Panasonic EX-28B Reflective Photoelectric Sensor

Technical Overview

Ultra-compact, IP67 rated reflective photoelectric sensor with 45-115mm sensing range, 12-24VDC, NPN output, and 0.5ms response time.

Key Features

Ultra-compact design for space-constrained applications.
Narrow-view reflective sensing method with a range of 45 to 115 mm.
IP67 protection rating for harsh industrial environments.
Red LED dot light source ensures a clear beam spot for easy alignment.
Built-in amplifier for simplified integration.
NPN open-collector transistor output with Dark-ON operation.
Incorporates a sensitivity adjuster for fine-tuning.
Fast response time of 0.5 ms or less.
Low current consumption of 15 mA or less.
Integrated inverter countermeasure circuit for improved stability.
RoHS compliant for environmental safety.

Technical Specification Matrix

Parameter	Value
Supply Voltage	12 to 24 V DC ± 10 % Ripple P-P 10 % or less
Current Consumption	15 mA or less
IP Rating	IP67 (IEC)
Sensing Method	Reflective, Narrow-view (Long distance spot beam type)
Sensing Distance	45 to 115 mm
Light Source	Red LED (dot light source)
Output Configuration	NPN open-collector transistor, Dark-ON
Maximum Sink Current	50 mA
Applied Output Voltage	30 V DC or less (between output and 0 V)
Residual Output Voltage	2 V or less (at 50 mA sink current), 1 V or less (at 16 mA sink current)
Response Time	0.5 ms or less
Operating Temperature	-25 to +55 degrees Celsius
Storage Temperature	-30 to +70 degrees Celsius
Ambient Humidity	35 to 85 % RH (Operating and Storage)
Cable Length	2 m
Physical Weight (kg)	0
Dimensions L x W x H (cm)	2.5 x 0.82 x 1.23

Industrial Applications

1. Small Part Detection in Automated Assembly Lines

The EX-28B's narrow-view reflective sensing and 45-115mm range, combined with a precise red LED dot light source, make it ideal for accurately detecting small opaque, translucent, or transparent objects on conveyor belts or within confined spaces, such as chip components or wafer protrusions.

Problem Solved

Ensures precise and reliable detection of miniature components, preventing assembly errors and improving throughput in high-speed manufacturing processes.

Small object detectionPrecision sensingAssembly automationCompact footprint

2. Material Handling in Wet or Dusty Environments

With an IP67 protection rating, the sensor is highly resistant to water and dust ingress, allowing for reliable operation in challenging industrial environments such as food processing, bottling plants, or dusty packaging lines. Its 12-24VDC supply voltage is standard for industrial control systems.

Problem Solved

Maintains consistent performance and extends sensor lifespan in environments exposed to moisture, washdowns, or airborne particulates, reducing maintenance and downtime.

IP67Harsh environmentsMaterial handlingWet area sensing

3. Presence/Absence Verification in Compact Machinery

The ultra-compact dimensions (2.5 x 0.82 x 1.23 cm) and sensitivity adjuster allow the EX-28B to be seamlessly integrated into machinery with limited space, providing accurate presence/absence verification for components, covers, or tooling within a short sensing distance of 45-115mm.

Problem Solved

Enables reliable operational checks and safety interlocks in miniature equipment without requiring extensive space modifications, ensuring process integrity and operator safety.

Space-saving designPresence sensingCompact machineryPosition detection