Pepperl & Fuchs – KFD2‑STC4‑Ex1.H (192017) – 1‑Channel SMART Transmitter Power

The Pepperl & Fuchs KFD2‑STC4‑Ex1.H is a single-channel SMART transmitter power supply and isolated barrier, certified SIL 2, ideal for intrinsically‑safe 4–20 mA loops in hazardous environments. It reliably powers 2‑wire or 3‑wire SMART transmitters and transparently transfers HART, BRAIN, and Foxboro signals between Ex area and safe control system. Featuring high field voltage and test-point terminals, it ensures robust loop power and diagnostic access.

Key Features & Specifications:

• Model: KFD2‑STC4‑Ex1.H (Pepperl & Fuchs P/N 192017)  

• Certification: SIL 2 per IEC/EN 61508; Zone 0/1/2 & Div 1/2 intrinsic‑safe protection  

• Signal Support: Input from 2‑wire/3‑wire SMART transmitters or 2‑wire SMART current sources; bidirectional HART/BRAIN/Foxboro transparent communication  

• Supply Voltage: 20–35 V DC via Power Rail or terminals; power consumption ~1.9 W  

• Field Voltage: ≥ 17.6 V DC at 20 mA load  

• Output: 0/4…20 mA DC, supports 0–800 Ω load; max ripple ≤ 50 µA RMS  

• Accuracy: ≤ 10 µA deviation at 20 °C (includes calibration, load, temperature variance)  

• Bandwidth: 0–7.5 kHz signal path; settling time ~200 µs; rise/fall ~20 µs  

• Isolation: Functional insulation rated 50 V AC between supply/output  

• Indicators & Access: LED status indicator; integrated test sockets for easy loop diagnostics  

• Mounting & Housing: 20 mm width, DIN-rail mountable, IP20 enclosure; operating range –20…+60 °C