PEPPERL+FUCHS KFD2-STC5-Ex2 Isolated Safety Barrier with 2 Independent Isolated Channels and HART Communication Support for SIL 2 Safety
I. Core Basic Information
Brand / Model: Pepperl+Fuchs KFD2-STC5-Ex2
Product Category: Isolated Safety Barrier (Transmitter Powered Type)
Number of Channels: 2 Independent Isolated Channels
Power Supply: 24 V DC Power Rail, or Terminal 14+/15 - Power Supply
Mounting: 35 mm DIN rail, 20 mm width (B2 housing)
Product Status: In Production, Regular Supply
Core Function: Powers 2/3-wire intelligent transmitters for hazardous areas, provides isolated transmission of 4–20 mA signals, supports HART bidirectional communication
Safety Certifications: ATEX, IECEx, SIL 2 (IEC 61508)
II. Key Technical Parameters
1. Power Supply Parameters
| Parameter | Value |
|---|---|
| Supply Voltage | 18–30 V DC (Typical 24 V) |
| Power Consumption | Maximum 2.6 W (Full Load) |
| Power Loss | Maximum 1.4 W (Full Load) |
2. Field Side (Hazardous Area, Input)
| Parameter | Values |
|---|---|
| Input Signal | 0/4–20 mA (2/3-wire transmitter) |
| Open Circuit Voltage / Short Circuit Current | 23 V / 25 mA |
| Power Supply Capacity | ≥16 V @ 20 mA; ≥20 V @ 4 mA |
| Input Impedance | Maximum 330 Ω |
| Terminals | 1+/2-/3; 4+/5-/6 |
3. Control Side (Safe Area, Output)
| Parameter | Values |
|---|---|
| Output Signal | 0/4–20 mA (Source/Sink Mode) |
| Maximum Load | 0–600 Ω |
| Output Ripple | ≤50 μA rms |
| Accuracy | ±10 μA (including calibration, linearity, temperature drift) |
| Temperature Drift Coefficient | 0.25 μA/K |
| Terminals | 7+/8-/9-; 10+/11-/12- |
4. Mechanical and Environmental
| Parameter | Values |
|---|---|
| Dimensions (W*H*D) | 20*124*115 mm |
| Weight: | Approx. 200 g |
| Protection Rating: | IP20 |
| Operating Temperature: | -20°C to +70°C |
| Isolation Voltage: | Signal Side / Power Side: 500 V DC |
III. Functions and Features
- HART Communication: Built-in 250 Ω HART resistor (terminals 8/9, 11/12), supporting bidirectional HART communication and configuration.
- Test Points: Integrated test points on terminals for convenient on-site commissioning and measurement.
- Wide Temperature Range: Maximum operating temperature up to 70°C, suitable for high-temperature conditions.
- SIL 2 Safety Rating: Meets functional safety requirements, suitable for critical control loops.
- Plug and Play: No configuration required, works immediately upon power-up, supports 2/3-wire transmitters.
IV. Typical Application Scenarios
- Signal isolation and power supply for 4–20 mA smart transmitters (pressure, temperature, level, flow) in hazardous areas (Zone 0/1/2).
- Process control in explosion-proof environments such as chemical, petroleum, natural gas, and pharmaceutical industries.
- Signal isolation and HART communication between DCS/PLC systems and field instruments.
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