Pepperl+Fuchs
Pepperl+Fuchs KFD2-SR2-Ex2.W – Isolated Barrier Switch Amplifier
Pepperl+Fuchs KFD2-SR2-Ex2.W – Isolated Barrier Switch Amplifier
Manufacturer part number: KFD2-SR2-Ex2.W
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ENQUIRE NOWProduct Overview
The Pepperl+Fuchs KFD2-SR2-Ex2.W is a 2-channel isolated barrier switch amplifier from the K-System range. It transfers digital signals from NAMUR sensors or dry contacts located in a hazardous area to relay contact outputs in the safe area, with reinforced galvanic isolation between input, output and power supply circuits.
The module is powered at 24 V DC via the Pepperl+Fuchs Power Rail or terminals, and its intrinsically safe [Ex ia] inputs are certified under ATEX and IECEx. Line fault detection (LFD), a reversible mode of operation set by DIP switch and suitability for applications up to SIL 2 (SC 3) to IEC/EN 61508 make it a dependable interface for level, position and limit-switch signals in process plants.
Key Features
- Manufacturer: Pepperl+Fuchs
- Model: KFD2-SR2-Ex2.W
- Product type: Isolated Barrier Switch Amplifier
- 2-channel isolated barrier with relay contact outputs
- Inputs for NAMUR sensors (EN 60947-5-6) or dry contacts
- 24 V DC supply via Power Rail or terminals
- Line fault detection (lead breakage and short circuit)
- Reversible mode of operation, configured by DIP switches
- Up to SIL 2 (SC 3) to IEC/EN 61508
- ATEX and IECEx certified [Ex ia] inputs
Technical Specifications
| Manufacturer | Pepperl+Fuchs |
|---|---|
| Part number | KFD2-SR2-Ex2.W |
| Product type | 2-channel isolated barrier / switch amplifier |
| Signal type | Digital input |
| Rated supply voltage | 19 … 30 V DC (Power Rail or terminals 14+, 15-) |
| Rated current | ≤ 50 mA |
| Power dissipation | ≤ 1 W |
| Input | NAMUR to EN 60947-5-6 or dry contact; approx. 8 V DC / 8 mA |
| Switching point / hysteresis | 1.2 … 2.1 mA / approx. 0.2 mA |
| Line fault detection | Breakage I ≤ 0.1 mA, short circuit I > 6 mA |
| Outputs | 2 × relay (terminals 7, 8, 9 and 10, 11, 12) |
| Contact loading | 250 V AC / 2 A / cos φ > 0.75; 40 V DC / 2 A resistive |
| Switching frequency | ≤ 10 Hz |
| Functional safety | SIL 2, systematic capability SC 3 (IEC/EN 61508) |
| Ambient temperature | -40 … 70 °C |
| Degree of protection | IP20 |
| Dimensions | 20 x 119 x 115 mm (W x H x D), housing type B2 |
| Mass | approx. 150 g |
| Mounting | 35 mm DIN mounting rail (EN 60715) |
| ATEX | PTB 00 ATEX 2080 — II (1)G [Ex ia Ga] IIC, II (1)D [Ex ia Da] IIIC, I (M1) [Ex ia Ma] I; TÜV 99 ATEX 1493 X — II 3G Ex ec nC IIC T4 Gc |
| IECEx | IECEx PTB 11.0034, IECEx TUN 19.0013X |
| Other approvals | FM (FM19US0207X), UL/cULus (E106378) |
Specifications are taken from Pepperl+Fuchs manufacturer data. Always confirm critical values — particularly hazardous-area and functional-safety data — against the current datasheet, certificates and instruction manual before installation.
Applications
- Hazardous-area limit switch and valve position feedback
- Level switch signals from tanks and vessels in Ex zones
- Interfacing NAMUR proximity sensors to PLC and DCS digital inputs
- Safety instrumented functions up to SIL 2
Installation and Compatibility
Mount on a 35 mm DIN rail in the safe area or, where permitted by the Ex ec certificate, in Zone 2. The unit can draw its 24 V DC supply from the Power Rail, which also carries the collective error message. Field wiring connects to terminals 1–6 and the relay outputs to terminals 7–12. Always follow the certificate, instruction manual and control drawings when designing intrinsically safe loops.
Frequently Asked Questions
What is the Pepperl+Fuchs KFD2-SR2-Ex2.W?
The Pepperl+Fuchs KFD2-SR2-Ex2.W is a 2-channel isolated barrier switch amplifier from the K-System range. It transfers digital signals from NAMUR sensors or dry contacts located in a hazardous area to relay contact outputs in the safe area, with reinforced galvanic isolation between input, output and power supply circuits.
What supply does the KFD2-SR2-Ex2.W need?
19 … 30 V DC (Power Rail or terminals 14+, 15-).
How do I get a price for the KFD2-SR2-Ex2.W?
This product is sold on a price on availability basis. Use the enquiry form on this page with your quantity and application details and the Valves UK team will reply with pricing and lead time.
Technical Documentation
- Pepperl+Fuchs KFD2-SR2-Ex2.W datasheet (PDF)
- KFD2-SR2-Ex2.W on the Pepperl+Fuchs website (certificates, manuals and drawings)
Related Products
- Pepperl+Fuchs KFD2-SR2-Ex1.W – Switch Amplifier
- Pepperl+Fuchs KFD2-SRA-Ex4 – 4-Channel Switch Amplifier
- View the full Pepperl+Fuchs range at Valves UK
Price and Availability
Price on Availability (POA)
Contact Valves UK for pricing, product availability and technical enquiries regarding the Pepperl+Fuchs KFD2-SR2-Ex2.W. Please include your required quantity and any relevant application details when submitting your enquiry.
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