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

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

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