FS-N11N Digital Fibre Optic Amplifier

Part number FS-N11N

Digital fibre amplifier, NPN output, cable type, dual 4-digit display, 20 µs response, auto-calibration and power-saving modes, for FU-series fibre units.

CE
NPN
Cable type
Dual display

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Overview

The Keyence FS-N series amplifier drives FU-series fibre optic sensor heads for small-part detection, counting and positioning where the sensor must fit into tight spaces or hot environments. The FS-N11N is the cable-type main unit with NPN output: it has a dual display showing received light and threshold, a 20 µs ultra-fast mode, auto-calibration by pressing one button, and an energy-saving mode. Expansion units (FS-N12N) snap on to share power and wiring, and the amplifier automatically compensates for dust and LED ageing. Combined with the extensive FU fibre range — thru-beam, reflective, heat resistant, vacuum, narrow beam — it covers most micro-detection tasks on electronics and packaging lines.

Key features

Dual 4-digit display (incoming light / threshold), auto-calibration with one button
Response time selectable down to 20 µs; long-range mode for thru-beam fibres
NPN output (FS-N11P for PNP), cable type; expansion units FS-N12N
Dust-compensation (APC) and power-saving modes; timer and hysteresis settings
Compatible with all Keyence FU fibre units: thru-beam, reflective, heat-resistant, chemical-resistant

Typical applications

Detection of small components on SMT and assembly lines
Presence of labels, films and wafers
Counting objects at high speed
Detection in hot or confined spaces via fibre units

Industries

Technical specifications — FS-N11N

Sensing
Light source	Red LED 4-element
Response time	20 µs / 100 µs / 250 µs / 1 ms / 4 ms selectable
Fibre units	FU series (not included)
Functions	Auto calibration, APC, timer, hysteresis, zero shift
Output
Output	NPN open collector, 100 mA
External input	Yes (calibration/test)
Display	Dual 4-digit 7-segment, red/green
Power	12–24 V DC
Construction
Type	Main unit, cable (2 m)
Mounting	DIN rail
Expansion	FS-N12N (up to 16 units)
Environment
Ambient temperature	-20…+55 °C
Protection	IP40
Ambient light	20,000 lux (sunlight)

Specifications are summarised from the manufacturer's documentation for selection purposes. Always confirm against the current datasheet before design-in; we send the datasheet and the exact ordering code with every quotation.

Related part numbers and alternatives

Part number	Relationship
`FS-N11P`	PNP output version	Quote
`FS-N41N`	Newer FS-N40 series with larger display	Quote
`E3X-HD11`	Omron fibre amplifier alternative	Quote

Not sure which variant you need? Send us the nameplate photo or the old part number and we will identify the current equivalent.

Supply, documentation and lead time

What you receive

Genuine Keyence product in original packaging
Commercial invoice and packing list; Certificate of Conformance on request
Datasheet, declaration of conformity and country of origin as issued by the manufacturer
Manufacturer warranty, period stated on the quotation

How we quote

Reply within one business day with price, lead time and stock position
Alternatives proposed when they improve price or delivery
Incoterms of your choice: EXW Hai Phong, FOB/FCA, CIF/DAP to your site
Consolidated shipments for multi-line orders; export documentation for buyers outside Vietnam

Indicative HS code 8536.50 — final classification is confirmed on the commercial invoice.

Frequently asked questions

Which fibre unit do I need with the FS-N11N?

The amplifier is sold without fibres; choose an FU unit by sensing mode (thru-beam or reflective), target size and environment. We help select from the Keyence FU catalogue and quote both.

Can I connect several amplifiers together?

Yes. FS-N12N expansion units clip onto the main unit and share the power supply; up to 16 units can be chained with mutual interference prevention.

Is the FS-N11N available, and what is the lead time?

Typically 1–3 weeks through authorized channels. We confirm with the quotation.