• European Union (ATEX)
  • IECEx
  • North America (CSA, FM, UL)


  • Gas - IIC
  • Dust - IIIC
  • US Gas - (Class I)
  • US Dust - (Class II)


  • Gas Area - Zone 1
  • Dust Area - Zone 21
  • US Gas Area - Div 1
  • US Dust Area - Div 1


  • Gas Temp. - T6 (85C)
  • Dust Temp. - T85C
  • US Gas Temp. - T6 (85C)
  • Lower Ambient Temp - -20C
  • Higher Ambient Temp - Greater than +40C


  • Gas Concept - Ex p /px /py / pz
  • Dust Concept - Ex p / pD
  • US Gas Concept - AEx /Ex px / py / pz
  • US Dust Concept - AEx pD (PX/PY/PZ)


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Supplier Details

  • Address:

    Unit 2 The Summit, Sunbury-on-Thames, Middlesex TW16 5DB United Kingdom

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Expo Technologies Purge & Pressurized Motor Systems

Purge Systems » Purge Systems

Expo’s motor purge and pressurization control units enable you to install electric motors in gas and dust hazardous areas. By employing Expo’s motor purge and pressurization control units your motor will meet ATEX or IECEx requirements for Zone 1 ,  Zone 2 and Zone 21 ,  Zone 22 and/or NPFA requirements for Class I,  Class II,  Division 1 and Division 2.

Purge & Pressurization is an easy, low-cost protection for large electric motors in hazardous areas.

Eliminate spurious motor trips and associated restart delays. Expo developed CLAPS – Closed Loop Automatic Pressurization System. It:

  • Prevents internal air-pressure drops due to sudden load or operating temperature changes. Without CLAPS, the motor trips due to low internal air-pressure;
  • Maintains enclosure’s air pressure because it is a fast, high-gain, high-capacity regulator;
  • Injects high air volumes, restoring the enclosure’s air pressure.

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