FS-KNS Slot Photoelectric Sensor (Plug-in Type)

Name: FS-KNS Slot Photoelectric Sensor (Plug-in Type)
Brand: DAIDISIKE
SKU: fs-kns-slot-photoelectric-sensor
Availability: InStock

5 mm-slot sensor with simultaneous NO+NC outputs, 0.3 ms response, and 1 mm minimum detectable object.

FS-KNS Slot Photoelectric Sensor (Plug-in Type) - product photo

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Technical Specifications

Output type	N = NPN (NO, NC); P = PNP (NO, NC)
Wiring	White = NO, Black = NC, Brown = V+, Blue = V-
Supply voltage	5-24VDC ±10%
Load current	100mA Max
Response time	0.3ms Max
Protection rating	IP64
Material	ABS housing
Minimum detectable object	φ1mm opaque object
Detection slot	5mm slot width
Housing profiles	302, 303, 304, 305, 306, 307

Overview

FS-KNS is a slot-type (fork/U-slot) photoelectric sensor: an object passing through the 5 mm slot interrupts the light beam between the emitter and receiver mounted face-to-face, triggering a switching output. It ships in NPN or PNP versions with both NO and NC signals brought out on separate wires (white = NO, black = NC, brown = V+, blue = V-). It suits machine builders and equipment integrators in packaging, labeling, small-parts assembly, and embedded terminal/POS equipment who need a compact, low-cost sensor to detect or count small objects passing through a fixed slot.

The sensor combines a minimum detectable object size of 1 mm with a maximum response time of 0.3 ms, so it can resolve fine pins, wires, or thin flags moving through the slot in quick succession without missed detections. It operates on a wide 5-24 VDC (±10%) supply range, switches up to 100 mA at its output, and is housed in IP64-rated ABS suited to typical workshop dust and splash conditions. Six housing profiles (302-307) are available within the series for different mounting orientations.

Features & Benefits

Complementary NO + NC outputs on separate wires

Get both a normally-open and a normally-closed signal from one sensor without any wiring selection. One line can drive detection logic while the other supports interlock or wire-break diagnostics.

Detects objects down to 1 mm

The minimum detectable object is a φ1 mm opaque item, suitable for sensing fine pins, thin wires, or narrow flags that pass through the slot.

0.3 ms max. response time

Fast enough to follow closely-spaced objects moving through the slot without missing a detection.

Wide 5-24 VDC supply range (±10%)

The same sensor can be powered directly from a 5 V logic board or a 24 V industrial control circuit, without a separate power conversion stage.

100 mA max. switching capacity

Sufficient to drive small relays or indicator loads directly at the sensor output.

IP64-rated ABS housing

Dust-tight and splash-resistant construction suited to typical workshop environments.

Six housing profiles (302-307)

A range of outline shapes within the same series allows selection of the mounting orientation and lead-exit direction that fits the installation space.

Applications

High-speed parts counting on vibratory feeders / feed rails — 0.3 ms response supports objects passing the slot in quick succession without missed counts.

Fine-part presence/absence detection (pins, terminals, springs) — φ1 mm minimum detectable object size resolves small parts that standard photoelectric sensors may miss.

Home-position / limit-position sensing requiring an NC interlock — Simultaneous NO+NC output allows one wire for position feedback and the other for interlock logic without adding a second sensor.

Flag/paddle detection in 5 V embedded and terminal equipment (e.g. printers, kiosks) — The 5-24 VDC supply range lets the sensor run directly from a 5 V logic rail.

Small relay or indicator drive directly from sensor output — 100 mA switching capacity removes the need for an intermediate driver stage in light loads.

General slot-passage detection in dusty workshop settings — IP64 ABS housing tolerates dust and occasional splash without a separate enclosure.

Models & Ordering Information

FS-KNS Series — Housing Profile Numbers

302303304305306307

Six housing profile numbers as identified in the product catalogue (page 42); each is available in an NPN (N) or PNP (P) output version with simultaneous NO and NC signals. The exact printed order-code format (how the profile number and N/P suffix are combined) is pending factory confirmation.

How to Select

Choose by output type: suffix N = NPN (NO+NC simultaneous output); P = PNP (NO+NC simultaneous output). Select according to whether the on-site PLC/controller input is sinking (NPN) or sourcing (PNP).
Wiring is fixed and pre-defined: white = normally-open (NO) signal, black = normally-closed (NC) signal, brown = supply positive (V+), blue = supply negative (V-); both signal wires are brought out simultaneously with no switching required.
Choose by housing profile/mounting orientation: the series offers six housing profile numbers (302-307) for different mounting space and lead-exit direction requirements.
Supply voltage does not require model selection: the whole series shares a common 5-24VDC ±10% wide-voltage design; simply connect to the equipment's actual supply voltage.
Check target size against slot width: FS-KNS has a fixed 5 mm slot width and detects objects down to φ1 mm; if the target is smaller than φ1 mm, or the required slot width is larger than 5 mm, a different slot-sensor series is needed.

📘 Need the full method? NPN vs PNP Sensor Outputs Explained

When NOT to specify the FS-KNS — and what to use instead

The object to be detected is smaller than about phi1 mm, or the required slot is wider than 5 mm

Why not: The FS-KNS selection guide itself states the sensor has a fixed 5 mm slot width and detects objects down to phi1 mm; a target smaller than phi1 mm or a wider required slot needs a different series.

Use instead: a micro-slot model such as DD-L25/L45 for finer resolution, or a wide-slot model such as DD-303N/DD-403N (13 mm gap) for a wider opening

The output only needs a single signal and simultaneous NO+NC wiring is unnecessary complexity for the panel

Why not: FS-KNS brings out both NO (white) and NC (black) signals simultaneously on separate wires as a fixed design feature, with no single-output variant documented.

Use instead: a series offering a single selectable output logic, such as the DD-670 series (N/P/NA/R by model or by the (L) terminal)

The installation is outdoors or subject to direct water spray rather than occasional workshop splash

Why not: The housing is rated IP64 (dust-tight, splash-resistant), which the source describes as suited to typical workshop dust and splash conditions, not sustained water-jet exposure.

Use instead: an IP65-rated slot sensor such as DD-L25/L45 for washdown-adjacent environments

Specifications we do not publish yet

We only publish a figure once we are confident it is true. The items below are still being validated through further testing and real-world customer feedback, so for now we would rather leave them open than guess. If one of them matters to your design, ask us for the latest validated status.

The exact order-code format combining the housing profile number (302-307) and N/P suffix is still being finalized — ask us to confirm the code before ordering
Light source type and wavelength are not stated in the source material
Slot depth (fork insertion depth) is not stated
Hysteresis (differential travel) is not stated
MTBF / rated mechanical or electrical lifetime is not stated
Operating and storage temperature range is not stated
Cable length is not stated
No certification documents are published on the product page; available on request only, specific standards/marks not stated

Frequently Asked Questions

What is the slot width of the FS-KNS sensor?

The FS-KNS has a fixed slot (detection gap) width of 5 mm.

What is the smallest object the FS-KNS can detect?

It can detect opaque objects down to 1 mm in diameter passing through the slot.

Does the FS-KNS provide both NO and NC outputs at the same time?

Yes. Both a normally-open (white wire) and a normally-closed (black wire) signal are brought out simultaneously on separate wires — there is no output-mode selection required.

What is the difference between the N and P suffix in the model name?

N indicates an NPN output version and P indicates a PNP output version; both versions provide simultaneous NO and NC outputs.

What supply voltage does the FS-KNS require?

It operates on a wide 5-24 VDC ±10% supply range, allowing the same sensor to be used with 5 V logic boards or 24 V industrial control circuits.

What is the response time of the FS-KNS?

The maximum response time is 0.3 ms.

What is the maximum switching (load) current?

The maximum switching capacity is 100 mA.

What environmental protection rating does the FS-KNS housing have?

The housing is rated IP64 and made of ABS.

How many housing variants are available in the FS-KNS series?

Six housing profiles (numbered 302 through 307) are available within the series for different mounting orientations.

How is the FS-KNS wired?

It is a plug-in (pin) type sensor with four lead wires broken out for connection: white (NO), black (NC), brown (V+), and blue (V-).

Works Well Together

On the same machine or line, FS-KNS is typically ordered together with: Photoelectric Sensors · Fiber Optic Sensors · Proximity Sensors

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