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The Pepperl+Fuchs KFU8-SR-Ex2.W is a 2-channel isolated barrier switch amplifier from the K-System, designed for intrinsic safety applications in hazardous areas. It transfers digital signals from NAMUR sensors or dry contact mechanical switches from the hazardous area to the safe area with relay contact output.
This device features line fault detection (LFD) for monitoring field circuit breakage and short-circuit conditions, and supports SIL 2 (SC 3) functional safety rating according to IEC/EN 61508, making it ideal for safety-critical applications.
Universal Power Supply: Operates on either 19-30V DC or 90-253V AC (50-60Hz), providing global compatibility with any control system without the need for a separate DC power supply.
Key Specifications
Model
KFU8-SR-Ex2.W
Brand
Pepperl+Fuchs
Product Type
Switch Amplifier / 2-Channel Isolated Barrier
Signal Type
Digital Input
Input Types
NAMUR (acc. to EN 60947-5-6) or Dry Contact
Output
Relay Contact Output (Form C changeover, 2 channels)
Suitable for safety-related applications in process industries
Line Fault Detection (LFD)
Monitors field circuit for wire breakage (I ≤ 0.1 mA) and short-circuit (I > 6 mA)
Provides diagnostic indication for preventive maintenance
Fault relay output for remote error indication
Flexible Input Options
Accepts NAMUR sensors (acc. to EN 60947-5-6) or dry contact mechanical switches
Open circuit voltage: approx. 8V DC / short-circuit current: approx. 8mA
Switching point: 1.2 ... 2.1 mA, hysteresis approx. 0.2 mA
Relay Output
Form C changeover relay contacts for versatile load switching
Mechanical life: 10⁷ switching cycles
Energized/De-energized delay: approx. 20 ms
Reinforced Galvanic Isolation
Reinforced insulation between input/output, input/power supply, output/power supply, and output/output
Rated insulation voltage: 300 Veff acc. to IEC/EN 61010-1
Safe electrical isolation acc. to IEC/EN 60079-11 (375V peak)
Easy Configuration
DIP switch configuration for easy setup — no software required
Space for labeling at the front for clear identification
LED indicators for operating status and fault conditions per NAMUR NE44
DIP Switch Configuration
Switch
Function
S1
Reverses normal output state (energized ↔ de-energized)
S2
Reverses output state for second channel
S3
Enables/disables Line Fault Detection (LFD)
Refer to the instruction manual for detailed configuration guidance.
Function Description
This isolated barrier is used for intrinsic safety applications. It transfers digital signals (NAMUR sensors/mechanical contacts) from a hazardous area to a safe area.
The proximity sensor or switch controls a form C changeover relay contact for the safe area load. The normal output state can be reversed using switches S1 and S2. Switch S3 is used to enable or disable line fault detection of the field circuit.
During an error condition, the relays revert to their de-energized state and the LEDs indicate the fault according to NAMUR NE44.
Applications
Industry
Application Examples
Oil & Gas
Level monitoring, flow control, valve position feedback in hazardous areas
Chemical / Pharmaceutical
Tank level measurement, reactor monitoring, process control
Power Generation
Turbine monitoring, boiler control, coal handling systems
Mining
Conveyor monitoring, equipment control in explosive atmospheres
Water/Wastewater
Pump control, level switching in potentially explosive environments
Food & Beverage
Process monitoring in solvent-handling areas
Typical Use Cases:
Intrinsic safety barriers for hazardous area sensors
NAMUR proximity sensor interfacing
Mechanical switch signal transfer from Zone 0/1/2 areas
Functional safety systems requiring SIL 2 rating
Remote status monitoring and fault detection
Wiring Connections
Terminal
Function
1+, 2+, 3-
Channel 1: Field side input (NAMUR or dry contact)
4+, 5+, 6-
Channel 2: Field side input (NAMUR or dry contact)
7, 8, 9
Output I: Signal relay (Form C changeover)
10, 11, 12
Output II: Signal relay (Form C changeover)
14, 15
Power supply: 19-30V DC or 90-253V AC
Certifications & Compliance
ATEX: FIDI 22 ATEX 0029X — II 3(1)G Ex ec nC [ia Ga] IIC T4 Gc
Pepperl+Fuchs K-System trusted in industrial safety worldwide
Comprehensive Certifications
ATEX, IECEx, UL, SIL2, CCC Ex, DNV — one product for global use
Wide Temperature Range
-40°C to 70°C for harsh environments
Fast Response
10 Hz switching frequency with 20 ms delay times
Need support? Contact us for:
Technical specifications and complete datasheets
Volume pricing and availability
Installation and wiring guidance
Functional safety documentation
Application engineering support
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Distributor/Wholesaler,Exporter,Seller,Manufacturer,Trading Company
Year Established:
2013
Total Annual:
2000000-5000000
Employee Number:
20~50
Ecer Certification：
Verified Supplier
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