Pepperl+Fuchs KFD2-SR2-EX2.W Two-Channel Switch Amplifier
A two-channel isolated barrier that transfers NAMUR-sensor or dry-contact states from hazardous to safe areas through relay outputs.
Key Information
key informationPepperl+Fuchs KFD2-SR2-EX2.W is a two-channel switch amplifier for intrinsically safe digital input circuits. Each field channel accepts a NAMUR sensor or dry contact and controls a relay contact on the safe-area side.
Mode of operation can be reversed independently for the two outputs. Line-fault detection can be enabled for the field circuits, with fault indication at the LEDs and relay outputs returning to the de-energized state.
The device can be powered from terminals or a Power Rail; Power Rail operation also makes the collective error message available to the system.
Functions
functionsSignal transfer
Carries two discrete field states across the intrinsic-safety boundary to relay outputs.
Output logic control
Allows each relay operating mode to be reversed for the required safe-state logic.
Power Rail integration
Supports centralized 24 V DC distribution and collective fault reporting through the Power Rail.
About IndustryParts
https://www.industryparts.com/Exact-model support for KFD2-SR2-EX2.W
IndustryParts keeps the complete KFD2-SR2-EX2.W identity, requested quantity and installed-system evidence together so the proposed supply can be compared with the actual application before dispatch.
Specifications
specificationsInstallation
installationConfirm the hazardous-area classification and entity parameters for both loops.
Document whether each input is a NAMUR sensor or a dry contact and include the required resistor network.
Set switches S1 and S2 for the intended output logic.
Set S3 for the approved line-fault-detection behavior and verify the Power Rail supply arrangement.
Prove both relay states and the de-energized fault response.
Test open-circuit and short-circuit indication before the loops are accepted for service.
Lifecycle
lifecycleBefore replacement
Record switch positions, terminal conductors and Power Rail use for both channels.
Like-for-like match
Keep the complete Ex2.W suffix; one- and two-channel relatives are not interchangeable by name alone.
Acceptance
Test normal transitions, reversed logic where used, LFD response and collective fault signaling.
FAQ
faqCan KFD2-SR2-EX2.W accept both NAMUR sensors and dry contacts?
Yes, but the dry-contact circuit must use the documented resistor arrangement when line-fault detection is required.
How should the two relay modes on KFD2-SR2-EX2.W be preserved?
Record S1 and S2 before removal and restore each channel independently; do not assume both outputs use the same logic.
What should be checked when KFD2-SR2-EX2.W uses Power Rail?
Confirm the 24 V DC rail feed, device engagement and the required collective error-message path.
What information prevents ordering the wrong KFD2-SR2 variant for KFD2-SR2-EX2.W?
Provide the complete Ex2.W label, two-channel wiring, switch settings, approvals and terminal photographs.
What belongs in the KFD2-SR2-EX2.W loop test?
Verify both input transitions, both relay outputs, lead-break and short-circuit indication, and the de-energized response during a fault.
