KFD2-STC4-Ex2, SMART Transmitter Power Supply

Mfr.: Pepperl+Fuchs Process Automation

Mfr. Model #: KFD2-STC4-Ex2

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16 in stock

  • $695.00
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SMART Transmitter Power Supply, KFD2-STC4-Ex2


  • 2-channel isolated barrier
  • 24 V DC supply (Power Rail)
  • Input 2-wire SMART transmitters
  • Output 0/4 mA ... 20 mA
  • Terminals with test points
  • Up to SIL 2 acc. to IEC/EN 61508

This isolated barrier is used for intrinsic safety applications.

The device supplies 2-wire SMART transmitters in a hazardous area.

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.

Product Description
Input 0/4 mA ... 20 mA
Output 0/4 mA ... 20 mA
General specifications
Signal type Analog input
Functional safety related parameters
Safety Integrity Level (SIL) SIL 2
Connection Power Rail or terminals 14+, 15-
Rated voltage 20 ... 35 V DC
Ripple within the supply tolerance
Power dissipation 1.8 W
Power consumption max. 2.7 W
Connection side field side
Connection terminals 1+, 3-; 4+, 6-
Input signal 0/4 ... 20 mA
Available voltage 16 V at 20 mA, terminals 1+, 3
Connection side control side
Connection terminals 7-, 8+; 10-, 11+
Load 0 ... 550 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
Influence of ambient temperature 0.25 µA/K
Frequency range field side into the control side: band width with 1 Vpp signal 0 ... 7.5 kHz (-3 dB)
safe area to hazardous area: band width with 1 VSS signal 0.3 ... 7.5 kHz (-3 dB)
Settling time 200 µs
Rise time/fall time 20 µs
Galvanic isolation
Output/power supply functional insulation, rated insulation voltage 50 V AC
Output/Output functional insulation, rated insulation voltage 50 V AC
Display elements LED
Labeling space for labeling at the front
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EU EN 61326-1:2013 (industrial locations)
Electromagnetic compatibility NE 21:2011
Degree of protection IEC 60529:2001
Protection against electrical shock UL 61010-1:2012
Ambient conditions
Ambient temperature -20 ... 60 °C (-4 ... 140 °F)
Degree of protection IP20
Connection screw terminals
Mass approx. 150 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 7025 X
Marking Ex-Hexagon II (1)G [Ex ia Ga] IIC , Ex-Hexagon II (1)D [Ex ia Da] IIIC , Ex-Hexagon I (M1) [Ex ia Ma] I
Input [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I
Voltage 25.2 V
Current 93 mA
Power 0.586 W
Maximum safe voltage 250 V (Attention! The rated voltage can be lower.)
Certificate TÜV 99 ATEX 1499 X
Marking Ex-Hexagon II 3G Ex nA II T4 [device in zone 2]
Galvanic isolation
Input/Output safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Input/power supply safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
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 04.0015X
Approved for [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I
Ex nA IIC T4 Gc
General information
Supplementary information Observe the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see -

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