PEPPERL+FUCHS KFD2-SL2-EX1.LK Solenoid Driver Isolated Barrier

Overview

The PEPPERL+FUCHS KFD2-SL2-EX1.LK is a single-channel intrinsic safety solenoid driver isolated barrier from Pepperl+Fuchs K-system. The PEPPERL+FUCHS KFD2-SL2-EX1.LK receives logic control signals from the safe side DCS or PLC and provides intrinsically safe power output to drive solenoid valves, indicator lamps and audible alarms installed in hazardous zones. It supports line fault detection and relay collective fault output, and meets SIL 2 functional safety requirements. The PEPPERL+FUCHS KFD2-SL2-EX1.LK is widely stocked as spare part for safety instrumented systems in chemical, oil and gas plants.

Features

The PEPPERL+FUCHS KFD2-SL2-EX1.LK delivers 45mA rated output current at 11.2V DC for field solenoid devices. It adopts non-polarized logic input and consumes only around 3mA input current for reliable control signal recognition. The PEPPERL+FUCHS KFD2-SL2-EX1.LK integrates line fault detection function to identify wire breakage and short circuit on field cables, with LED status indicator and relay alarm contact output. It can be powered via the K-system power rail or terminal power supply, and carries ATEX and IECEx hazardous area certifications. The PEPPERL+FUCHS KFD2-SL2-EX1.LK uses standard DIN rail mounting and pin definition for direct drop-in replacement.

Specs

Device Type: Solenoid driver isolated barrier Model: PEPPERL+FUCHS KFD2-SL2-EX1.LK Channel: 1 channel Output: 45mA, 11.2V DC intrinsically safe output Safety Level: SIL 2 according to IEC 61508 Input: Non-polarized logic input Power Supply: 19V DC to 30V DC Diagnosis: Line fault detection, LED indication, relay fault contact Mounting: 35mm DIN rail mount Protection Grade: IP20 Application: Intrinsic safety loop, hazardous area solenoid valve control, SIS safety system

Principle

The PEPPERL+FUCHS KFD2-SL2-EX1.LK judges the on/off state of the logic signal from the control system. When the input signal is active, the internal safety circuit outputs limited current and voltage to the field solenoid actuator. The barrier continuously monitors the impedance of the field circuit. If the cable impedance exceeds 10kΩ for open circuit or falls below 50Ω for short circuit, the PEPPERL+FUCHS KFD2-SL2-EX1.LK triggers fault indication and closes the collective alarm relay to send fault message to the host safety system.

Applications

The PEPPERL+FUCHS KFD2-SL2-EX1.LK is used for solenoid valve driving in emergency shutdown systems and burner management systems. It serves alarm horn and status light control in explosive chemical and petrochemical process areas. The PEPPERL+FUCHS KFD2-SL2-EX1.LK applies to spare stock and emergency repair of existing Pepperl+Fuchs K-system safety barriers. It also supports new safety loop construction and hazardous area instrument cabinet retrofitting.