Siemens SIPROCESS GA700 Compact Operating Instructions page 57

Absence of pre-purging
Danger of explosion in hazardous areas.
An explosive atmosphere existing in a device with pressurized enclosure (type of protection
Ex p) can result in an explosion during commissioning.
• Make sure that the device is pre-purged before it is commissioned.
• Make sure that the purging time, quantity and medium are correctly observed. Refer to
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 of a reference gas that is unsuitable for combustible media can result in an
explosion.
• Only use nitrogen as the reference gas.
• Also ensure that the reference gas pressure always lies in the range of 2000 hPa to
Devices in explosion-proof design
Compact Operating Instructions, 05/2018, A5E35134047-03
WARNING
the information in Chapter "Technical specifications (Page 83)".
WARNING
compressed air gun. Cleaning by pre-purging is not permitted.
WARNING
WARNING
2200 hPa above the sample gas pressure.
6.2 Safety instructions for hazardous areas
Commissioning
57