Pepperl+Fuchs KFDO-TR-EX1

Technical & Electrical Specifications

• Loop Powered Supply Voltage Range: 12 V DC ~ 35 V DC
• Module Static Power Dissipation: 0.4 W
• Field RTD Input Terminals: Terminals 1,2-,3+
• Supported Sensor Wiring: 2-wire Pt100 / 3-wire Pt100
• Maximum Permissible Lead Resistance Per Wire: 100 Ω
• Internal RTD Measuring Current: 1 mA constant
• Configurable Temperature Measurement Ranges (DIP Switch Selectable):
  1. Non-linearized: -200 °C ~ +800 °C
  2. Linearized standardized: -30 °C ~ +375 °C
• Control Side Analog Output Terminals: 8-,9+
• Standard Output Signal: 4 mA ~ 20 mA linear temperature proportional
• Fault Upscale Output Level: ≥ 22 mA upon sensor breakage
• Output Current Hard Limit: ≤ 35 mA
• Full Scale Measurement Accuracy: ±0.1% FS
• Temperature Drift Coefficient: 0.015% / K
• Supply Voltage Influence Error: 6.5 ppm / V
• Signal Response Rise Time: 250 ms
• Intrinsic Safety Certification: II (1)GD [EEx ia] IIC
• Intrinsic Safety Output Parameters (Field Side): Uo=16.1 V DC

Mechanical & Material Specifications

• Overall Dimension (W × H × D): 20 mm × 119 mm × 115 mm
• Housing Material: Flame-retardant green polycarbonate V0 self-extinguishing grade
• Protection Class: IP20 indoor cabinet installation only
• Mounting Standard: 35 mm EN 60715 DIN rail
• Connection Terminal Type: Screw clamp terminals
• Net Unit Weight: Approx. 150 g

Environmental Parameters

• Operating Ambient Temperature: -20 °C ~ +60 °C
• Storage Temperature Range: -30 °C ~ +75 °C
• Pollution Degree Class 2, Overvoltage Category II

Function Features

1. Single-channel dedicated Pt100 RTD signal acquisition for hazardous zone temperature sensors
2. DIP switch selectable linearized / non-linearized temperature output transfer characteristic
3. Automatic open RTD wire breakage detection with fixed 22 mA fault upscale output
4. Full galvanic isolation between hazardous field circuit and safe-area control loop
5. Loop-powered design eliminating separate dedicated 24 V DC power supply wiring
6. Certified Ex ia IIC intrinsic safety rating compatible with all gas hazardous zone classifications
7. Supports both 2-wire cost-effective and high-precision 3-wire RTD sensor topologies

Working Principle

Advantage Highlights

1. Loop-powered design reduces cabinet wiring quantity and power supply hardware count
2. Built-in temperature linearization eliminates external DCS software linearization configuration
3. Ex ia IIC universal gas hazard zone certification for all petrochemical hazardous area applications
4. Wide 12–35 V DC loop supply range compatible with all standard 4–20 mA control system cards
5. ±0.1% full-scale precision delivers high-accuracy industrial temperature measurement
6. Compact 20 mm single-channel DIN rail footprint optimizes cabinet space utilization

Applicable Industries

Installation Requirements

1. Install inside IP54+ sealed industrial electrical cabinets; horizontal DIN rail mounting only
2. All field-side RTD wiring strictly follow IEC 60079-14 intrinsic safety wiring standards
3. Separate hazardous field cables and safe-area control cables with physical internal cabinet partitions
4. Connect module output terminals directly to DCS/PLC analog input card loop supply circuit
5. Maintain minimum 10 mm vertical clearance above and below module for thermal heat dissipation

Usage Precautions

1. Maximum cumulative lead resistance per RTD wire must not exceed 100 Ω; use low-resistance shielded field cable for long sensor runs
2. Do not mix non-intrinsically safe wiring within same cable conduit as hazardous zone RTD wiring
3. Adjust DIP switch temperature range configuration only with full system power disconnected
4. For SIL safety temperature monitoring loops, perform quarterly accuracy calibration validation
5. Avoid mounting adjacent to high-power heat-generating modules without 15 mm spacing gap
6. Do not short-circuit field-side RTD terminals during live hazardous zone wiring maintenance