Product Description

​The Pepperl+Fuchs KFD2-STC5-Ex1.2O is a SMART transmitter power supply and signal splitter designed for industrial applications requiring intrinsic safety and functional isolation. It supports 2-wire and 3-wire SMART transmitters, as well as 2-wire SMART current sources, providing dual 4 mA to 20 mA outputs in both current sink and source configurations. The device operates with a 24 V DC supply and features terminals with test points for convenient diagnostics. Certified up to Safety Integrity Level (SIL) 2 according to IEC/EN 61508, it ensures reliable performance in safety-critical applications. ​

Technical Specifications

• Signal Type: Analog input​
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• Functional Safety:
• Safety Integrity Level (SIL): SIL 2​
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• Systematic Capability (SC): SC 3​
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• Supply:
• Connection: Power Rail or terminals 14+ and 15-​
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• Rated Voltage: 18 V DC to 30 V DC​
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• Power Dissipation: ≤ 1 W at maximum load​
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• Power Consumption: ≤ 1.7 W at maximum load​
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• Input:
• Connection: Terminals 1+, 2-, 3​
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• Input Signal: 4 mA to 20 mA​
• Open Circuit Voltage / Short-Circuit Current: Terminals 1+ and 3: 23 V / 25 mA​
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• Input Resistance: Max. 265 Ω between terminals 2- and 3; max. 330 Ω between terminals 1+ and 3​
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• Available Voltage: ≥ 16 V at 20 mA; ≥ 20 V at 4 mA between terminals 1+ and 3​
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• Output:
• Connection: Terminals 7+, 8-, 9-; 10+, 11-, 12- (sink); terminals 7-, 8+, 9+; 10-, 11+, 12+ (source)​
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• Load: 0 Ω to 600 Ω​
• Output Signal: 4 mA to 20 mA (overload > 25 mA)​
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• Ripple: Max. 50 µA RMS​
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• External Supply (Loop): 2 V DC to 30 V DC​
• Internal 250 Ω Resistor: Available at terminals 9 and 12 for load​
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• Transfer Characteristics:
• Deviation: ≤ 10 µA (including calibration, linearity, hysteresis, loads, and supply voltage fluctuations)​
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• Temperature Influence: ≤ 0.25 µA/K​
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• Frequency Range: 0 Hz to 7.5 kHz (-3 dB)​
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• Settling Time: 200 µs​
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• Rise/Fall Time: 100 µs​
• Galvanic Isolation:
• Output / Power Supply: Functional insulation with rated insulation voltage of 50 V AC​
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• Output / Output: Functional insulation with rated insulation voltage of 50 V AC​
• Indicators / Settings:
• Display Elements: LED​
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• Labeling: Space for labeling at the front​
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• Ambient Conditions:
• Ambient Temperature: -20 °C to 60 °C (-4 °F to 140 °F); extended range up to 70 °C (158 °F) with specific mounting conditions​
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• Mechanical Specifications:
• Degree of Protection: IP20​
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• Connection: Screw terminals​
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• Dimensions: 20 mm (W) x 124 mm (H) x 115 mm (D)​
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• Mounting: On 35 mm DIN rail according to EN 60715​
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• Hazardous Area Approvals:
• EU-Type Examination Certificate: CML 17 ATEX 2031X​
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• Marking: Ex-Hexagon II (1)G [Ex ia Ga] IIC; Ex-Hexagon II (1)D [Ex ia Da] IIIC; Ex-Hexagon I (M1) [Ex ia Ma] I​
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• Input: [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I​
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• Supply: Max. safe voltage of 250 V (rated voltage may be lower)​
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• Equipment: Various voltage, current, and power ratings at specific terminals​
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• Certificate: CML 17 ATEX 3030X​
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• Marking: Ex-Hexagon II 3G Ex ec IIC T4 Gc​
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• Galvanic Isolation: Safe electrical isolation with peak voltage of 375 V​
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• Directive Conformity: EN IEC 60079-0, EN 60079-7, EN 60079-11​