label(s)


See also MiniPurge Type Z systems Data Sheet or go to www “Product Wizard”

Common specification

Model Number: PE3 – – – –

PE3 Options:

  • Sizes – Purpose built and designed for the application
  • Maximum size 2.1m H x 1.8m W x 1.0m D
    Approx : 82″ H x 70″ W x 39″ D
    Larger sizes are available, please ask!
  • Material – 1.5mm to 3mm dependent on the size of the PE
    316L Stainless Steel – Finish: NROB
    Mild (Carbon) Steel – Finish: Powder Coated
    RAL7035 (Light Grey)
  • Doors – Front, Back, Side , Top , Bottom or Double doors
  • Door fasteners ­– Tool Operated 1/4 turn Stainless Steel (does not require a power disconnect door switch)
  • Hinges – Stainless Steel
  • Seals – Elastomer seals fully complaint with IEC I EN 60079-0
  • Windows – Polycarbonate Weather Strip or Clamped Laminated Glass Weather Strip or Clamped Maximum size up to 1m2 (Approx : 10.76ft2)
  • Control Devices & Actuators – Lamps, Push Buttons, etc Certified
  • Sub-panel (Chassis) – Rear, Slides, Top, Bottom or door
  • 19″ Rack – Fixed or Swing Frame
  • Mounting Bosses
  • Lifting Eye’s
  • Gland Plates
  • Mobile PE3 – Anti-Static Wheels
  • Wall Lugs
  • Free Standing
  • Plinths
  • Keyboards etc

If you have an application for Hazardous Location, IECEx- ATEX – NEC please feel free to ASK!