Pepperl fuchs isolated barrier KFD2-STC4-Ex1

Pepperl fuchs isolated barrier KFD2-STC4-Ex1

Pepperl fuchs isolated barrier KFD2-STC4-Ex1

SMART Transmitter Power Supply KFD2-STC4-Ex1
Features:
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
Shipping Weight: 1.6 Kg

SMART Transmitter Power Supply KFD2-STC4-Ex1
Pepperl fuchs isolated barrier KFD2-STC4-Ex1
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

Pepperl fuchs isolated barrier KFD2-STC4-Ex1
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.

Pepperl fuchs isolated barrier KFD2-STC4-Ex1

Application
The device supports the following SMART protocols:
• HART
• BRAIN
• Foxboro

Pepperl fuchs isolated barrier KFD2-STC4-Ex1

General specifications
Signal type Analog input
Functional safety related parameters
Safety Integrity Level (SIL) SIL 2
Supply
Connection Power Rail or terminals 14+, 15-
Rated voltage Ur 20 ... 35 V DC
Ripple within the supply tolerance
Power dissipation 1.4 W
Power consumption 1.8 W
Input
Connection side field side
Connection terminals 1+, 2-, 3 or 5-, 6+
Input signal 0/4 ... 20 mA
Voltage drop ≤ 2.4 V at 20 mA (terminals 5, 6)
Input resistance ≤ 64 Ω terminals 2-, 3 ; ≤ 500 Ω terminals 1+, 3 (250 Ω load)
Available voltage ≥ 16 V at 20 mA terminals 1+, 3
Output
Connection side control side
Connection terminals 7-, 8+, 9
Load 0 ... 800 Ω at 20 mA
Output signal 0/4 ... 20 mA (overload > 25 mA)
Ripple ≤ 50 µA rms
Pepperl fuchs isolated barrier KFD2-STC4-Ex1

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