IECEx, ATEX & UL certified purge and pressurization systems for Zone 1, Class I Div 1 applications

  • Global approvals
  • Purge flow capacity up to 900 Nl/min
  • Leakage Compensation or Continuous Flow
  • Stainless steel enclosure construction


Expo’s Minipurge type X range provides a full purge and pressurization solution for electrical enclosures and other equipment installed in Zone 1 or Class I Div 1 hazardous environments. With a range of flow capacities up to 900 Nl/min, the systems are suitable for large enclosures up to 5.4m³ volume. Expo also supply customised purge systems to suit higher flow rates. X purges are automatically operated, with an integral timer to ensure that the purge is carried out for the specified time.

Two configurations are available – Leakage Compensation (LC) and Continuous Flow (CF).

The system comprises:

  • Control Unit (CU) – The CU contains the pneumatic logic to monitor and control air flow, pressure and purge timing, and provides the system outputs.
  • Relief Valve (RLV) – For systems with the LC configuration, the RLV measures purge flow at the outlet and provides over-pressure protection for the enclosure. For CF systems, the RLV provides over-pressure protection only
  • Spark Arrestor Unit (SAU) – For CF systems only, the SAU provides an outlet for the continuous flow of purge gas and provides flow measurement.


Air Inlet Instrument quality air, 4-8 barg
Purge flow rate
  • Size 1 – up to 225 NI/min
  • Size 2 – up to 450 NI/min
  • Size 3 – up to 900 Nl/min
Temperature range -20°C to +55°C
Purge mode Leakage compensation (LC) or Continuous Flow (CF) options
Purge timer 1-99 minutes
Timer power source IS (Intrinsically Safe) Battery
Signal Outputs
  • Power interlock, low pressure alarm
  • Options: Ex e junction box IS outputs pneumatic outputs
Certifications IECEx, ATEX, INMETRO, KOSHA*, EAC, FM, cULus

* Not all certifications apply to all system variants. Check the specific Operating & Maintenance Manual for details.

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