Keyence LR-X50C CMOS Laser Displacement Sensor — 50 mm Range, NPN Output, 1PC

KEYENCE · LR-X Series · CMOS Laser Sensor · 1PC · In Stock

The Keyence LR-X50C is an ultra-compact CMOS laser displacement sensor from the KEYENCE LR-X series, designed for high-accuracy distance, thickness, gap, and profile measurement on modern factory automation lines. With a 50 mm sensing range, a visible red semiconductor laser, and a C-suffix NPN output, the LR-X50C delivers sub-millimeter repeatability in a housing small enough to mount inside tight machine tooling. This listing is for one piece (1PC); KOEED also supports multi-piece and full-line BOM quantities.

Key Technical Specifications & Overview

The LR-X50C belongs to Keyence's LR-X family, which uses a multi-pixel CMOS receiver instead of a single photodiode. This design stabilises measurements on glossy, dark, or textured targets and supports both displacement and thickness modes from a single sensor head, which is the key differentiator against conventional triangulation photoelectric sensors that drift on shiny or transparent surfaces. The "C" suffix denotes the NPN output variant; PNP, analog 4-20 mA, and IO-Link versions exist in the broader LR-X lineup.

Application Scenarios & Where It Fits

The LR-X50C is engineered for non-contact precision measurement on production lines. Because the CMOS multi-pixel receiver tracks the full spot profile rather than a single intensity peak, it stays accurate on shiny metal, transparent film, dark rubber, and irregular surfaces where conventional photoelectric sensors drift. It is also commonly used as a low-cost alternative to a Keyence LK-G or CL-3000 confocal laser when only 50 mm of range is needed.

• Semiconductor wafer thickness and stage-gap measurement on automated process lines
• PCB and flat-panel gap / height inspection in SMT back-end processes
• Bottle fill-level and cap-seat detection in food & beverage packaging
• Tire, rubber, and paper caliper / thickness control
• Sheet-metal and stamped-part thickness verification in metal forming
• Automotive body-panel gap and flush measurement on robotic assembly cells
• AGV and AMR obstacle / target detection on servo-driven carts
• Edge detection and profile inspection in Modicon-controlled packaging lines
• General part-presence and stack-height verification on factory automation cells with mixed-brand PLC racks

Integration & Wiring Notes

The "C" suffix on LR-X50C indicates the NPN output variant. Wire the brown lead to +24 V DC, blue to 0 V, black to the NPN load (sinking into the PLC input or relay coil), and white to the digital input channel that will read the switching state. If your PLC expects a PNP (sourcing) signal, choose the LR-X50CPN variant or pair the head with a Keyence LR-X series amplifier that supports polarity selection.

For closed-loop thickness control, the LR-X family also offers 4-20 mA variants that feed directly into the analog input cards of an Allen-Bradley CompactLogix 1769-IF8, a Siemens SIMATIC S7-1200 SM 1234, or a Mitsubishi MELSEC iQ-R analog module. Use the PLC Analog Calculator to map a 50 mm range to your engineering units, and the PLC Hex to Float Converter if your readings are returned as IEEE 754 words over Modbus.

Cable choice matters on long runs. Keep the M8 pigtail under 20 m where possible, route it away from VFD motor cables, and ground the sensor housing at the panel — not at the machine frame — to avoid ground-loop noise coupling into the CMOS receiver. If you need IO-Link diagnostics or remote threshold tuning, look at the LR-X50CI variant or pair the head with the Keyence LR-X amplifier and integrate via Modbus RTU or EtherNet/IP back to a master PLC.

Installation & Commissioning Tips

Mount the head perpendicular to the target within the rated 50 mm window. The visible red spot is your aiming reference; the on-head indicator turns solid green when the received light is inside the linear range. If you see it flashing or hunting, you are either too close, too far, or the target is specular — re-angle by 5 to 15 degrees to diffuse the reflection, or add a matte reference plate for first-article calibration.

During commissioning, run a five-point teach on a known reference target (a precision gauge block or shim stack) and store the near / far thresholds via the teach button or the IO-Link interface. For multi-station lines, KOEED can pre-configure amplifiers to your measurement window before shipping — just include the target distance and material in the RFQ to Moritta@KOEED.COM. If you are unsure which amplifier or I/O card to pair, the AI Diagnostic Tool on the KOEED site can cross-reference a photo of your existing rack in seconds.

Routine maintenance is minimal. The IP67 head tolerates washdown, but avoid high-pressure jets aimed straight at the lens — they can drive moisture past the seal. Wipe the lens with isopropyl alcohol and a lint-free swab monthly, and re-verify the taught threshold on the same reference target every six months or after any mechanical impact. If the sensor stops responding mid-cycle, check the PLC Error Code Database for a fast diagnosis before replacing the head.

Procurement, Warranty & Lead Time

KOEED sources the LR-X50C through established Keyence distribution channels. Genuine parts only — every sensor is inspected, sealed, and shipped in its original Keyence packaging with traceability documents on request. We support both single-piece purchases (this listing is for 1PC) and full-line BOM quantities for new line build-out or legacy refurbishment. KOEED is an independent multi-brand distributor and is not affiliated with Keyence Corporation.

Send a single-line RFQ for the LR-X50C or a multi-line BOM covering Allen-Bradley ControlLogix, Siemens SIMATIC, Mitsubishi MELSEC, Omron SYSMAC, Fanuc CNC, Schneider Modicon, Yaskawa servo drives, Panasonic FP PLCs, and KEYENCE vision systems to Moritta@KOEED.COM — we quote the entire list within 24 hours on business days. Browse the full brand index at the KOEED Brands hub or check the Daily PLC News for the latest Keyence firmware and EOL notices. Worldwide shipping is standard, with DHL, FedEx, and UPS options for urgent rebuilds.

Standard lead time for an in-stock LR-X50C is 1 to 3 business days to most major ports. Hard-to-find Keyence catalog numbers, EOL amplifier variants, and discontinued LR-Z / IB series sensors are also available — list them in the same RFQ and KOEED will confirm availability, lead time, and warranty terms in the same reply. Use the Create a Quote form for a structured submission, or simply reply to the auto-confirmation after sending a part list to Moritta@KOEED.COM. For visual confirmation of stock and packing, the KOEED Gallery shows recent Keyence shipments, and the Real-Time Sales Records page logs live outbound orders by destination.