The KEYENCE FS-V31P is a compact fiber optic sensor amplifier in the FS-V30 series, built for fast, stable detection in automated machinery. As a PNP single-output main unit with an integrated cable, it ensures dependable switching for presence/absence, edge and mark detection in packaging, electronics assembly and general machine building. The dual digital display supports quick setup and clear status feedback directly at the amplifier.

Engineered for performance and flexibility, the FS-V31P provides selectable response modes from 33 µs to 16 ms to balance high speed with high stability. LIGHT-ON/DARK-ON selection, automatic sensitivity tracking with area detection, and comprehensive timers (ON delay, OFF delay, one-shot and combinations, 0.1 ms to 9.999 ms) streamline optimization. The red 4-element 640 nm LED delivers strong signal levels, interference prevention enables multi-amplifier installations, and up to 16 expansion heads can be added for a total of 17 units. With a 12 to 24 VDC ±10% supply range, external input support, and robust immunity to ambient light up to 30,000 lux, temperature, vibration and shock, it integrates cleanly into industrial control panels.

On conveyors, pick-and-place stations or packaging lines, this amplifier shortens commissioning and ensures reliable fiber optic detection with clear feedback from the dual 7-segment indicators; it is a solid choice for OEMs and maintenance teams standardizing on a high-speed PNP solution, and it is backed by a 1-year warranty for added assurance throughout its service life.

• Brand: KEYENCE
• Series: FS-V30
• Model: FS-V31P
• Output type: PNP, 1 output
• Supply voltage: 12 to 24 VDC ±10%
• Response time: 33 µs to 16 ms (selectable)
• Light source: Red 4-element LED, 640 nm
• Connection type: Integrated cable