Panasonic EX-21B Ultra-Compact Photoelectric Sensor

USD 66.24

Ultra-compact 4.5mm thick thru-beam photoelectric sensor with 1m range, 0.5ms response, and IP67 protection for precise object detection.

SKU Pananonic-EX-21B Category
Top Brands > Panasonic > Panasonic Photoelectric Sensors

Panasonic EX-21B Ultra-Compact Photoelectric Sensor

Model Identifier EX-21B
Official Part Number EX-21B
GTIN Standard NA

Technical Overview

Ultra-compact 4.5mm thick thru-beam photoelectric sensor with 1m range, 0.5ms response, and IP67 protection for precise object detection.

Key Features

  • Ultra-compact and miniature design (4.5mm thick, H18 x W16 mm).
  • Thru-beam sensing method for reliable detection.
  • 1 meter sensing range for versatile applications.
  • Detects opaque objects with a minimum diameter of 2.6 mm.
  • Fast response time of 0.5 ms or less.
  • IP67 ingress protection rating for harsh environments.
  • Wide operating temperature range of -25 to +55 °C.
  • Red LED light source (640 nm) for clear beam spot and easy alignment.
  • Orange LED for operation indication and Green LED for stability indication.
  • NPN open-collector transistor output.
  • Durable PBT housing and polyarylate lens construction.
  • Mountable with M3 screws, featuring metal inserts to prevent damage.

Rapid 0.5 ms response time and ultra-compact, 4.5mm thick design for high-speed, precise object detection in confined industrial spaces.

Technical Specification Matrix

ParameterValue
Sensing MethodThrough-Beam (Front sensing)
Sensing Range1 m
Minimum Detectable ObjectØ2.6 mm opaque object
Supply Voltage12 to 24 V DC ±10% (Ripple P-P 10% or less)
Current Consumption (Emitter/Receiver)10 mA or less (each)
OutputNPN open-collector transistor
Maximum Sink Current50 mA
Applied Voltage (Output)30 V DC or less
Residual Voltage (Output)2 V or less (at 50 mA), 1 V or less (at 16 mA)
Response Time0.5 ms or less
Protection RatingIP67 (IEC)
Operating Ambient Temperature-25 to +55 °C
Storage Ambient Temperature-30 to +70 °C
Ambient Humidity35 to 85 % RH (Operating and Storage)
Ambient IlluminanceIncandescent light: 3,000 lx or less
Light SourceRed LED (modulated), 640 nm peak emission wavelength
Housing MaterialPolyethylene terephthalate (PBT)
Lens MaterialPolyarylate
Cable0.1 mm² 3-core cabtyre cable, 2 m long (receiver)
IndicatorsOrange LED (operation), Green LED (stability)
Physical Weight (kg)0.02
Dimensions L x W x H (cm)0.45 x 1.6 x 1.8

Industrial Applications

1. High-Speed Small Part Detection on Production Lines

The EX-21B's ultra-compact size and rapid 0.5 ms response time make it ideal for accurately detecting small components, such as electronic chips or pharmaceutical tablets, moving at high speeds on automated assembly lines. Its 2.6 mm minimum detectable object size ensures precision in critical sorting or counting operations.

Problem Solved

Ensures accurate and rapid detection of miniature components, preventing production errors and bottlenecks in high-speed manufacturing processes.

0.5 ms response time2.6 mm min. object detectionUltra-compactHigh-speed sortingAssembly automation

2. Door/Gate Position Monitoring in Washdown Areas

With an IP67 protection rating and -25 to +55 °C operating temperature range, the EX-21B can reliably monitor the open/closed status of safety doors or access gates in industrial environments prone to moisture, dust, and temperature fluctuations, including areas requiring frequent washdowns. The 1m sensing range is sufficient for typical door gaps.

Problem Solved

Provides robust and dependable position sensing in challenging, wet, or dusty industrial settings without risk of sensor failure due to environmental exposure.

IP67 protection-25 to +55 °C operating temp1m sensing rangeWet environmentsSafety interlocks

3. Material Flow Verification in Packaging Machinery

The through-beam sensing principle and 1-meter range of the EX-21B allow for accurate detection of material presence or absence within packaging machines, such as verifying that bottles or boxes are correctly positioned before filling or sealing. Its compact form factor facilitates integration into tight spaces within complex machinery.

Problem Solved

Confirms consistent material flow and correct object positioning in automated packaging lines, reducing product waste and ensuring operational efficiency.

Thru-beam sensing1m sensing rangeCompact designPackaging automationMaterial verification
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