Siemens SIPROCESS GA700 Compact Operating Instructions page 186

Commissioning
6.2 Safety instructions for hazardous areas
Dust in pressurized enclosure "Type of protection Ex p"
Explosion hazard
The ignitable dust atmosphere inside the pressurized enclosure can lead to an explosion.
Before usage in dust atmospheres in Zones 21 and 22:
• Ensure that the interior of the device is completely dust-free.
• Remove the dust layers manually from the enclosure surface, for example by using a
PoE with rack-mounted devices for operation with type of protection Ex nA
Explosion hazard due to incorrect infeed
The use of Power over Ethernet (PoE) is not permitted for Ex nA rack-mounted devices.
• Only connect the device to an Ethernet without power supply.
Unsuitable reference gas
Explosion hazard
The introduction into the OXYMAT 7 of a sample gas unsuitable for combustible media at
sample gas pressures of over 1100 hPa can lead to an explosion.
• Use only nitrogen as the reference gas.
• Make sure that the reference gas pressure is at least 2200 hPa (3200 hPa abs.) at all
64
WARNING
compressed air gun. Cleaning by pre-purging is not permitted.
WARNING
WARNING
times.
Devices in explosion-proof design
Compact Operating Instructions, 11/2019, A5E35134047-04