Technical Overview

1-channel isolated barrier repeater for intrinsic safety, 24 VDC loop-powered, SMART fire alarm input, 1-20mA, up to SIL 2, IP20.

Key Features

1-channel isolated barrier
24 V DC supply (loop powered)
SMART fire alarm input
Current input 1 mA ... 20 mA
Up to SIL 2 acc. to IEC/EN 61508
IP20 protection rating
DIN rail mounting
Screw terminals for reliable connectivity
Safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Transfers digital signals superimposed on analog values bidirectionally

Technical Specification Matrix

Parameter	Value
Signal Type	Analog input
Safety Integrity Level (SIL)	SIL 2 acc. to IEC/EN 61508
Rated Voltage	24 V DC, loop powered
Power Dissipation	< 0.2 W for Uin = 24 V, Iout = 20 mA
Control Circuit Voltage	0 - 24 VDC, 0-20 mA
Current Input	1 mA ... 20 mA
Short-circuit Current	≤ 65 mA
Transmission Range (Field Circuit)	Voltage: 4 ... 20 V DC/0 ... 6 Vpp AC; Current: 1 ... 20 mA
Electrical Isolation	Safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Ambient Temperature	-20 ... 60 °C (-4 ... 140 °F)
Degree of Protection	IP20
Physical Weight (kg)	0.1
Dimensions L x W x H (cm)	11.5 x 2 x 10.7

Industrial Applications

1. Fire and Gas Detection Systems in Petrochemical Plants

This isolated barrier interfaces SMART-compatible fire and smoke detectors in hazardous Zone 0, 1, or 2 areas of petrochemical facilities with safe area control systems. Its 1 mA to 20 mA current input and loop-powered design simplify wiring, while the intrinsic safety (EX rating) ensures operation in explosive atmospheres.

Problem Solved

Safely transfers critical fire and gas detection signals from hazardous zones to the safe control room, preventing ignition sources and ensuring operational safety in highly flammable environments, supported by its EX rating and 1-20mA input.

Intrinsically safehazardous areaZone 0/1/2SMART detectors1-20mAloop poweredfire & gas detectionpetrochemical

2. Process Control Signal Isolation in Pharmaceutical Manufacturing

In pharmaceutical facilities, precise analog signals from sensors (e.g., pH, temperature) in processing areas (potentially hazardous due to solvents) require isolated transmission to control systems. The KFD0-CS-EX1.54 provides a 1-channel, galvanically isolated interface for 1-20mA analog inputs, protecting the control system from faults and noise, and maintaining intrinsic safety in hazardous zones.

Problem Solved

Ensures accurate and isolated transmission of critical process variables from hazardous or noisy areas to control systems, enhancing signal integrity and operator safety, while complying with intrinsic safety requirements.

Galvanic isolationanalog input1-20mAprocess controlpharmaceutical manufacturingintrinsic safetysignal integrity

3. Remote Monitoring of Tank Levels in Fuel Storage Depots

This repeater connects a 1-channel analog level transmitter (e.g., 4-20mA output) in a hazardous fuel storage tank to a safe area SCADA or control system. Its loop-powered operation simplifies installation, and the SIL 2 rating provides a reliable safety function for critical level monitoring or overfill prevention.

Problem Solved

Provides intrinsically safe and reliable transmission of critical tank level data from hazardous fuel storage areas to monitoring systems, aiding in inventory management and preventing dangerous overfill conditions, supported by its 1-20mA input and SIL 2 rating.

Tank level monitoringfuel storageSCADA4-20mAanalog signalintrinsic safetySIL 2loop powered

Pepperl+Fuchs KFD0-CS-EX1.54 Isolated Barrier Repeater

Pepperl+Fuchs KFD0-CS-EX1.54 Isolated Barrier Repeater

Technical Overview

Key Features

Technical Specification Matrix

Industrial Applications

1. Fire and Gas Detection Systems in Petrochemical Plants

2. Process Control Signal Isolation in Pharmaceutical Manufacturing

3. Remote Monitoring of Tank Levels in Fuel Storage Depots