Panasonic LS-H21F Digital Laser Sensor Head

Technical Overview

Diffuse reflective laser sensor head with 30mm to 1000mm sensing, Class 2 red laser, adjustable spot, and IP40 protection for precise object detection.

Key Features

Diffuse-reflective sensing mode
Class 2 Red semiconductor laser (655 nm wavelength, 3 mW max output)
Sensing range adjustable from 30 mm to 1000 mm (U-LG mode)
Multi-turn adjuster for precise laser beam spot size control
Compact design optimized for side screw mounting
Requires external LS-400 series amplifier (sold separately)
IP40 protection rating for general industrial environments
Durable PBT enclosure with an acrylic lens cover
Equipped with Orange LED (operation) and Green LED (laser emission) indicators
Comes with a pre-wired 2m cable with fixed connector
Capable of detecting both opaque and translucent targets
FDA approved for safety and compliance

Technical Specification Matrix

Parameter	Value
Sensing Method	Diffuse Reflective (Spot Reflective)
Sensing Range (U-LG mode)	30 mm to 1000 mm
Sensing Range (STD mode)	30 mm to 500 mm
Sensing Range (FAST mode)	30 mm to 300 mm
Sensing Range (H-SP mode)	30 mm to 300 mm
Laser Class	Class 2 (FDA / IEC / EN / JIS)
Laser Type	Red Semiconductor Laser
Peak Emission Wavelength	655 nm
Max. Output	3 mW
Protection Rating	IP40 (IEC)
Ambient Temperature	-10 to +55 °C (+14 to +131 °F)
Storage Temperature	-20 to +70 °C
Ambient Humidity	35 to 85 % RH (No dew condensation or icing)
Storage Humidity	35 to 85 % RH
Ambient Illuminance	Incandescent light: 3,000 lx or less
Voltage Withstandability	1,000 V AC for 1 min
Insulation Resistance	20 MΩ or more (250 V DC megger)
Vibration Resistance	10 to 500 Hz, 1.5 mm double amplitude or 98 m/s² (X, Y, Z for 2 hours each)
Shock Resistance	98 m/s² (10 G approx.) in X, Y, Z directions (three times each)
Enclosure Material	PBT (Mounting part: PEI)
Lens Cover Material	Acrylic
Cable Length	2 m
Beam Spot Size	ø0.2mm at 50mm to ø1mm at 1m
Physical Weight (kg)	0.03
Dimensions L x W x H (cm)	0 x 0 x 0

Industrial Applications

1. High-Precision Part Presence and Position Detection

Precisely detect the presence, orientation, and position of small to medium-sized components on automated assembly lines or conveyor systems, ensuring accurate feeding and quality control. The adjustable spot size allows customization for various part geometries.

Problem Solved

Replaces less precise or contact-based sensors, mitigating damage to delicate parts and providing reliable, non-contact detection of both opaque and translucent materials at distances up to 1 meter, improving assembly accuracy and speed.

Diffuse reflectiveClass 2 laserAdjustable spot30mm-1000mm sensingNon-contactObject detectionAutomated assemblyQuality control

2. Non-Contact Level Monitoring for Dry Goods

Monitor fill levels of dry, granular materials (e.g., plastic pellets, grains, small manufactured parts) in storage hoppers, silos, or bins, triggering alerts for replenishment or preventing overflow in manufacturing and packaging processes.

Problem Solved

Eliminates issues with contact-based level sensors that can contaminate materials or be damaged by aggressive granular flows. The sensor's 30mm-1000mm range and small laser spot accurately detect the material surface from above, providing reliable level data in environments suitable for IP40 protection.

Non-contact level sensingDiffuse reflective30mm-1000mm sensingDry bulk materialInventory managementProcess automationHopper levelBin level

3. Edge Guiding and Alignment for Web Materials

Maintain precise lateral alignment of continuous web materials such as paper, plastic film, or textiles during unwinding, processing, and rewinding operations. The adjustable laser spot can accurately track the material's edge.

Problem Solved

Prevents material waste and production defects caused by misaligned web materials. This compact, high-accuracy diffuse reflective laser sensor provides real-time, non-contact edge detection, feeding precise position data to a web guiding system to ensure consistent product quality and efficient material handling in environments compatible with its IP40 rating.

Edge detectionWeb guidingMaterial alignmentDiffuse reflectiveAdjustable spotNon-contactPrecision measurementConverting machinery