A.1.2.1 Ex P Safety Equipment - Siemens SIPROCESS GA700 Kompaktbetriebsanleitung

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; fusing 16 A
②
Connection to Ex p controller F870S; conductor cross-section 8 mm, max. length 10 m
③
Purging gas inlet
④
Purging gas outlet
⑤
Connection from Ex p controller F870S; conductor cross-section 8 mm, max. length 10 m
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, 11/2019, A5E35134047-04
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
113