Product Description

​The Keyence LV-21A is a main amplifier unit in the LV series of digital laser sensors, designed for precise distance measurement in industrial automation applications. It features two NPN open-collector control outputs, each capable of handling up to 40 VDC and 100 mA, with a maximum residual voltage of 1.0 V. The amplifier offers three response speeds—FINE (80 µs), TURBO (500 µs), and SUPER (4 ms)—to accommodate various detection needs. It also provides protection circuits including reversed polarity protection, over-current protection, and a surge absorber. The unit can be expanded with up to seven additional units, allowing for scalable configurations in complex systems. Operating within a temperature range of -10 to +55°C and a humidity range of 35 to 85% RH (non-condensing), the LV-21A is built to withstand demanding industrial environments.

Technical Specifications

• Model: LV-21A
• Type: NPN output main amplifier unit
• Control Output: NPN open-collector ×2 channels, 40 VDC max., 100 mA max., residual voltage 1.0 V max.
• Response Speed:
• FINE: 80 µs
• TURBO: 500 µs
• SUPER: 4 ms
• Interference Prevention:
• FINE: None
• TURBO: 2 units
• SUPER: 4 units
• Protection Circuit: Reversed polarity protection, over-current protection, surge absorber
• Unit Expansion: Up to 7 additional units (8 units including the main unit)
• Power Supply: 12 to 24 VDC, Ripple (P-P) 10% or less
• Power Consumption: 1.5 W max. (125 mA max. for 12 V, 62.5 mA max. for 24 V)
• Ambient Temperature Range: -10 to +55°C (no freezing)
• Relative Humidity: 35 to 85% RH (no condensation)
• Material: Polycarbonate (main unit case)
• Weight: Approximately 120 g​