Product details
KFD2-SCD2-EX1.LK | Pepperl+Fuchs | Analog Isolator
K-System | SIL 2 | Ex ia output | 4-20 mA
This analog isolator transfers 4-20 mA signals safely. It provides galvanic isolation between control and field sides. In addition, it supports Ex ia outputs for hazardous areas. Moreover, it meets SIL 2 per IEC/EN 61508. Its compact B1 housing saves space.
Key Highlights
- SIL 2 rated for functional safety applications
- Ex ia output for Zone 0, 1, 2 hazardous areas
- High accuracy of 0.1% including non-linearity and hysteresis
- Wide supply range 20-35 V DC (Power Rail or terminals)
- Fast response with rise time < 100 µs
- Ex nA approval for Zone 2 installations
Technical Data
- Brand: Pepperl+Fuchs
- Model: KFD2-SCD2-EX1.LK
- Type: Analog Isolator (K-System)
- Signal Type: Analog output
- SIL Rating: SIL 2
- Supply Voltage: 20 … 35 V DC (Power Rail or terminals 11+, 12-)
- Power Dissipation: 1.1 W at 20 mA into 10 V load
- Power Consumption: 1.3 W
- Input (Control Side):
- Terminals: 7-, 8+
- Input resistance: > 100 kΩ (field wiring < 50 Ω) or > 800 Ω at 20 mA
- Current range: 4 … 20 mA (limited to approx. 25 mA)
- Output (Field Side):
- Terminals: 1+, 2-
- Current: 4 … 20 mA
- Load range: 100 … 700 Ω
- Voltage at 20 mA: ≥ 14 V
- Accuracy: 0.1 % (including non-linearity and hysteresis)
- Temperature Influence: ≤ ± 20 ppm/K
- Rise Time: < 100 µs (10 … 90 % bounce)
- Galvanic Isolation: Basic insulation (50 V AC) between Input and Power Supply
- Ambient Temperature: -20 … 60 °C
- Protection Degree: IP20
- Dimensions: 20 x 115 x 115 mm (W x H x D)
- Mounting: 35 mm DIN rail
Expert Review & Manager’s Insight
Expert Review: The KFD2-SCD2-EX1.LK excels in precision signal transfer. Its Ex ia output suits Zone 0 applications. Moreover, the fast response time ensures accurate control loops. It works reliably in SIL 2 systems.
Manager’s Insight: This isolator reduces wiring complexity. The Power Rail option cuts installation time. In addition, the compact 20 mm width saves panel space. It offers great value for hazardous area installations.
Compatibility & Applications
- Compatible Systems: Any PLC or DCS with 4-20 mA outputs. Works with Pepperl+Fuchs K-System and Power Rail.
- Ideal For:
- Hazardous area actuators (Zone 0, 1, 2)
- I/P converters and valve positioners
- 4-20 mA signal isolation
- Ex ia loops requiring SIL 2
- Application Scenarios: Oil & gas, chemical plants, pharmaceutical manufacturing, and food processing.
Installation & Maintenance
- Installation: Snap onto 35 mm DIN rail. Connect inputs to terminals 7-, 8+. Connect outputs to terminals 1+, 2-. Use Power Rail or terminals 11+, 12- for supply.
- Configuration: No DIP switch settings required. The device is ready to use out of the box.
- Maintenance: No regular maintenance needed. LEDs show status at a glance.
- Debugging: Check LED indicators. Verify input current and output voltage.
Environmental & Immunity
- Temperature Range: -20 to +60 °C (operating)
- Storage Temperature: -40 to +80 °C
- Humidity: 5-95% RH (non-condensing)
- EMC: EN 61326-1:2013 (industrial locations)
- NE 21 compliant
Certifications & Compliance
- ATEX: BAS 00 ATEX 7215 (Ex ia) and TÜV 99 ATEX 1499 X (Ex nA)
- IECEx: BAS 16.0045 (Ex ia)
- FM: Control drawing 116-0129
- UL: Control drawing 116-0173 (cULus)
- SIL: 2 per IEC/EN 61508
Packaging & Delivery
- Package Contents: KFD2-SCD2-EX1.LK module, terminal blocks, documentation.
- Warranty: 12 months from purchase date.
- Shipping: 12-24 hours dispatch via FedEx, UPS, or DHL (tracking provided).
Frequently Asked Questions (FAQ)
- What is the difference between KFD2 and KCD2 series?
KFD2 series are analog isolators. KCD2 series are switch amplifiers. Choose KFD2 for 4-20 mA signals.
- Can I use this isolator with a 500 Ω load?
Yes. The output supports loads from 100 to 700 Ω. For example, 500 Ω is within range.
- What is the maximum safe voltage (Um) for Ex ia?
The Um is 250 V rms. However, the rated voltage may be lower depending on application.
- How does temperature affect accuracy?
Temperature influence is ≤ ±20 ppm/K. This ensures stable performance across the range.
- Is the Power Rail mandatory?
No. You can power it via terminals 11+, 12- instead. Power Rail is optional and convenient.
Selection Guide & Expert Tips
- For Ex ia applications: This isolator is an excellent choice. Its output is intrinsically safe for Zone 0.
- For Zone 2 only: The Ex nA version (without Ex ia) may be more cost-effective.
- For high-density panels: The 20 mm width saves space. Use the Power Rail to reduce wiring.
- Pro tip: Always match the load resistance (100-700 Ω) for optimal performance.
- Safety note: This isolator provides safe electrical isolation (375 V peak) between input and output.
Compare with Similar Models
- KFD2-SCD2-EX1 – similar but without “.LK” suffix
- KFD2-STC4-EX1 – temperature converter version
- KFD2-SOT2-EX2 – 2-channel version
Contact Information Inquiries:
sales@powergearx.com |
+86 18030005825
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