Panasonic LS-H901 Coaxial Retroreflective Laser Sensor Head

Technical Overview

Compact, amplifier-separated coaxial retroreflective laser sensor head with a Ø6mm spot, offering 2.5m sensing range and IP40 protection.

Key Features

Coaxial retro-reflective sensing method
Utilizes a Class 1 Red Semiconductor Laser Diode (660nm)
Sensing range configurable up to 2.5 meters (in HYPR mode)
Compact dimensions: W8 × H23 × D18 mm (excluding indicators)
IP40 protection rating (IEC)
Features an orange LED operation indicator
Constructed with a robust PBT enclosure, polycarbonate indicator cover, and glass beam-emitting/receiving surfaces
Requires a separate amplifier from the LS-500 series (e.g., LS-501(P), LS-501(P)-C2)
Equipped with a 2m long, 2-core two parallel shielded cable

Technical Specification Matrix

Parameter	Value
Minimum Operating Temperature	-10 °C
Maximum Operating Temperature	+55 °C
IP Rating	IP40 (IEC)
Sensing Method	Retroreflective, Coaxial
Sensing Distance	0.01 m to 2.5 m (with RF-330 reflector)
Light Source	Red Semiconductor Laser Diode (660 nm), Class 1 [IEC / EN / JIS / GB / KS / FDA]
Max. Laser Output	1 mW
Cable Length	2 m
Enclosure Material	PBT
Indicator Cover Material	Polycarbonate
Beam-emitting/Receiving Surfaces Material	Glass
Laser Beam Spot Size	Ø6 mm
Applicable Amplifiers	LS-501(P), LS-501(P)-C2 (LS-500 series amplifiers)
Physical Weight (kg)	0.05
Dimensions L x W x H (cm)	1.8 x 0.8 x 2.3

Industrial Applications

1. Precision Part Counting on Conveyor Belts

The LS-H901 can precisely detect and count small, irregularly shaped parts on a fast-moving conveyor belt due to its compact Ø6mm laser spot and quick response time when paired with an amplifier. Its 2.5m sensing range allows flexible positioning above the belt. The IP40 rating provides adequate protection in typical factory environments where dust or splashes are minimal.

Problem Solved

Accurate counting of small, high-volume production parts to ensure correct packaging and inventory management, minimizing errors and waste.

Small object detectionHigh-speed countingConveyor belt automationLaser sensor2.5m sensing rangeIP40

2. Edge Detection for Web Guiding Systems

In web guiding applications for materials like paper, film, or textiles, the LS-H901's coaxial retro-reflective sensing and precise Ø6mm laser spot can accurately detect and monitor the edge of the material. This ensures proper alignment and prevents material waste, even with translucent or transparent webs, within an operating temperature range of -10°C to +55°C.

Problem Solved

Maintaining precise alignment of continuous web materials during processing or winding, preventing material run-off and ensuring product quality.

Web guidingEdge detectionMaterial alignmentTranslucent material detectionCoaxial retro-reflectiveIndustrial automation

3. Positioning Verification in Robotic Assembly Cells

The compact size (W0.8 × H2.3 × D1.8 cm) of the LS-H901 allows it to be integrated into confined spaces within robotic end-effectors or fixtures. Its 1mW Class 1 laser output and 2.5m range enable non-contact verification of component presence or precise positioning during automated assembly tasks, even in environments with temperatures up to +55°C.

Problem Solved

Ensuring components are correctly positioned and present before robotic manipulation or fastening, reducing assembly errors and improving process reliability.

Robotic assemblyComponent presence detectionPrecision positioningCompact sensorLaser Class 1Non-contact sensing