Product Description

The KEYENCE FS-V21R is a digital fiber optic amplifier designed for precise and flexible sensing applications. This NPN-type main unit features a red LED light source and offers multiple detection modes, including light intensity, rising edge, and falling edge. It boasts a high-speed response time of 50 µs in High-Speed mode and provides a shift function with a range of ±1,999. The amplifier supports selectable Light-ON/Dark-ON operation modes and is equipped with dual 7-segment displays for preset and current values, along with a bar LED monitor for excess gain indication. With a compact polycarbonate housing measuring 30 mm (H) x 9 mm (W) x 70 mm (D) and a weight of approximately 80 g (including a 2-meter cable), the FS-V21R is suitable for various industrial applications requiring reliable and precise optical sensing.​

Technical Specifications

• Model: FS-V21R
• Type: Digital Fiber Optic Amplifier, Cable Type, Main Unit, NPN
• Light Source: Red LED
• Detection Modes: Light intensity, rising edge, falling edge
• Response Time:
• High-Speed: 50 µs
• High Resolution: 500 µs
• Fine: 250 µs
• Turbo: 500 µs
• Super Turbo: 1 ms
• Ultra Turbo: 4 ms
• Shift Function: ±1,999 (variable)
• Timer Function: OFF, OFF-delay, ON-delay, One-shot (1 to 500 ms)
• Control Output: NPN open collector, 100 mA max., 40 V max., residual voltage 1 V max.
• Power Supply: 12 to 24 VDC ±10%, Ripple (P-P) 10% or less
• Power Consumption:
• Normal: 650 mW (S-APC OFF), 720 mW (S-APC ON)
• ECO Half: 530 mW (S-APC OFF), 600 mW (S-APC ON)
• ECO All: 480 mW (S-APC OFF), 550 mW (S-APC ON)
• Ambient Light Resistance: Incandescent lamp: 20,000 lux max., Sunlight: 30,000 lux max.
• Ambient Temperature: -10 to +55°C (No freezing)
• Relative Humidity: 35 to 85% RH (No condensation)
• Vibration Resistance: 10 to 55 Hz, Double amplitude 1.5 mm, 2 hours in each of the X, Y, and Z directions
• Shock Resistance: 500 m/s², 3 times in each of the X, Y, and Z directions
• Housing Material: Polycarbonate
• Dimensions: 30 mm (H) x 9 mm (W) x 70 mm (D)
• Weight: Approximately 80 g (including 2-meter cable)​