Cut Sheet

Release date 2017-08-09 14:38 Date of issue 2017-08-10 231364_eng.xml
KFD2-STC4-Ex1
1
Refer to "General Notes Relating to Pepperl+Fuchs Product Information".
Pepperl+Fuchs Group USA: [phone] Singapore: [phone]Germany: [phone]
www.pepperl-fuchs.com [e-mail] [e-mail] [e-mail]
SMART Transmitter Power Supply
Zone 2
Div. 2
Zone 0, 1, 2
Div. 1, 2
KFD2-STC4-Ex1
24 V DC
14+
15-
Power Rail
24 V DC
3
5-
6+
1+
2-
7-
8+
9
250 Ω
HART
HART
mA
mA
HART
Connection
Assembly
• 1-channel isolated barrier
• 24 V DC supply (Power Rail)
• Input 2-wire and 3-wire SMART transmitters and 2-wire
SMART current sources
• Output 0/4 mA ... 20 mA
• Terminals with test points
• Up to SIL 2 acc. to IEC 61508
Function
This isolated barrier is used for intrinsic safety applications.
The device supplies 2-wire and 3-wire SMART transmitters in
a hazardous area, and can also be used with 2-wire SMART
current sources.
It transfers the analog input signal to the safe area as an
isolated current value.
Digital signals may be superimposed on the input signal in the
hazardous or safe area and are transferred bi-directionally.
If the HART communication resistance in the loop is too low,
the internal resistance of 250 Ω between terminals 8 and 9
can be used.
Test sockets for the connection of HART communicators are
integrated into the terminals of the device.
Application
The device supports the following SMART protocols:
•HART
•BRAIN
•Foxboro
2
Features
1
3
4
6
2
5
13 15
12
9
10
7
14
11
8
KFD2-STC4-Ex1
PWR
Front view
LED green:
Power supply
Removable terminals
green
Removable terminals
blue