KFD2-SR2-EX2.2S Pepperl+Fuchs Isolated Switch Amplifier SIL 2

Product Description

The KFD2-SR2-EX2.2S from Pepperl+Fuchs is a digital input isolated switch amplifier with SIL 2 rating. It connects NAMUR sensors to a safe control system. Two independent relay channels provide isolated outputs. The device is certified for hazardous area applications (Zone 0/1/2). Its compact housing fits standard DIN rails. This amplifier ensures reliable signal transmission in demanding industrial environments.

Technical Specifications

• Brand: Pepperl+Fuchs
• Model: KFD2-SR2-EX2.2S
• Type: Isolated Switch Amplifier, Digital Input
• SIL Rating: SIL 2
• Supply Voltage (Ur): 20 … 30 V DC (Power Rail or terminals 14+, 15-)
• Ripple: ≤ 10 %
• Rated Current (Ir): ≤ 50 mA
• Power Consumption: < 1.3 W
• Input (NAMUR acc. EN 60947-5-6): Terminals 1+,2+,3- / 4+,5+,6-
• Open Circuit Voltage: approx. 8 V DC
• Short-circuit Current: approx. 8 mA
• Switching Point / Hysteresis: 1.2 … 2.1 mA / approx. 0.2 mA
• Line Fault Detection: Breakage ≤ 0.1 mA, Short-circuit > 6 mA
• Min. Pulse/Pause Ratio: 20 ms / 20 ms
• Output (Relay): Terminals 7,8 / 8,9 / 10,11 / 11,12
• Contact Loading: 50 V AC/1 A / 40 V DC/1 A (resistive)
• Min. Switching Current: 1 mA @ 24 V DC
• Switching Frequency: ≤ 10 Hz
• Response Time (Energized/De-energized): approx. 20 ms / 20 ms
• Mechanical Life: 10⁸ switching cycles
• Galvanic Isolation: Input/Output (reinforced, 300 Veff), Input/Power (reinforced, 300 Veff), Output/Power (basic, 32 Veff)
• Ambient Temperature: -20 … 60 °C (-4 … 140 °F)
• Protection Class: IP20
• Mounting: 35 mm DIN rail (EN 60715)
• Dimensions (W x H x D): 20 x 119 x 115 mm (0.8 x 4.7 x 4.5 inch), Housing B2
• Weight: approx. 150 g
• Display & Control: LEDs, DIP switches for configuration

Hazardous Area Data (ATEX / IECEx)

• ATEX Certificate: PTB 00 ATEX 2083 (II (1)GD [EEx ia] IIC)
• Input Parameters (EEx ia IIC): Uo = 10.5 V, Io = 13 mA, Po = 34 mW
• Maximum Safe Voltage (Um): 253 V AC / 125 V DC (not rated voltage)
• Output Maximum Safe Voltage: 253 V AC (rated voltage may be lower)
• IECEx Marking: Ex ec nC IIC T4 Gc (Certificate IECEx TUN 19.0013X)
• FM & CSA Approvals: Control drawings 116-0035 (FM) and 116-0047 (CSA)

Compatibility & Compliance

• EN 60947-5-6 (NAMUR) input, EN 61326-1 (industrial EMC), EN 61010-1 (low voltage)
• Directives: 2014/30/EU (EMC), 2014/35/EU (LVD), 2014/34/EU (ATEX)
• Safe electrical isolation acc. to IEC/EN 60079-11 (375 V peak)
• Line fault detection (LFD) for breakage and short-circuit

Installation & Mounting

• Snap onto 35 mm DIN rail according to EN 60715.
• Use screw terminals (0.8 Nm torque) for field and control side wiring.
• Observe polarity for power supply (terminals 14+, 15-).
• Ensure adequate ventilation; ambient temperature range -20 … +60 °C.
• Configure switching behavior via DIP switches (easy access at front).

Commissioning & Maintenance

• LED indicators show power and channel status for quick diagnostics.
• DIP switches allow on-site configuration without software.
• Labeling space at the front simplifies identification.
• Collective error message via Power Rail simplifies system monitoring.
• Periodic visual inspection recommended (no calibration required).

Applications & Suitable Devices

• Connects NAMUR proximity sensors, mechanical contacts, or pushbuttons.
• Use in safety loops up to SIL 2 (IEC 61508).
• Ideal for level monitoring, flow detection, and position sensing.
• Suitable for Zone 0/1/2 hazardous areas (gas/dust).
• Works with PLCs, DCS, or relay logic systems.

Expert Review / Manager’s Insight

“The KFD2-SR2-EX2.2S offers a robust solution for intrinsic safety with two independent channels. The reinforced isolation and SIL 2 capability make it a preferred choice for critical process applications. Its DIP switch configuration reduces setup time, and the line fault detection adds an extra layer of diagnostic security. We recommend this amplifier for projects that demand high reliability and simple integration.”

Frequently Asked Questions (FAQ)

• What is the supply voltage range?
  20 to 30 V DC, with max. 10% ripple.
• How do I set the switching behavior?
  Use the DIP switches on the front panel. No software needed.
• Can I use this in Zone 0?
  Yes, the input circuit is EEx ia IIC and certified for Zone 0/1/2.
• What is the maximum switching frequency?
  10 Hz (minimum pulse/pause ratio 20 ms).
• Does it have line fault detection?
  Yes, it detects sensor breakage (≤0.1 mA) and short-circuit (>6 mA).
• Are the outputs galvanically isolated?
  Input to output is reinforced insulated (300 Veff). Output to power supply is basic insulated.
• Which certificate does it carry?
  PTB 00 ATEX 2083 and IECEx TUN 19.0013X, plus FM and CSA approvals.
• What is the mechanical life of the relays?
  10⁸ switching cycles.

Selection Guide

Choose this amplifier when you need two independent relay outputs and SIL 2 functionality. For single-channel applications, consider the KFD2-SR2-EX1.W. For higher output current, use an external relay. Ensure the sensor’s NAMUR characteristics match the switching thresholds. Always verify the ambient temperature and enclosure rating for your installation site. Contact our technical support for detailed application assistance.

Delivery & Support

• Package Contents: KFD2-SR2-EX2.2S amplifier, terminal labels, and mounting instructions.
• Warranty: 12 months against manufacturing defects.
• Shipping: Orders placed before 2 PM ship same day. Delivery via FedEx, UPS, or DHL (12-24 hours for most regions).
• Contact: For inquiries, email sales@powergearx.com or call +86 18030005825 (WhatsApp).

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