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Switch Amplifier
Features
• 2-channel isolated barrier
• 24 V DC supply (Power Rail)
• Dry contact or NAMUR inputs
• Passive transistor output, non-polarized
• Line fault detection (LFD)
• Reversible mode of operation
• Up to SIL 2 acc. to IEC 61508
Function
This isolated barrier is used for intrinsic safety applications. It
transfers digital signals (NAMUR sensors/mechanical
contacts) from a hazardous area to a safe area.
Each proximity sensor or switch controls a passive transistor
output for the safe area load. The normal output state can be
reversed using switch S1 for channel I and switch S2 for
channel II. Switch S3 enables or disables line fault detection of
the field circuit.
During an error condition, the transistors revert to their de-
energized state and LEDs indicate the fault according to
NAMUR NE44.
A unique collective error messaging feature is available when
used with the Power Rail system.
Connection
I
II
Zone 0, 1, 2
Div. 1, 2
Refer to "General Notes Relating to Pepperl+Fuchs Product Information".
Pepperl+Fuchs Group
USA: +1 330 486 0002
www.pepperl-fuchs.com
pa-info@us.pepperl-fuchs.com
400 Ω ≤ R ≤ 2 kΩ
10 kΩ
10 kΩ
400 Ω ≤ R ≤ 2 kΩ
10 kΩ
10 kΩ
Germany: +49 621 776 2222
pa-info@de.pepperl-fuchs.com
Assembly
Front view
LED yellow:
Transistor output I
LED red:
LB/SC channel I
LED yellow:
Transistor output II
LED red:
LB/SC channel II
KFD2-SOT2-Ex2
1+
2+
3-
4+
5+
6-
ERR
24 V DC
Power Rail
Singapore: +65 6779 9091
pa-info@sg.pepperl-fuchs.com
KFD2-SOT2-Ex2
Removable terminals
blue
1
2
3
4
5
6
KFD2-SOT2-Ex2
LED green:
1
Power supply
OUT CHK PWR
2
S1
Switch S1
S2
S3
(mode of operation channel I)
I
II
Switch S2
(mode of operation channel II)
7
8
9
10
11
12
13
14
15
Switch S3
(LB/SC-monitoring)
Removable terminals
green
2
7
I
8 (+/-)
II
9
14+
24 V DC
15-
Zone 2
Div. 2
1
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