KFD2-SCD2-Ex2.LK | Pepperl+Fuchs SMART Current Driver

This 2-channel isolated barrier drives current outputs up to 650 Ω load. It supports HART-IP and valve positioners with high accuracy.

Product Description

The KFD2-SCD2-Ex2.LK is a SMART current driver from Pepperl+Fuchs. It provides two independent analog output channels. Each channel delivers 4-20 mA signals to field devices. The unit features line fault detection (LFD) for breakage and short-circuit monitoring. It achieves SIL 2 (SC 3) for functional safety applications. The device mounts on a 35 mm DIN rail. It operates from a 19-30 V DC supply via Power Rail or terminals.

Technical Specifications

• Brand: Pepperl+Fuchs
• Model: KFD2-SCD2-Ex2.LK
• Type: 2-channel isolated barrier / SMART current driver
• Supply Voltage: 19 … 30 V DC (Power Rail or terminals 14+, 15-)
• Rated Current: ≤ 45 mA at 24 V
• Power Dissipation: ≤ 1 W at 20 mA / 500 Ω load
• Input Signal: 4 … 20 mA (limited to approx. 30 mA)
• Output Current: 4 … 20 mA
• Load Range: 100 … 650 Ω (terminals 1,2 / 4,5)
• Voltage Output: ≥ 13 V at 20 mA
• Accuracy: < 0.1 % of full scale at 20 °C
• Temperature Influence: < 2 µA/K (-20 … 70 °C)
• Rise Time: 10 to 90 % ≤ 10 ms
• Frequency Range: 0 … 3 kHz (-3 dB) for both directions
• Line Fault Detection: Breakage (>100 kΩ) and short-circuit (<50 Ω)
• Galvanic Isolation: Input/Output basic insulation 300 Vrms
• Ambient Temperature: -40 … 70 °C
• Protection Class: IP20
• Dimensions: 20 x 124 x 115 mm (W x H x D), housing B2
• Weight: approx. 135 g

Core Performance Indicators

• Accuracy: 0.1 % full scale
• Linearity: High precision across 4-20 mA range
• Resolution: Fine current steps for precise control
• Temperature Range: -40 to 70 °C
• Environmental Resistance: Withstands industrial vibration and humidity
• Interference Immunity: EN 61326-1 (industrial locations)
• Response Time: Fast rise time ≤ 10 ms

Installation & Setup

• Mount on 35 mm DIN rail per EN 60715
• Connect power via Power Rail or terminals 14+/15-
• Wire input signals to terminals 7-/8+ (or 10-/11+)
• Connect field devices to terminals 1+/2- (or 4+/5-)
• Use terminals 3/6 for load without short-circuit detection
• Set DIP switches for HART or valve positioner modes

Maintenance & Service

• LED indicators show channel status and faults
• LFD alerts for wire breakage or short circuits
• Front label space for easy identification
• No periodic calibration required
• Use front adhesive label for channel marking

Compatibility & Certifications

• HART-IP and valve positioner compatible
• SIL 2 (SC 3) per IEC/EN 61508
• ATEX: [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I
• IECEx: [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I
• UL approval E106378
• Ex ec IIC T4 Gc for Zone 2
• NE 21 and EN 61326-3-2 compliant

Package Contents

• 1 x KFD2-SCD2-Ex2.LK isolated barrier
• 1 x front label sheet
• 1 x installation manual
• No mounting accessories needed (DIN rail clip built-in)

Warranty & Shipping

• Warranty: 12 months from purchase date
• Dispatch: Ships within 12-24 hours
• Carriers: FedEx, UPS, DHL
• Tracking number provided after shipment

Manager’s Insight

“This barrier is a workhorse for safe signal transmission. Its dual channels save panel space. The LFD feature prevents costly process downtime. SIL 2 rating gives confidence for safety loops. A smart choice for Ex-rated installations.”

Expert Review

Engineers appreciate the HART-IP support and fast response. The 0.1% accuracy ensures reliable process readings. The device handles 650 Ω loads easily. Overall, it delivers robust performance in hazardous areas.

Applications

• Oil & gas refineries
• Chemical plants
• Pharmaceutical production
• Water treatment facilities
• Power generation stations
• Valve positioner control
• HART-enabled field devices

Frequently Asked Questions

What is the maximum load resistance for this output?

650 Ω for terminals 1/2 and 4/5.

Does it support HART communication?

Yes, HART-IP protocol is fully supported.

What does the LFD function detect?

Wire breakage (>100 kΩ) and short-circuit (<50 Ω).

Can I power this unit via Power Rail?

Yes, Power Rail connection is standard.

Is this device SIL rated?

Yes, SIL 2 (SC 3) per IEC/EN 61508.

What is the operating temperature range?

-40 to 70 °C (-40 to 158 °F).

Does it work with valve positioners?

Yes, it supports valve positioner applications.

What certification does it have for Ex areas?

ATEX and IECEx for Zone 0, 1, 2 and mining.

How do I connect the field wiring?

Use terminals 1+/2- or 4+/5- with short-circuit detection.

Is the unit pluggable?

No, it uses screw terminals for permanent wiring.

Selection Guide

Choose this model if you need two isolated current outputs. It suits applications with HART or valve positioners. For single-channel needs, consider KFD0-SCD-Ex1. If you don’t need Ex protection, select non-Ex variants. Always check load and voltage requirements before ordering.

Product Comparisons

• KFD0-SCD-Ex1 – Single-channel version, same performance
• KFD2-STC4-Ex2 – Temperature converter, different function
• KFD2-SCD2-Ex2.LK – This model with HART-IP and LFD

Contact & Support

For inquiries, email sales@powergearx.com or call +86 18030005825 (WhatsApp).

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