KFD2-STC4-1.2O

Subject to reasonable modifications due to technical advances.

Copyright Pepperl+Fuchs, Printed in Germany

Pepperl+Fuchs Group • Tel.: Germany +49-621-776-0 • USA +1-330-4253555 • Singapore +65-67-799091 • Internet www.pepperl-fuchs.com

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SMART Transmitter Power Supply

KFD2-STC4-1.2O

3

5-

6+

1+

2-

7-

8+

9

250 Ω

mA

mA

10-

11+

12

250 Ω

24 V DC

14+

15-

Power Rail

24V DC

I

II

Connection

Assembly

• 1-channel signal conditioner

• 24 V DC supply (Power Rail)

• Input 2-wire and 3-wire SMART transmitters and 2-wire

SMART current sources

• Dual output 0/4 mA ... 20 mA

• Terminal blocks with test points

• Up to SIL3 acc. to IEC 61508

Function

This signal conditioner provides the isolation for non-

intrinsically safe applications.

The device supplies 2-wire and 3-wire SMART transmitters,

and can also be used with 2-wire SMART current sources.

It transfers the analog input signal to the safe area as two

isolated current values.

Digital signals may be superimposed on the input signal 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, 9

and 11, 12 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

Features

1

3

4

6

2

5

13

15

12

9

10

7

14

11

8

KFD2-STC4-1.2O

PWR

Front view

LED green:

Power supply

Removable terminals

green

Removable terminals

green

3