Keyence LV-S71 Small Standard Sensor Head

Keyence LV-S71 Thrubeam Laser Sensor Head

Product Introduction

The LV-S71 belongs to the Keyence LV-S ultra-small sensor head family. This thrubeam spot type model serves small standard detection applications. Its visible red semiconductor laser runs at 655 nm and carries Class 1 certification under FDA CDRH Part 1040.10 and IEC 60825-1. Engineers commonly deploy it on small part counting, edge detection, and presence sensing stations. The sensor head itself has no built-in ports. Instead, it connects to an LV-N series amplifier through a dedicated cable. Power, signal output, and threshold tuning all pass through the amplifier unit.

Technical Specifications

The optical design of the LV-S71 centers on a thrubeam spot-type configuration. Specifically, the 655 nm visible red laser simplifies alignment between the emitter and receiver during commissioning. A detecting distance of 500 mm applies across all modes, which supports consistent setup on small work cells. Meanwhile, the Class 1 laser classification removes the need for safety barriers and operator eyewear in normal use.

The sensing head carries no communication ports or protocols. This design choice keeps the unit small and rugged. All configuration happens on the LV-N amplifier. Therefore, users tune sensitivity and output mode at the amplifier, not at the head.

Mechanical and Environmental Parameters

The glass reinforced plastic housing balances rigidity and low weight. At roughly 70 g, the head adds little load to mounting brackets. Operating temperature ranges from -10 to +50 °C with no freezing allowed. Installers should shield the unit from direct heat sources and condensation. Relative humidity and protection rating data are not published for this model. Consequently, buyers should confirm IP requirements against the amplifier enclosure and cabinet design. The LV-S71 suits indoor industrial environments such as assembly cells and small part handling lines.

Installation Guide

First, mount the emitter and receiver on rigid brackets facing each other. Keep the beam path clear of vibrating panels and moving guards. Next, connect the dedicated cables to the LV-N amplifier and tighten the connectors. Power comes from the amplifier, so no separate supply wiring is needed at the head. After that, power on the amplifier and align the emitter spot with the receiver aperture. Then fine-tune the threshold until the indicator stabilizes.

For small targets, teach the amplifier with the object present and absent. This two-point teach routine improves detection repeatability on tiny parts. Besides, route the cable away from motor drives and inverter output lines to reduce noise. Finally, record the final settings and lock the amplifier to prevent accidental changes.

Packaging List

• 1 × Keyence LV-S71 sensor head

• 1 × Dedicated connection cable

• 1 × Mounting bracket and screws

• 1 × Protective packaging

Shipping

Orders ship via Fedex, UPS, DHL. Stock items usually leave the warehouse within 1–2 business days after payment confirmation.

FAQ

Q1: What is the detecting distance of the LV-S71?
A: The LV-S71 provides 500 mm across all modes, so range stays constant regardless of mode selection.

Q2: Does the sensor head work without an LV-N amplifier?
A: No. The head draws power and sends signals through the LV-N amplifier via its dedicated cable.

Q3: Is the laser safe for open production areas?
A: Yes. It is a Class 1 laser product under IEC 60825-1 and FDA CDRH Part 1040.10.

Q4: What targets suit the thrubeam design best?
A: The thrubeam design suits small part counting, edge detection, and precise presence sensing.

Q5: What is the operating temperature range?
A: The LV-S71 operates from -10 to +50 °C. Avoid condensation on the lens.