Panasonic EX-28A Ultra-Compact Reflective Photoelectric Sensor

Technical Overview

Ultra-compact NPN reflective photoelectric sensor with 45-115mm sensing, 12-24VDC input, IP67 rating, and 0.5ms response time for precise industrial detection.

Key Features

Ultra-compact design for space-saving installations
Reflective sensing method with a range of 45 to 115 mm
NPN open-collector output with a maximum sink current of 50 mA
Wide supply voltage range of 12 to 24 V DC ±10%
High environmental protection rating of IP67 (IEC)
Equipped with operation (orange LED) and stability (green LED) indicators
Incorporated short-circuit protection for enhanced reliability
Durable enclosure made of polyethylene terephthalate and polyalylate lens
Fast response time of 0.5 ms or less
Continuously variable sensitivity adjuster for flexible application

Technical Specification Matrix

Parameter	Value
Sensor Type	Photoelectric
Sensing Method	Reflective, Diffuse / Narrow View Reflective
Sensing Range	45 to 115 mm
Output Configuration	NPN open-collector transistor
Max Sink Current	50 mA
Applied Output Voltage	30 V DC or less
Residual Output Voltage	2 V or less (at 50 mA), 1 V or less (at 16 mA)
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
Light Source	Red LED (modulated), 650 nm peak emission wavelength
Protection Rating	IP67 (IEC)
Operating Temperature	-25 to +55 °C
Storage Temperature	-30 to +70 °C
Ambient Humidity	35 to 85 % RH (Operating and Storage)
Ambient Illuminance	Incandescent light: 3,000 lx or less
Vibration Resistance	10 to 500 Hz, 3 mm double amplitude (20 G max.) for 2 hours each in X, Y, Z directions
Shock Resistance	500 m/s² (50 G approx.) 3 times each in X, Y, Z directions
Enclosure Material	Polyethylene terephthalate
Lens Material	Polyalylate
Cable Length	2 m (0.1 mm² 3-core cabtyre cable)
Cable Extension	Up to 50 m with 0.3 mm² or more cable
Physical Weight (kg)	0.02
Dimensions L x W x H (cm)	2.5 x 0.82 x 1.23

Industrial Applications

1. High-Speed Part Detection on Conveyor Belts

The Panasonic EX-28A's rapid 0.5 ms response time and precise 45-115mm reflective sensing range make it perfectly suited for detecting small, fast-moving components on automated production lines, ensuring accurate counting and preventing bottlenecks.

Problem Solved

Ensures reliable and accurate detection of rapidly moving parts, preventing missed counts or mispositioning, which is critical for quality control and throughput in high-speed manufacturing.

High-speed detectionConveyor automationPart counting0.5ms response time45-115mm sensing range

2. Object Presence Verification in Washdown Environments

With an IP67 protection rating, the EX-28A can withstand harsh industrial conditions, including exposure to dust and water, making it ideal for verifying the presence of products on packaging lines or in food processing areas requiring regular washdowns.

Problem Solved

Provides dependable object presence sensing in challenging environments where sensors are exposed to liquids or particulates, reducing sensor failures and maintaining operational continuity.

IP67WashdownHarsh environmentPresence sensingPackaging automationDust and water resistance

3. End-of-Travel Sensing for Robotic Grippers

The ultra-compact dimensions of 12.3 x 8.2 x 25 mm allow the EX-28A to be seamlessly integrated into miniature robotic grippers or compact actuators, providing precise end-of-travel feedback or confirming the successful grasping of small objects.

Problem Solved

Enables highly accurate positional feedback and control for robotic end-effectors and compact machinery where space is extremely limited, improving the precision of automated assembly and manipulation tasks.

Ultra-compactRobotic gripperEnd-of-travel sensingMiniature automationSpace-constrained12.3x8.2x25mm dimensions