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Simplifying Complexity. Delivering Safety.
Simplifying Complexity.
Delivering Safety.

Hazardous Area Label Printers

Gas & Dust certified, packaged solutions for Zebra ZT 411 (4” ) and ZT 421 ( 6” ) industrial label printers


  • Hazardous area solution for industry standard label printing —systems for 4” and 6” label sizes available
  • Gas and dust certified using Expo’s proven Ex p capability
  • ATEX / IECEx Zone 1/21 and 2/22, North American Class I & II Div. 1 & 2
  • Power and signal safety interlocked for full code compliance
  • 316L stainless steel enclosure for industrial & ultra-clean environments

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  • Description
  • Specifications
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Printers for bar code and batch number labels are found in many manufacturing facilities. If the printer is to be located in a hazardous area, for instance within a pharmaceutical production line, then a certified solution is required to ensure safe operation.

Due to operational requirement & constraints, many of the possible Ex protection concepts are not suitable. Ex p (Purge & Pressurization) provides the most flexible and cost-effective solution.

Expo have worked with Zebra Technologies, a leading manufacturer of industrial label printers to develop a standard certified solution based around their popular ZT400 series, including both 4" and 6" print widths.

The printer is installed inside a robust stainless steel enclosure. The system is fitted with a purge system to control and monitor the purge & pressurisation process, and an isolation unit to provide power and ethernet control. 

While the overall system is standard, the internal mounting arrangements are adaptable to house either Zebra printer model.

Expo’s design incorporates several unique features that make the system simple to use:

· Through-the-enclosure-wall pushbuttons to actuate the printer membrane switches for label feed control

· A clear window to view the printer display screen

· A low leakage, anti-static label slot to permit label exit while maintaining positive pressure inside the enclosure.

The printer sits on an adjustable, sliding internal tray allowing accurate alignment for the label feed and pushbuttons. A side access door is provided for print media roll change.

The system is suitable for table top mounting.


Print method
Thermal transfer or direct thermal
Print resolution
Std: 203 dpi
Other resolutions optional
Print widths
ZT411: Up to 4”
ZT421: Up to 6.6”
Power supply
100-230 VAC, 50-60 Hz.
Enclosure dimensions (mm)
570H x 560W x 650D (Excl. purge system)
Material of construction
316L stainless steel, 2.0 mm thickness
Purge & pressurization system
Expo SmartPurge II or MiniPurge with interface unit for power & signal isolation (MiniPurge for Class/Div applications)
Instrument air @ 2-7 bar
Maximum operating ambient temperature
ATEX / IECEx zones 1/21 & 2/22
North American Class I & II Div. 1 & 2