The Pepperl+Fuchs KFD2-GU-EX1 (P.N. 111197) is an intrinsically safe galvanic isolator designed for signal conditioning and isolation in hazardous areas.

1. General Information

• Manufacturer: Pepperl+Fuchs

• Model: KFD2-GU-EX1

• Part Number: 111197

• Type: Galvanic isolator with Ex-i (intrinsic safety) protection

• Primary Function: Signal isolation and conversion for 4–20 mA signals in hazardous areas

2. Certifications & Safety Approvals

• Hazardous Area Certifications:

  • ATEX/IECEx: Ex ia IIC T6 Ga (Gas) / Ex ia IIIC T85°C Da (Dust)

  • FM Approval: Class I, II, III, Division 1

  • CSA: Class I, Zone 0

• Safety Standards: Compliant with IEC 61508 (SIL 2/3 capable)

3. Electrical Specifications

• Input Signal: 4–20 mA (2-wire or 4-wire transmitters)

• Output Signal: 4–20 mA (galvanically isolated)

• Power Supply: 20–30V DC (typically 24V)

• Isolation: 1500V AC (input/output/power)

• Accuracy: ±0.1% of span

• Load Capacity: ≤ 500Ω (output loop resistance)

4. Environmental & Mechanical Specifications

• Operating Temperature: -20°C to +60°C

• Storage Temperature: -40°C to +85°C

• Humidity: 0–95% non-condensing

• Protection Rating: IP20 (for control cabinet mounting)

• Housing Material: Polycarbonate

• Dimensions: 17.5 x 116 x 121.5 mm (W x H x D)

• Mounting: DIN rail (35mm)

• Weight: Approx. 150g

5. Configuration & Indicators

• LED Indicators:

  • Green: Power ON

  • Yellow: Signal transmission

  • Red: Fault condition

• DIP Switches: Configurable for input type (2-wire/4-wire)

6. Applications

• Signal isolation in oil & gas, chemical, and pharmaceutical plants

• Intrinsically safe signal conditioning for pressure, flow, and level transmitters

• Process automation in hazardous (Ex) zones

• Intrinsic Safety Protection: It provides intrinsic safety barriers to protect sensitive electronics in hazardous locations (such as explosive environments).
• Signal Isolation: Used to isolate signals from field instruments like 4-20mA, 0-10V, and digital signals, preventing electrical faults from causing issues in the control system or field devices.
• Compact Design: A small, space-saving design that makes it ideal for mounting in control cabinets.
• Safety Standards Compliance: Typically complies with various international standards for hazardous locations, such as ATEX (for explosion protection) and UL certifications.
• Input/Output Configuration: The device may support input types like current (e.g., 4-20mA) and output types compatible with control systems like PLCs or DCS.
• Wide Temperature Range: Suitable for use in various industrial environments with a broad temperature range.
• Ex-rated Housing: Built to be used in environments that may have explosive atmospheres.