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Pepperl+Fuchs KFD2-STC4-1
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KUKA KCP2 00-130-547
KUKA KCP2 00-130-547
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Pepperl+Fuchs KFD0-TR-EX1
Pepperl+Fuchs KFD0-TR-EX1

Pepperl+Fuchs KFD2-STC4-1

Product Name:​ Pepperl+Fuchs KFD2-STC4-1 1-Channel Intrinsically Safe Analog Input Isolator with HART Transparency
Product Introduction:​
The KFD2-STC4-1 is a loop-powered isolated barrier that transfers a 4–20 mA signal from a 2-wire smart transmitter in the hazardous area to the safe area, while providing full bidirectional transparency for HART digital communication. It requires no external auxiliary power — it is powered from the control-side loop.
Category:
Description
Technical Specifications:
  • Manufacturer:​ Pepperl+Fuchs GmbH
  • Model:​ KFD2-STC4-1 (K-System)
  • Channels:​ 1 (analog input, isolated)
  • Field Input:​ 4–20 mA from Ex i 2-wire transmitter (Zone 0/1, Div. 1)
  • Control Room Output:​ 4–20 mA passive (loop-powered from DCS AI card)
  • HART Support:​ Fully transparent to HART revisions 5/6/7
  • Accuracy:​ ±0.1 % of span
  • Temperature Coefficient:​ < 100 ppm/°C
  • Response Time:​ < 20 ms
  • Voltage Drop (Barrier):​ approx. 3–4 V at 20 mA
  • Intrinsic Safety Parameters (Typical):​ Uo ≤ 28 V, Io ≤ 93 mA, Po ≤ 0.65 W (verify cert for your Ex ia entity)
  • Safety Certification:​ ATEX, IECEx, FM, CSA; SIL 2 per IEC 61508
  • Hazardous Area Marking:​ Ex ia IIC T4/T5 Ga/Gb
  • Housing Width:​ 12.5 mm
  • Mounting:​ 35 mm DIN rail
  • Ambient Temp:​ -20 °C to +60 °C
  • Protection:​ IP20
  • Terminals:​ Screw-type, tin-plated copper alloy
Functional Features:
  • Loop-powered — no separate 24 V DC required
  • HART digital signal passes unchanged (amplitude preserved within spec)
  • Open-circuit / short-circuit detection capability (depends on DCS AI card)
  • DIP switches for range selection in some variants (KFD2-STC4-Ex1 has more config; -1 is fixed-range)
Material & Construction:
  • Polyamide housing (UL94-V0)
  • Nickel-plated brass terminals
Installation Notes:
  • Install in safe area (Zone 2 / Division 2) only
  • Ensure DCS analog input card can supply enough loop voltage after the barrier’s voltage drop (~3.5 V)
  • Segregate IS and non-IS wiring
  • Verify Entity Parameters (Ui, Ii, Pi) of field transmitter do not exceed barrier’s Uo, Io, Po
Applications:​ Connecting HART smart pressure/temperature/flow transmitters in hazardous areas to DeltaV, Siemens, Rockwell, or Honeywell DCS analog input cards with HART multiplexing.
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