Product Description

The Keyence FS-V21G is a high-performance digital fiber optic amplifier designed for precise detection in industrial automation applications. It features a green LED light source and offers selectable response times ranging from 50 µs (High Speed) to 4 ms (Ultra Turbo), accommodating various detection needs. The amplifier includes a shift function with a range of ±1,999 and supports multiple timer modes, including OFF, OFF-delay, ON-delay, and one-shot timers, with durations from 1 to 500 ms. Its NPN open-collector output can handle up to 100 mA with a residual voltage of 1 V max. The FS-V21G operates on a 12 to 24 VDC power supply and offers low power consumption, making it suitable for energy-efficient applications. Housed in a durable polycarbonate case, it is engineered to withstand environmental challenges, offering protection against reversed polarity, overcurrent, and surge conditions. Its robust design ensures reliable performance in demanding industrial settings.

Technical Specifications

• Model: FS-V21G
• Type: Main unit, NPN
• Light Source: Green LED
• Response Time:
• 50 µs (High Speed)
• 250 µs (Fine)
• 500 µs (Turbo)
• 1 ms (Super Turbo)
• 4 ms (Ultra Turbo)
• 500 µs (High Resolution)
• Output Selection: Light-ON/Dark-ON (switch-selectable)
• Indicator Lamps:
• Operation indicator: Red LED
• Dual 7-segment display: Preset Value (4-digit green LED) and Current Value (4-digit red LED)
• Excess Gain bar LED monitor: 85% to 115% in 7 steps
• Detection Modes: Light intensity, rising edge, falling edge
• Shift Function: ±1,999 (variable)
• Timer Functions:
• OFF-delay timer
• ON-delay timer
• One-shot timer
• Selectable timer duration from 1 to 500 ms
• Control Output: NPN open-collector, 100 mA max. (40 VDC max.), Residual voltage: 1 V max.
• Power Supply Voltage: 12 to 24 VDC ±10%, Ripple (P-P) 10% or less
• Power Consumption:
• Normal:
• S-APC OFF: 580 mW max. (24 mA max. at 24 VDC)
• S-APC ON: 720 mW max. (30 mA max. at 24 VDC)
• ECO half:
• S-APC OFF: 480 mW max. (20 mA max. at 24 VDC)
• S-APC ON: 600 mW max. (25 mA max. at 24 VDC)
• ECO all:
• S-APC OFF: 430 mW max. (18 mA max. at 24 VDC)
• S-APC ON: 550 mW max. (23 mA max. at 24 VDC)
• Environmental Resistance:
• Ambient Light:
• 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
• Case Material: Polycarbonate
• Weight: Approx. 80 g (including 2-m cable)​