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Z Purge: Inert gas or compressed air purge

Install any equipment in a Class I Div 2  Gp A-D,  Zone 2 IIC  Ex [pz] and Zone 22  Ex [pD] hazardous area. Z Purge units:

  • Feed a continuous flow of compressed air or inert gas through the enclosure to purge hazardous gases;
  • Monitor the compressed air or inert gas outflow, not the inflow, to ensure hazardous gases are indeed purged from the enclosure, then,
  • Maintain a positive pressure to prevent hazardous gas entering the enclosure.

There are two types of Z Purge:

  • Continuous Flow (CF): operates by:
    • A continuous flow of inert gas or compressed air purges hazardous gases from the enclosure, then,
    • Without changing the inflow air pressure, maintains a positive pressure to prevent hazardous gas creeping into the enclosure.
  • Leakage Compensation (LC) improves equipment uptime, and reduces running costs. It operates by:
    • Initially providing high air or inert gas volumes to rapidly purge hazardous gas from the enclosure;
    • Then providing low air or inert gas volumes,  sufficient to maintain a higher pressure inside the enclosure than the surrounding hazardous area, and to compensate for leaks from the enclosure.

There are two mounting options

  • Panel Mount (PM) Fits directly onto the enclosure requiring minimal external space.
  • Back Plate Mounting (BP): Mounts either directly onto the outside or remote from the enclosure.

Z Purge units are:

  • Compact: Gain full use of enclosure's internal space;
  • Series Purging: Purge multiple enclosures with 1 unit. N.B application specific.
  • Certified: Fully compliant as direct purge flow measurement at Relief Valve exhaust, required by IEC/EN 60079-2, NFPA 496:
    • ATEX,
    • cFMus,
    • cULus,
    • IECEx,
    • INMETRO.

  • 1ZCF/BP/IS

    Z purge. Back Plate Mounting. Continuous flow inert gas or compressed air purge unit for Class I Div 2  Gp A-D,  Zone 2 IIC Ex (pz) hazardous areas.1ZCF/BP/IS
    Purge Type Z inert gas or air purge
    Area: Class I Div 2, Zone 2 Equipment Content: Unclassified
    Purging Action Continous Flow Same flow rate during and after purge
    Enclosure Size up to 17 cu ft up to 0.39m3
    Mounting Style Back plate Mounts externally on the enclosure wall. Minimal piping.
    Alarm Output Integral Switch – IS or NI Volt free, Dry contact
    read more
  • 1ZCF/PM/IS

    Z-purge type. Class 1 Div 2 Gp A-D, Zone 2 IIC Ex (pz). Inert gas or air purge unit. Panel Mount. Continuous flow purging. Integral switch. Control valve, Spark arrestor, Relief valve. 0.39 m3 enclosure1ZCF/PM/IS
    Purge Type Z inert gas or air purge
    Area: Class I Div 2, Zone 2 Equipment Content: Unclassified
    Purging Action Continous Flow Same flow rate during and after purge
    Enclosure Size up to 17 cu ft up to 0.39m3
    Mounting Style Panel Mount Mounts externally through the enclosure wall. Minimal piping.
    Alarm Output Integral Switch – IS or NI Volt free, Dry contact
    read more
  • 1ZLC/BP/IS

    Z Purge unit. Inert gas or air purge. For enclosures to 60 cu.ft, 1.35 cu.m, Leakage Compensation, Back Plate Mounting, Ex i Integral Signal hermetically sealed volt free dry contact for Unclassified equipment in Class 1 Div 2 hazardous location. 1ZLC/BP/IS
    Purge Type Z inert gas or air purge
    Area: Class I Div 2, Zone 2 Equipment Content: Unclassified
    Purging Action Leakage Compensation High flow rate during purge.
    Then compensation for leakage
    Enclosure Size up to 60 cu ft up to 1.35m3
    Mounting Style Back plate Mounts externally on the enclosure wall. Minimal piping.
    Alarm Output Integral Switch – IS or NI Volt free, Dry contact
    read more
  • 1ZLC/PM/IS

    Z-Purge unit. Inert gas or air purge.  For enclosures to 60 cu.ft, 1.35 cu.m, Leakage Compensation, Panel Mount, Ex i Integral Signal hermetically sealed volt free dry contact for Unclassified equipment in Class 1 Div 2 location.1ZLC/PM/IS
    Purge Type Z inert gas or air purge
    Area: Class I Div 2, Zone 2 Equipment Content: Unclassified
    Purging Action Leakage Compensation High flow rate during purge.
    Then compensation for leakage
    Enclosure Size up to 60 cu ft up to 1.35m3
    Mounting Style Panel Mount Mounts externally through enclosure wall. Minimal piping.
    Alarm Output Integral Switch – IS or NI Volt free, Dry contact
    read more