FS-N41N Keyence FS-N40 Fiber Optic Sensor Amplifier

FS-N41N Keyence FS-N40 Digital Fiber Optic Sensor Amplifier (NPN, OLED)

Key Technical Specifications

• Brand: Keyence; Model: FS-N41N; Series: FS-N40
• Output type: NPN open-collector, 30 V max, 100 mA max per output
• Response time options: 23 µs (S-HSPD) up to 64 ms (TERA)
• Light source: red four-element LED at 660 nm wavelength
• Supply voltage: 10 to 30 VDC with 10% ripple P-P or less
• Power consumption: 870 mW or less (34 mA at 24 V)
• ECO modes reduce draw to 800 mW (ECO ON) and 710 mW (ECO FULL)
• Control outputs: 1; external inputs: none on this main unit

Performance and Environmental Tolerance

• The FS-N41N delivers eight selectable response speeds for flexible timing control.
• Fast 23 µs mode suits high-speed registration and small-part detection.
• Slow 64 ms mode stabilizes readings on fluctuating or low-contrast targets.
• Operating temperature range spans -20 to +55 °C without freezing.
• The amplifier derates its thermal limits as you add expansion units.
• Open-collector output keeps residual voltage low at 1.4 V at 10 mA.
• Residual voltage reaches 2 V across the 10–100 mA load range.
• Stable LED emission supports repeatable detection and resists ambient light interference.

Expansion and Installation Guide

• Connect up to 16 expansion units for a total of 17 amplifiers.
• A dual-output model counts as two units within this expansion limit.
• Mount the cable-type main unit on a DIN rail or bracket near the sensing point.
• Wire the 10–30 VDC supply with Class 2 or LPS protection.
• Keep supply ripple below 10% P-P to protect measurement stability.
• Route output cabling away from high-current lines to limit electrical noise.
• Set response mode through the OLED interface before production starts.
• Verify output timing against your controller input specifications.

Package Contents

• 1 × Keyence FS-N41N main amplifier unit
• 1 × Instruction manual
• 1 × Mounting bracket and hardware set
• Protective packaging for safe transport
• Shipping via FedEx, UPS, or DHL

Frequently Asked Questions

• Q: What is the difference between the FS-N41N and expansion units?
  A: The FS-N41N is a main unit with one NPN output and an OLED display. Expansion units add channels but lack the main display.
• Q: How many amplifiers can I connect in one system?
  A: You can link up to 16 expansion units, giving 17 amplifiers total. A dual-output unit counts as two.
• Q: Which response time should I choose?
  A: Use 23 µs for high-speed detection and 64 ms for stable readings on difficult targets.
• Q: What supply voltage does this sensor need?
  A: It runs on 10 to 30 VDC with ripple at 10% P-P or less, using a Class 2 or LPS source.
• Q: Does the FS-N41N include external inputs?
  A: No, this main unit has no external input. It provides one NPN control output.
• Q: What is the operating temperature range?
  A: The sensor works from -20 to +55 °C without freezing, with derating as you add units.
• Q: Is stock available and how fast do you ship?
  A: Yes, we hold new original stock and ship within 5 days via DHL, FedEx, or UPS.
• Q: What is your return policy?
  A: We accept returns within 30 days of delivery.