LV-21A Keyence Digital Laser Sensor

The Keyence LV-21A is a main amplifier unit with NPN output, optimized for high-speed laser sensing in automation, inspection, and quality control systems. Featuring dual output channels, ultra-fast 80 µs response time, and the ability to expand up to 8 units, it offers flexible integration and stable performance in high-throughput industrial environments.

Technical Specifications

Model: LV21A
Type: Digital Laser Sensor Amplifier (Main Unit)
Output Type: NPN Open-Collector
Weight: Approx. 120 g

Output & Response Time

• Control Output:
  • NPN Open-Collector × 2 Channels
  • Max Load Voltage: 40 VDC
  • Max Load Current: 100 mA
  • Residual Voltage: ≤1.0 V
• Response Time (Mode Dependent):
  • FINE: 80 µs
  • TURBO: 500 µs
  • SUPER TURBO: 4 ms
• Interference Prevention:
  • FINE: None
  • TURBO: Up to 2 Units
  • SUPER: Up to 4 Units

Protection & Safety Features

• Reverse Polarity Protection
• Overcurrent Protection
• Surge Absorption

Expansion Capabilities

• Expandable System: Supports up to 7 additional expansion units (Total: 8 Units including Main)

Power & Electrical Specifications

• Operating Voltage: 12 to 24 VDC (Ripple ≤10%)
• Power Consumption:
  • Max: 1.5 W
  • 12 V: ≤125 mA
  • 24 V: ≤62.5 mA

Environmental Resistance

• Operating Temperature: -10°C to +55°C (No Freezing)
• Relative Humidity: 35% to 85% RH (No Condensation)

Material & Construction

• Housing Material: Polycarbonate

Key Features & Benefits

✅ Ultra-Fast Response: 80 µs (FINE Mode) for high-speed detection.

✅ Dual Output Channels: NPN open-collector outputs for enhanced flexibility.

✅ Expandable System: Supports up to 7 additional expansion units for large-scale setups.

✅ Industrial-Grade Durability: Built-in protection against reverse polarity, overcurrent, and surges.

✅ Multi-Mode Interference Prevention: Up to 4 interference-preventive units for stable operation.

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