Panasonic EX-L291-P-J Laser Retroreflective Sensor

Technical Overview

Ultra-compact (23.4x12x8.2mm) Class 1 laser retroreflective sensor with 4m sensing range, 0.5ms response, PNP output, and IP67 protection.

Key Features

Ultra-compact miniature body dimensions: 23.4 x 12 x 8.2 mm.
Long sensing range of 4 meters (with RF-330 reflector).
High-speed response time of 0.5 ms or less.
PNP open-collector transistor output.
Light-ON / Dark-ON selectable output operation.
Built-in short-circuit and inverse polarity protection.
IP67 degree of protection (IEC).
Class 1 Red semiconductor laser (655 nm wavelength).
Continuously variable sensitivity adjuster.
Automatic interference prevention function allows close mounting of multiple sensors.
Wide operating temperature range of -10 to +55 ℃.
Includes RF-330 reflector.

Technical Specification Matrix

Parameter	Value
Sensor Type	Laser Photoelectric, Retroreflective
Sensing Range	4 m
Supply Voltage	12 to 24 V DC ±10% (Ripple P-P 10% or less)
Current Consumption	15 mA or less
Output Type	PNP Open-Collector Transistor
Max Output Current	50 mA
Response Time	0.5 ms or less
Protection Rating	IP67 (IEC)
Operating Temperature	-10 to +55 ℃
Storage Temperature	-30 to +70 ℃
Ambient Humidity	35 to 85 % RH
Light Source	Red Semiconductor Laser (Class 1)
Wavelength	655 nm
Emission Spot Size (at 1m)	Approx. 6 × 4 mm (vertical x horizontal)
Emission Spot Size (at 4m)	H 18 x W 10 mm
Sensing Object	Opaque translucent object of ø25 mm or more
Hysteresis	20% or less of operation distance
Repeatability (Perpendicular to sensing axis)	0.2 mm or less
Body Material	Polybutylene Terephthalate (Case), Acrylic (Front Cover), Glass (Lens)
Connection Type	Cables (2m, 4-core, 0.15mm² cabtyre cable)
Physical Weight (kg)	0.05
Dimensions L x W x H (cm)	2.34 x 1.2 x 0.82

Industrial Applications

1. High-Speed Object Counting on Conveyor Belts

This sensor can accurately count small to medium-sized objects moving rapidly on a conveyor belt in manufacturing or packaging lines. Its ultra-compact size allows for easy integration into existing machinery with limited space.

Problem Solved

Traditional bulkier sensors might miss fast-moving objects or be difficult to install in tight spaces. The 0.5 ms response time ensures no object is missed, and the 4m range allows flexibility in mounting. The compact size (2.34 cm length, 1.2 cm width, 0.82 cm height) ensures it fits in constrained areas.

High-speed detectionObject countingConveyor automationCompact integrationRapid responseManufacturing efficiency

2. Presence/Absence Detection in Robotics and Automated Assembly

Due to its small form factor and 4m sensing range, the EX-L291-P-J is ideal for detecting the presence or absence of components during robotic pick-and-place operations or automated assembly processes where precise part verification is critical. The Class 1 laser ensures accurate targeting.

Problem Solved

Ensuring components are correctly positioned or present before a robotic arm proceeds, preventing errors and material waste. The miniature design avoids interference with robot movement, and its IP67 rating protects against dust and splashes, common in assembly environments.

Robotic automationComponent verificationAssembly linePrecise positioningPresence detectionLaser guidance

3. Material Handling and Pallet Detection in Warehousing

In automated warehouses, this sensor can be used for reliable detection of pallets or larger containers on automated guided vehicles (AGVs) or storage racks. The 4m retroreflective range is suitable for typical aisle widths, and IP67 ensures durability in dusty or occasionally damp environments.

Problem Solved

Preventing collisions between AGVs and obstacles, ensuring correct pallet placement, and managing inventory flow. Its robust IP67 rating makes it suitable for demanding warehouse conditions with varying temperatures (-10 to +55 ℃).

Automated guided vehicles (AGV)Warehouse automationPallet detectionMaterial flowCollision avoidanceInventory management