Connection Diagrams - Siemens SIPROCESS GA700 Compact Operating Instructions

Appendix A
A.1 Ex px safety equipment
You will find the information relevant for installation and operation of the Ex p safety
equipment with the wall-mounted device in the corresponding manufacturer documentation.
The connection diagram shown below refers to the example of the pressurized enclosure
system "F870S-HD" distributed by Gönnheimer Elektronik GmbH:
If you are using safety equipment from other manufacturers, contact your Siemens service
partner, if applicable.
A.1.2

Connection diagrams

Accumulation of potentially explosive gases
Explosion hazard
Potentially explosive gases can accumulate in the enclosure during maintenance work.
• Purge the enclosure with inert gas once maintenance work is complete.
Note
Optical signaling of the maintenance mode
To recognize the enabled maintenance mode (Bypass) of the Ex p safety equipment, we
recommend connecting an optical sensor on site.
112
WARNING
Devices in explosion-proof design
Compact Operating Instructions, 11/2019, A5E35134047-04