Ex P Safety Equipment - Siemens SIPROCESS GA700 Compact Operating Instructions

A.1.2.1

Ex p safety equipment

Pneumatic connections of the Ex p control system (example)
A Ex p controller F870S
B Ex power relay SR853
C Ex interface relay SR852, 16-pin
D Proportional valve
E Pressure regulating valve for purg‐
ing gas with gauge
①
Power connection
②
Purging gas connection to the Ex p controller F870S, 12 mm (outer diameter)
③
Purging gas inlet
④
Purging gas outlet
⑤
Purging gas connection from Ex p controller F870S, 12 mm (outer diameter)
⑥
Purging gas connection; supply pressure 2.5 ... 5 bar (rel.)
⑦
Connection from and to Ex interface relay SR852
⑧
Exhaust air outlet. If appropriate connection of a 1" line, max. length 20 m
Figure A-2 Gas path of the Ex p safety equipment, Gönnheimer Elektronik GmbH
Connection information
The supply pressure has to be sufficiently large (2.5 ... 5 bar).
The supply line before the pressure regulating valve has to be dimensioned so that the line
pressure in the inlet does not drop below 2.5 bar during pre-purging (sufficiently large diameter
of the supply line).
If purging gas lines are used with a smaller diameter or longer length than specified, pressure
builds up in the Ex p enclosure that lies outside the setpoint range specified in the Ex p control
system.
Devices in explosion-proof design
Compact Operating Instructions, 01/2022, A5E35134047-11
F Power connection
G Analyzer module 1 (AM1)
H Analyzer module 2 (AM2)
I Flame arresters
J Signal cable connection
Appendix A
A.1 Ex px safety equipment
103