Panasonic EX-L291 Retroreflective Laser Sensor

Technical Overview

Ultra-compact retroreflective laser sensor with 4m sensing range, 0.5ms response, NPN output, and IP67 protection, ideal for precise industrial detection.

Key Features

Ultra-compact design with built-in amplifier
Long sensing range of 4 meters (with RF-330 reflector)
Fast response time of 0.5 ms or less
Visible red semiconductor laser (Class 1, 655nm, 0.5 mW max)
Sensitivity adjuster for fine-tuning
IP67 degree of protection against dust and water
Light-ON / Dark-ON selectable output operation
NPN open-collector transistor output
Operates on 12 to 24 V DC supply voltage
Includes RF-330 reflector (for EX-L291 variant)
Automatic interference prevention function for close mounting of two sensors
Low current consumption of 15 mA or less

Technical Specification Matrix

Parameter	Value
Sensor Type	Retroreflective Laser Sensor
Sensing Range	4 m (with RF-330 reflector)
Output Type	NPN Open-Collector
Supply Voltage	12 to 24 V DC ±10% (Ripple P-P 10% or less)
Current Consumption	15 mA or less
Response Time	0.5 ms or less
Protection Rating	IP67
Emitting Element	Red Semiconductor Laser (Class 1)
Wavelength	655 nm
Laser Output	0.5 mW max
Laser Beam Spot Size (at 1m)	Approx. 6 × 4 mm (Vertical x Horizontal)
Laser Beam Spot Size (at 4m)	H 18 × W 10 mm (Visual reference value)
Operating Temperature	-10 to +55 °C
Storage Temperature	-30 to +70 °C
Body Material	Polybutylene Terephthalate (Case), Acrylic (Front Cover), Glass (Lens)
Connection Type	Cabled (2m 4-core 0.15mm² cabtyre cable)
Output Operation	Light-ON / Dark-ON selectable
Minimum Sensing Object	Opaque/translucent object of ø25 mm or more
Repeatability (perpendicular to sensing axis)	0.2 mm or less
Short-circuit Protection	Incorporated
Sensitivity Adjuster	Continuously variable adjuster
Physical Weight (kg)	0
Dimensions L x W x H (cm)	2.34 x 1.2 x 0.82

Industrial Applications

1. High-Speed Small Part Detection on Production Lines

The EX-L291 is perfectly suited for reliably detecting small components on high-speed production lines, especially those with opaque or translucent properties, ensuring consistent product flow and quality control.

Problem Solved

Traditional sensors may struggle with the rapid detection of small or transparent objects, leading to missed parts or production stoppages. The EX-L291's 0.5 ms response time, precise 6x4mm laser spot (at 1m), and ability to detect objects ø25mm or larger provide accurate and rapid feedback for quality assurance and preventing jams.

high-speed detectionsmall objectretroreflective0.5ms response time6x4mm laser spotquality control

2. Precise Object Positioning in Automated Assembly Cells

This ultra-compact sensor is ideal for critical object positioning and verification tasks within automated assembly environments, where space is limited and high accuracy is paramount.

Problem Solved

Confined robotic work cells require miniature sensors that do not obstruct movement but still deliver high precision. The EX-L291's tiny dimensions (2.34 x 1.2 x 0.82 cm) combined with its 0.2 mm repeatability and sensitivity adjuster enable precise component placement and alignment, minimizing errors and improving assembly quality.

precision positioningcompact sensor0.2mm repeatabilitysensitivity adjustmentminiature designrobotic assembly

3. Material Flow Monitoring in Harsh Industrial Environments

The EX-L291 can be effectively deployed for monitoring material flow or presence detection in industrial zones characterized by dust, moisture, and varying temperatures.

Problem Solved

Standard sensors are prone to failure or reduced performance when exposed to harsh industrial conditions like high dust levels or washdowns. The EX-L291's robust IP67 protection rating and wide operating temperature range (-10 to +55°C) ensure reliable and consistent operation, extending sensor lifespan and reducing maintenance in challenging environments.

IP67dust and water protectionharsh environment-10 to +55°Cmaterial flowreliable presence detection