•  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 of Pepperl+Fuchs KFD2-STC4-EX1 Safety Barriers KFD2-STC4-EX1 SMART Transmitter Power Supply
 
•  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 of Pepperl+Fuchs KFD2-STC4-EX1 Safety Barriers KFD2-STC4-EX1 SMART Transmitter Power Supply
 
The device supports the following SMART protocols:
• HART
• BRAIN
• Foxboro
  

General specifications of Pepperl+Fuchs KFD2-STC4-EX1 Safety Barriers KFD2-STC4-EX1 SMART Transmitter Power Supply
Signal type	Analog input
Functional safety related parameters
Safety Integrity Level (SIL)	SIL 2
Supply
Connection	Power Rail or terminals 14+, 15-
Rated voltage	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	max. 50 µA rms
Transfer characteristics
Deviation	at 20 °C (68 °F), 0/4 ... 20 mA ≤ 10 µA incl. calibration, linearity, hysteresis, loads and fluctuations of supply voltage
Frequency range	field side into the control side: bandwidth with 0.5 Vpp signal 0 ... 7.5 kHz (-3 dB)  control side into the field side: bandwidth with 0.5 Vpp signal 0.3 ... 7.5 kHz (-3 dB)
Settling time	200 µs
Rise time/fall time	20 µs
Indicators/settings
Display elements	LED
Labeling	space for labeling at the front
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EU	EN 61326-1:2013 (industrial locations)
Conformity
Electromagnetic compatibility	NE 21:2011
Degree of protection	IEC 60529:2001
Ambient conditions
Ambient temperature	-20 ... 60 °C (-4 ... 140 °F)
Mechanical specifications
Degree of protection	IP20
Connection	screw terminals
Mass	approx. 200 g
Dimensions	20 x 124 x 115 mm (0.8 x 4.9 x 4.5 inch) , housing type B2
Mounting	on 35 mm DIN mounting rail acc. to EN 60715:2001
Data for application in connection with hazardous areas
EU-Type Examination Certificate	BAS 99 ATEX 7060 X
Marking	II (1)G [Ex ia Ga] IIC ,  II (1)D [Ex ia Da] IIIC ,  I (M1) [Ex ia Ma] I
Certificate	TÜV 99 ATEX 1499 X
Marking	II 3G Ex nA II T4 [device in zone 2]
Directive conformity
Directive 2014/34/EU	EN 60079-0:2012+A11:2013 , EN 60079-11:2012 , EN 60079-15:2010
International approvals
UL approval
Control drawing	116-0428 (cULus)
IECEx approval	IECEx BAS 04.0016X  IECEx CML 15.0055X
Approved for	[Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I Ex nA IIC T4 Gc

Ordering Codes of Pepperl+Fuchs KFD2-STC4-EX1 Safety Barriers KFD2-STC4-EX1 SMART Transmitter Power Supply