Pepperl+Fuchs KFD2-CRG2-EX1.D 255620 24VDC Supply Transmitter Power Supply

1. Overview of the Pepperl+Fuchs KFD2-CRG2-EX1.D 255620

The Pepperl+Fuchs KFD2-CRG2-EX1.D 255620 is a high-performance isolating safety barrier designed for harsh industrial environments. It integrates signal conditioning, isolation, and conversion, with the core mission of establishing a reliable and secure signal bridge between hazardous, explosive areas (Zones 1 and 21) and the safety of control rooms. This model, a classic from the world-leading Pepperl+Fuchs brand, is a key component in signal processing for process industries such as petrochemicals, pharmaceuticals, and energy, with its exceptional stability, accuracy, and safety.

2. Core Features:

Explosion-proof certifications: ATEX / IECEx Ex ia IIC T4 Ga; Ex ia IIIC T135°C Da
Power supply: 20…30 V DC (typically 24 V DC), power consumption: 2.5 W, losses: 2 W
Input: 0/4…20 mA, two-/three-wire transmitter or active current source
Input impedance: 45 Ω
Open-circuit voltage/short-circuit current: 24 V / 33 mA
Outputs I, II: 2 x SPDT relays, 250 V AC / 2 A or 40 V DC / 2 A, mechanical life: 5 x 10⁷ cycles
Output III: 0/4…20 mA, maximum 24 V DC, load: 0…650 Ω
Accuracy: Input: <30 µA; Output III: <20 µA
Temperature drift: Input: 30 ppm/K; Output: 50 ppm/K
Response time: <200 ms (relay); <650 ms (current output: 90 % of final value)
Fault signal: Complies with NAMUR NE43: Lower limit ≤3.6 mA, upper limit ≥21 mA
Insulation: Input/output/power supply: Reinforced insulation, 300 Veff
EMC: EN 61326-1:2013 (Industrial)
Environment: –20…+60°C; Humidity: 5…95% RH, non-condensing
Protection: IP20
Mounting: 35 mm DIN rail (EN 60715)
Terminals: Screw-type, 0.2…2.5 mm²
Dimensions/Weight: 40 × 119 × 115 mm (W×H×D) / Approximately 300 g

Transmitter power supply: Provides loop power of ≥15 V, 0/4…20 mA to hazardous area transmitters.
Signal isolation: Input, output, and power supply are fully isolated, with a withstand voltage of 300 Veff.
Dual Relay Alarm: Two sets of SPDT relays, configurable for high/low alarm, window alarm, and fault alarm.
Current Retransmission: A third active 0/4…20 mA output with a maximum load of 650 Ω and adjustable range and direction.
Linearization: Supports 20-point linearization correction, compatible with various nonlinear sensors.
Line Fault Detection: Automatically identifies open (<0.2 mA) or short (>22 mA) inputs, providing notification via LEDs and a collective fault bus.
Configuration:
Front panel with 3 buttons + LCD menu
PC software: PACTware + infrared interface
Delay: Relay activation/deactivation delays are adjustable from 0…250 s to suppress process fluctuations.
SIL 2 Certification: Suitable for safety interlock systems up to Safety Integrity Level 2.

3. Product details pictures

4. Related products

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