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 (suciently large
diameter of the supply line).
If purging gas lines are used with a smaller diameter or longer length than specied, pressure
builds up in the Ex p enclosure that lies outside the setpoint range specied in the Ex p
control system.
Electrical connections of the Ex p control system with peripherals (example)
3(
/
1
/
3(
1
)6
65
65
6,352&(66
*$
FigureB-3 Electrical connections of an Exp safety equipment, Gönnheimer ElektronikGmbH
Ex power relay SR853
Connections
16 Power supply cable N
18 Power supply cable L
15 ProtectiveconductorPE
8, 9, 10, 11 Doubly-protected power contacts for the power dis‐
connection of the analyzer device (required to ab‐
sorb high inrush current peaks)
2, 25, 3, 24 Control connections for Ex power relay
1, 26; 12, 15; 13, 14 ProtectiveconductorPE
Ex px safety equipment
B.1Overview
SIPROCESS GA700 rack and wall mounted devices
110 Compact Operating Instructions, 06/2023, A5E35134047-AB
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