PEPPERL+FUCHS KFD2SR2EX2.W – Isolated Switch Amplifier | KFD2 Series Platform
Engineering Background: In hazardous-area installations — oil & gas wellheads, chemical reactor floors, offshore platforms — a single unprotected signal path between a field sensor and a safe-area PLC can be catastrophic. Without a certified galvanic isolation barrier, fault currents, ground loops, and ignition-capable energy can propagate directly into Zone 0/1 atmospheres. The KFD2SR2EX2.W was engineered specifically to eliminate that risk: it provides complete galvanic isolation, intrinsic-safety limiting, and SIL 2-capable signal conditioning in a single 20 mm DIN-rail module.
Product Positioning: The KFD2SR2EX2.W belongs to Pepperl+Fuchs’ flagship KFD2 Series — the industry benchmark for isolated barriers in process automation. This 2-channel switch amplifier accepts dry-contact or NAMUR proximity sensor inputs from Ex Zone 0/1/2 (Gas) and Zone 20/21/22 (Dust) environments, conditions the signals, and delivers clean relay or transistor outputs to safe-area control systems. Its SIL 2 rating (IEC 61508) makes it a preferred choice for safety-instrumented systems (SIS) in refining, petrochemical, and pharmaceutical applications worldwide.
Complete Technical Specifications
- Model / SKU: KFD2SR2EX2.W
- Manufacturer: Pepperl+Fuchs
- Series: KFD2 (Isolated Barrier Series)
- Function: 2-Channel Isolated Switch Amplifier
- Input Type: NAMUR sensors / mechanical contacts (Ex side)
- Output Type: Relay output (safe area side)
- Number of Channels: 2
- Supply Voltage: 20–35 V DC (via Power Rail or direct)
- Current Consumption: ≤ 70 mA
- Isolation: Galvanic isolation between input, output, and power supply
- Safety Integrity Level: SIL 2 (IEC 61508)
- Ex Approval: ATEX, IECEx, cULus
- Ex Classification (Field Side): II 2 G Ex ia IIC T6 / Zone 0, 1, 2
- Dust Classification: Zone 20, 21, 22
- Ambient Temperature: –20 °C to +60 °C
- Mounting: DIN rail (35 mm), 20 mm module width
- Housing: Polycarbonate, IP20
- Weight: approx. 790 g (packaged)
- Certifications: ATEX, IECEx, cULus, SIL 2
Note: All specifications are sourced from Pepperl+Fuchs official documentation. Konmask.com does not fabricate or alter manufacturer data.
Proven Application Environments
- Oil & Gas: Wellhead valve position feedback, pipeline leak-detection sensor interfaces, compressor station ESD loops
- Petrochemical & Refining: Reactor level switch monitoring, distillation column safety interlocks, flare-stack ignition control
- Pharmaceutical & Fine Chemical: Classified-area agitator status, pressure switch monitoring in ATEX Zone 1 vessels
- Offshore & Marine: Ballast control, bilge-pump status, fire & gas detection panel interfaces
- Power Generation: Turbine hall proximity sensor conditioning, generator protection relay interfaces
- Mining & Minerals: Conveyor belt run/stop monitoring in dusty Zone 21 environments
Engineering Advantages
- True Galvanic Isolation: Eliminates ground loops and common-mode interference — critical in large plant installations with multiple earthing points.
- Dual-Channel Architecture: Two independent signal paths in one 20 mm module reduce panel space by up to 50% versus single-channel alternatives.
- SIL 2 Certified: Pre-validated for use in IEC 61511 Safety Instrumented Systems — reduces your functional-safety engineering burden.
- NAMUR & Dry-Contact Compatible: Accepts both NAMUR EN 60947-5-6 proximity sensors and conventional mechanical contacts without rewiring.
- Power Rail Compatible: Plugs directly into Pepperl+Fuchs Power Rail bus — eliminates individual power wiring per module.
- LED Diagnostics: Per-channel status LEDs provide instant visual fault indication without test equipment.
- Wide Supply Range: 20–35 V DC tolerance accommodates voltage drops in long cable runs.
System Architecture & Signal Flow
The KFD2SR2EX2.W operates as a transparent signal conditioner between the hazardous-area field device and the safe-area control system:
- Field Input (Ex Zone): NAMUR proximity sensor or dry contact wired to terminals 1–3 (Ch1) and 4–6 (Ch2). Intrinsic-safety energy limiting prevents ignition-capable sparks.
- Galvanic Isolation Stage: Transformer-based isolation provides >500 V AC reinforced insulation between field and safe-area circuits.
- Signal Conditioning: Internal logic evaluates sensor state, wire-break, and short-circuit conditions per NAMUR NE 43.
- Safe-Area Output: Relay contacts (or transistor, depending on variant) switch the conditioned signal to PLC DI card, safety relay, or DCS module.
- Power Supply: Sourced from Power Rail or direct 24 V DC terminals — no separate power module required when using Power Rail.
Compatible safe-area systems include Siemens S7/S5 DI modules, ABB System 800xA, Emerson DeltaV, Honeywell Experion, and Yokogawa CENTUM VP.
Sourcing & Quality Verification
Konmask.com sources the KFD2SR2EX2.W exclusively through verified supply channels. Every unit undergoes the following before dispatch:
- Visual inspection of housing, terminals, and label integrity
- Verification of manufacturer serial number and date code
- Functional power-on test confirming LED status and output continuity
- Original manufacturer packaging preserved where available
- Certificate of conformity and test report provided on request
Procurement Process
- Submit Inquiry: Email [email protected] or call +0086 19859288691 with your required quantity and delivery timeline.
- Receive Quotation: Our technical team responds within 24 hours with pricing, lead time, and availability confirmation.
- Order Confirmation: Issue your PO against our proforma invoice. We accept T/T, L/C, and major trade-finance instruments.
- Quality Inspection: Pre-shipment inspection report and photos provided upon request.
- Shipment & Documentation: DHL / FedEx / sea freight with full commercial invoice, packing list, and COO documentation.
- After-Sales Support: Technical assistance available post-delivery for installation and commissioning queries.
Technical FAQ
- Q: Can the KFD2SR2EX2.W be used with 2-wire NAMUR sensors?
- A: Yes. The module is fully compatible with 2-wire NAMUR proximity sensors per EN 60947-5-6, providing the correct 8 V / 8 mA NAMUR supply on the field terminals.
- Q: Is this module suitable for SIL 2 safety loops?
- A: Yes. The KFD2SR2EX2.W carries IEC 61508 SIL 2 certification. Refer to the Pepperl+Fuchs Safety Manual for PFD/PFH values required for your SIL verification calculation.
- Q: What is the maximum cable length to the field sensor?
- A: Maximum cable capacitance and inductance are defined by the ATEX entity parameters (Ci, Li). Consult the certificate and the sensor’s entity parameters to calculate the maximum permissible cable length for your installation.
- Q: Can I use this module without the Power Rail?
- A: Yes. Direct 24 V DC wiring to the power supply terminals is supported. The Power Rail is optional but recommended for large multi-module installations.
- Q: Does Konmask.com provide a warranty?
- A: We offer a 12-month warranty against manufacturing defects. Warranty claims are processed in coordination with the manufacturer’s service network.
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Contact: [email protected] | +0086 19859288691
