Panasonic LS-H91 Retroreflective Digital Laser Sensor

Technical Overview

Compact Panasonic LS-H91 coaxial retroreflective digital laser sensor head with a 0.1-7m range and Class 1 laser, suitable for precise indoor object detection.

Key Features

Coaxial retroreflective detection type.
Utilizes a Class 1 red semiconductor laser (Max. output: 1mW, Peak wavelength: 655nm).
Offers multiple sensing modes including U-LG, STD, FAST, and H-SP.
Requires an external amplifier unit (LS-401(P), LS-401(P)-C2, LS-403) for operation.
Designed for high-precision sensing applications.

Technical Specification Matrix

Parameter	Value
Sensing Range (U-LG mode)	0.1 to 7 m
Emitting Element	Red semiconductor laser, Class 1 (IEC/EN/JIS/GB/KS standard)
Maximum Output	1 mW or less
Peak Emission Wavelength	655 nm
Ambient Operating Temperature	-10 to +55 °C
Ambient Storage Temperature	-20 to +70 °C
Ambient Operating Humidity	35 to 85% RH (no dew condensation or icing)
Ambient Storage Humidity	35 to 85% RH
Enclosure Material	PBT (Attachment: PEI)
Lens Cover Material	Acrylic
Cable Length	2 m (0.1mm² shielded cable)
Vibration Resistance	10 to 500 Hz, 1.5 mm double amplitude or max. acceleration 98 m/s² (X, Y, Z direction for 2 hours each)
Dielectric Strength	1,000 V AC for one min
IP Rating	IP40
Physical Weight (kg)	0.03
Dimensions L x W x H (cm)	3.1 x 1.12 x 2.5

Industrial Applications

1. High-Precision Object Detection on Conveyor Belts in Packaging Facilities

The Panasonic LS-H91's coaxial retroreflective design and 0.1 to 7m sensing range, coupled with its compact size, make it ideal for accurately detecting small to medium-sized packages on conveyor systems. The Class 1 laser ensures safety in typical industrial environments where human interaction is possible.

Problem Solved

Ensures accurate package counting, positioning, and flow control, thereby reducing errors in automated packaging lines and improving throughput.

Object detectionRetroreflective sensorConveyor systemPackaging automationClass 1 laser7m sensing range

2. Part Presence/Absence Verification in Automated Assembly Cells

With its small dimensions (1.12 x 3.1 x 2.5 cm) and high precision, the LS-H91 can be integrated into confined spaces within automated assembly machinery. The reliable laser detection verifies the presence or absence of components during critical assembly steps.

Problem Solved

Prevents incorrect assembly or missing parts, significantly improving product quality and reducing rework requirements in automated manufacturing processes.

Part verificationAssembly automationMiniature sensorLaser presence detectionIndustrial robotics

3. Door/Gate Position Monitoring in Indoor Material Handling Systems

Given its IP40 rating (suitable for indoor, dust-protected environments) and a reliable 0.1 to 7m sensing range, this sensor can accurately monitor the open/closed status of industrial doors or safety gates in warehouses or production facilities. Its robust PBT enclosure ensures durability in such settings.

Problem Solved

Provides essential feedback for interlocking safety systems and optimizes material flow by confirming the precise position of gates and doors, enhancing operational safety and efficiency.

Safety gate monitoringIndustrial doorsMaterial handlingPosition sensingIP40