鈥?/div>
Control circuit EEx ia IIC
24 V DC nominal supply voltage
Reversible mode of operation
Lead monitoring (short circuit LK and
interruption LB) with LED indicator
(red flashing), switching output and
signal on Power Rail
鈥?50 % less wiring 2 : 1
鈥?2 relay outputs, 1 NO contact per
channel, grouped into single-pole
pairs
鈥?EMC acc. to NAMUR NE 21
4-channel
KFD2-SRA-Ex 4
Switch S2 in position
II
1-
1-
2+
2+
2+
3-
3-
4-
4-
5+
5+
5+
6-
6-
yellow
S2
I II
S6
II
LB
SC
yellow
red
S1
S2
I II
S5
S4
II
LB
SC
red
I
S3
S1
KFD2-SRA-Ex4
2-channel
KFD2-SRA-Ex 2
+ -
1
KFD2-SRA-Ex2
Function
The transformer isolated barrier trans-
fers digital signals from the hazardous
area. The inputs are designed for the
connection of NAMUR sensors per
DIN EN 60947-5-6 or a mechanical
contact.
The input, output and power supply are
galvanically isolated from each other.
The relay output and the power supply
are galvanically isolated from each
other per DIN EN 50178 with a design
isolation voltage of AC 50 V.
7
8
9
Output
I
Output
II
10 11 12
Output
III
Output
IV
14+ 15-
+
-
Power Power LB-collective
supply rail error message
Aufbau
Application
Min/Max manometer, valve positioners,
magnetic immersion probes with 2
switch points.
Two signals can be monitored through
one dual lead in the 2:1 mode of opera-
tion (AC), reducing wiring by fifty per-
cent.
Safe area
Ausgabedatum
28.2.01
I
Subject to reasonable modifications due to technical advances.
Copyright Pepperl+Fuchs, Printed in Germany
1
Pepperl+Fuchs Group 鈥?Tel.: Germany (06 21) 7 76-0 鈥?USA (330) 4 25 35 55 鈥?Singapore 7 79 90 91 鈥?Internet http://www.pepperl-fuchs.com
Hazardous area
+
Switch S2 in position
I
1
2
3
4
