Siemens SIPROCESS GA700 Compact Operating Instructions page 24

Safety notes
2.5 Use in hazardous areas
Dust in pressurized enclosure "Type of protection Ex p"
An explosive dust atmosphere inside an enclosure can result in an explosion.
• Ensure that the interior of the device is dust free.
• In Zones 21 and 22: Remove the dust layers manually from the enclosure.
• Cleaning by pre-purging is not permitted.
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WARNING
SIPROCESS GA700 rack and wall mounted devices
Compact Operating Instructions, 06/2023, A5E35134047-AB