DX-15/30/50/100 Series Ultra-thin Through-beam Photoelectric Sensor

Name: DX-15/30/50/100 Series Ultra-thin Through-beam Photoelectric Sensor
Brand: DAIDISIKE
SKU: dx-15-30-series-ultra-thin-self-contained-photoelectric-sensor
Availability: InStock

Ultra-thin through-beam pairs from 150mm to 1000mm: front or side sensing, 1mm object detection, NPN/PNP, IP67.

DX ultra-thin through-beam photoelectric sensor - front-sensing (F) and side-sensing (L) emitter and receiver pairs with visible red beam

🔍 Click to enlarge · 1/18

Technical Specifications

Model	DX-50L, DX-100L, DX-50F, DX-100F (N/P versions); DX-15AN/BN, DX-30AN/BN, DX-15EAN/EBN, DX-30EAN/EBN
Sensing method	Through-beam (opposed mode): matched emitter and receiver pair, amplifier built in (ultra-thin housing)
Detection range	DX-15 = 150 mm; DX-30 = 300 mm; DX-50L / DX-50F = 500 mm; DX-100L / DX-100F = 1000 mm
Optical layout	Front-sensing (F suffix, or no letter on short-range models) or side-sensing with a 90-degree optical axis (L suffix, or E on short-range models)
Output type	DX-50/DX-100: NPN or PNP, selected by the (N)/(P) order option, with normally-open / normally-closed switchable in the wiring. DX-15/DX-30: NPN only, with A = Light-ON (N.O.) and B = Dark-ON (N.C.) fixed by part number.
N.O. / N.C. switching (DX-50 / DX-100)	Short the white wire to the blue (negative) wire and the black output wire changes from normally-open to normally-closed
Wiring — emitter (2-wire)	Blue = negative (−); Brown = positive (+)
Wiring — receiver (4-wire)	Blue = negative (−); Brown = positive (+); Black = signal output; White = N.C. switching wire
Light source	680nm infrared
Response time	0.5ms
Minimum detectable object	1mm
Operating voltage	12-24VDC
Protection rating	IP67

Overview

The DX series is a through-beam (opposed-mode) photoelectric sensor supplied as a matched emitter and receiver pair in an ultra-thin housing. Because detection depends on the beam being broken rather than on light reflected back from the target, it reads dark, glossy and awkwardly shaped parts that a diffuse sensor struggles with — and it does so from a housing slim enough to fit in a narrow slot, along a guide rail, or between closely spaced panels where a standard photoelectric body will not go.

Two optical layouts are offered across the range. Front-sensing units emit along the axis of the housing; side-sensing units turn the optical axis through 90 degrees so the pair can be mounted flat against a rail or panel without a bracket redesign. Detection distances run from 150 mm to 1000 mm depending on model, and the longer-range models add selectable NPN or PNP output with normally-open / normally-closed switching done in the wiring rather than by ordering a different part number.

Key Facts — DX-15/30/50/100 at a glance

The DX series is a through-beam (opposed) sensor: each model number is a matched emitter/receiver pair, not a single reflective unit. Detection occurs when an object breaks the beam between the two housings.
Detection distances across the series are 150 mm (DX-15), 300 mm (DX-30), 500 mm (DX-50L / DX-50F) and 1000 mm (DX-100L / DX-100F).
Both optical layouts are available at every distance: front-sensing (beam along the housing axis) and side-sensing (beam turned 90 degrees for rail-side or panel-gap mounting).
On the 500 mm and 1000 mm models the model code carries an L or F suffix — L = side-sensing, F = front-sensing — and an (N/P) option for NPN or PNP output.
The 500 mm and 1000 mm models have normally-open / normally-closed switchable output, selected by wiring rather than by part number: shorting the white wire to the blue (negative) wire changes the black output wire from N.O. to N.C.
The emitter is a 2-wire unit (blue = negative, brown = positive); the receiver is a 4-wire unit (blue = negative, brown = positive, black = signal output, white = N.C. switching wire).
The DX series detects objects as small as 1 mm and is specified at a 0.5 ms response time, in an IP67-rated ultra-thin housing with the amplifier built in — no external amplifier unit is required.

Features & Benefits

Through-beam detection — reads dark, glossy and irregular targets

Detection depends on the beam being interrupted, not on how much light the target reflects back. Black rubber, polished metal, matte plastic and irregular edges all block the beam equally, which removes the colour- and finish-dependence that limits diffuse-reflective sensors.

Ultra-thin housing with front-sensing or side-sensing optics

Fits where a standard-body photoelectric sensor cannot. Choose the side-sensing layout (E suffix on 150/300 mm models, L suffix on 500/1000 mm models) to turn the beam 90 degrees and mount flat along a rail or panel without redesigning the bracket.

One family from 150 mm to 1000 mm

The same ultra-thin form factor covers short in-machine gaps at 150 and 300 mm and wider spans at 500 and 1000 mm, so a machine using several detection points can standardise on one housing style, one mounting method and one wiring convention.

NPN or PNP, with N.O./N.C. switched in the wiring

The 500 mm and 1000 mm models are ordered as (N) or (P) for sinking or sourcing output, and the output logic is changed on site: short the white wire to blue (negative) and the black output wire switches from normally-open to normally-closed. One part number covers both logic states, which cuts the number of variants a distributor has to stock.

Detects objects as small as 1mm

Reliable presence sensing for pins, small components and thin edges that conventional-range photoelectric sensors often miss.

0.5ms response time

Supports fast pass and presence detection on high-speed feeding and sorting lines.

IP67-rated despite the ultra-thin profile

Dust-tight and protected against temporary immersion, suitable for stations with oil mist or washdown exposure.

Self-contained amplifier — no external amplifier unit required

Simplifies wiring and panel space versus fiber-optic sensors that need a separate amplifier.

Applications

Small-parts presence detection in electronics and semiconductor equipment — The 1 mm minimum detectable object and ultra-thin housing suit mounting inside compact internal mechanisms where both emitter and receiver can be fixed either side of the path.

High-speed labeling and sorting line pass detection — 0.5 ms response time supports fast-cycle pass detection of thin sheet objects.

Rail-side or panel-gap position detection using the side-sensing layout — The side-sensing variant turns the optical axis 90 degrees, so the pair can be installed along a rail or panel gap without changing the mounting geometry.

Detecting dark, glossy or transparent-edged parts — Through-beam operation removes the dependence on target reflectivity, so black components, polished metal and shiny films are detected on the same settings as matte parts.

Wider machine openings and conveyor gaps up to 1000 mm — DX-100L and DX-100F extend the same ultra-thin format to a 1 m span, covering conveyor widths and machine apertures that the 150/300 mm models cannot reach.

Detection stations exposed to oil mist, coolant spray or washdown — IP67 protection lets the sensor operate in compact stations with oil mist or moisture exposure.

Retrofit into machines where housing depth is constrained — The ultra-thin, self-contained-amplifier housing needs no separate amplifier installation space, easing retrofits into depth-constrained mechanisms.

Mixed NPN and PNP control environments — Selecting (N) or (P) on the 500/1000 mm models lets the same sensor family serve both sinking-input and sourcing-input controllers across a plant.

Models & Ordering Information

Long range, side-sensing (500 / 1000 mm)

DX-50L (N/P)DX-100L (N/P)

L = side-sensing; the optical axis exits at 90 degrees to the housing. DX-50L = 500 mm, DX-100L = 1000 mm. (N) = NPN output, (P) = PNP output. Normally-open / normally-closed is switchable by wiring, not by part number.

Long range, front-sensing (500 / 1000 mm)

DX-50F (N/P)DX-100F (N/P)

F = front-sensing; the optical axis runs along the housing. DX-50F = 500 mm, DX-100F = 1000 mm. (N) = NPN output, (P) = PNP output. Normally-open / normally-closed is switchable by wiring, not by part number.

Short range, front-sensing (150 / 300 mm)

DX-15ANDX-15BNDX-30ANDX-30BN

DX-15 = 150 mm, DX-30 = 300 mm. A = Light-ON (normally open); B = Dark-ON (normally closed); N = NPN output. On these short-range models the output logic is fixed by the part number.

Short range, side-sensing (150 / 300 mm)

DX-15EANDX-15EBNDX-30EANDX-30EBN

E = side-sensing housing; the optical axis exits at 90 degrees to the sensor body. Catalog print shows Dark-ON for DX-30EAN, which conflicts with the E+A naming convention used elsewhere — confirm the actual output logic with the factory before ordering.

How to read the DX model code

DX-[distance][layout] ([output])

Distance: 15 = 150 mm, 30 = 300 mm, 50 = 500 mm, 100 = 1000 mm. Layout on long-range models: F = front-sensing, L = side-sensing. Layout on short-range models: no letter = front-sensing, E = side-sensing. Output on long-range models: (N) = NPN, (P) = PNP, with N.O./N.C. selected in the wiring. Output on short-range models: A = Light-ON, B = Dark-ON, N = NPN.

How to Select

Choose the detection distance first: DX-15 for 150 mm, DX-30 for 300 mm, DX-50L/DX-50F for 500 mm, DX-100L/DX-100F for 1000 mm. Measure the actual emitter-to-receiver span and leave margin for alignment tolerance.
Choose the optical layout second: front-sensing (DX-50F/DX-100F, or DX-15AN/DX-30AN) when the beam should run along the housing axis; side-sensing (DX-50L/DX-100L, or DX-15EAN/DX-30EAN) when the beam must exit at 90 degrees for mounting flat along a rail or panel.
Choose the output polarity third: on the 500 mm and 1000 mm models, specify (N) for NPN sinking output or (P) for PNP sourcing output to match your controller's input card. Confirm the input type before ordering.
Set the output logic in the wiring, not the part number, on 500/1000 mm models: the black output wire is normally-open by default; short the white wire to blue (negative) to make it normally-closed. This means one stocked part covers both logic states.
On the 150/300 mm models the output logic is fixed by part number instead: choose an A model (DX-15AN, DX-15EAN) for Light-ON / normally-open, or a B model (DX-15BN, DX-30EBN) for Dark-ON / normally-closed. These models are NPN only.
Confirm the actual output logic of DX-30EAN with the factory before ordering, since the catalog print shows Dark-ON while the E+A naming convention indicates it should be Light-ON.
Remember that every DX model number is a matched emitter/receiver pair — both housings must be mounted facing each other across the detection path, with power run to each.
Power supply is unified at 12-24VDC across the entire series, so no separate voltage selection is required.

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

When NOT to specify the DX-15/30/50/100 — and what to use instead

Only one side of the detection path can be mounted or wired

Why not: Every DX model is a through-beam pair: the emitter and receiver are separate housings that must face each other, each with its own power connection. There is no single-housing reflective version in this series.

Use instead: a diffuse-reflective sensor such as the H series or H08/R12 micro diffuse range, or the DD diffuse-reflection area grid where a detection field rather than a point is needed

Detection distance needs to exceed 1000 mm

Why not: The longest-range models in this family, DX-100L and DX-100F, are rated to 1000 mm.

Use instead: the BX-H4000 long-range background-suppression sensor (up to 4 m) or a longer-range through-beam series such as the H-M M12/M18 range

A PNP output is required at 150 mm or 300 mm

Why not: The short-range DX-15 and DX-30 models are documented as NPN output only. PNP is offered on the 500 mm and 1000 mm models via the (P) order option.

Use instead: DX-50F or DX-50L with the (P) option if the longer range is acceptable, or the BGS-CX441/CX442 or E3JK series for PNP at shorter range

Ordering DX-30EAN and assuming it is Light-ON without checking further

Why not: The catalog print shows Dark-ON for DX-30EAN, which conflicts with the E+A naming convention used elsewhere in the series — the actual output logic is unconfirmed.

Use instead: confirm the actual output logic with us before ordering, or select a model whose logic is unambiguous, such as DX-15EAN

The application is a safety door interlock or personnel-guarding function

Why not: The DX photoelectric series is a detection sensor family, not the DXL safety door lock product line, and it carries no safety rating.

Use instead: the correct DXL safety door lock series for interlocking, or a certified safety light curtain (e.g. DQC/DQA series) for personnel guarding

Personnel guarding or any other safety-related presence detection

Why not: No safety rating or safety certification is published for this series.

Use instead: a certified safety light curtain (e.g. DQC/DQA series) for personnel protection

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.

⚠ 待老板确认（2026-07-28）：以下 4 项沿用自旧版 DX-15/30 资料，尚未在新的 DX-50/DX-100 资料中得到确认 —— 响应时间 0.5ms、最小可检测物体 1mm、防护等级 IP67、供电 12-24VDC。长距离型号（500/1000mm）的实际数值请核对后更新。
⚠ 待老板确认（2026-07-28）：新长距离型号是否也提供 680nm 红外光源（旧资料值）。
Hysteresis
MTBF
Operating and storage temperature range
Cable length and cable/connector type
Actual output logic (Light-ON vs Dark-ON) of DX-30EAN, which conflicts with the naming convention in the current catalog print
Certification status (documents said to be available on request but not specified)

Frequently Asked Questions

Is the DX series a through-beam or a diffuse-reflective sensor?

It is a through-beam (opposed-mode) sensor. Each model number supplies a matched emitter and receiver pair that mount facing each other across the detection path, and an object is detected when it breaks the beam between them. This is why the series handles dark, glossy and irregular targets that a diffuse-reflective sensor can struggle to see.

What detection distances are available in the DX series?

Four distances: 150 mm (DX-15), 300 mm (DX-30), 500 mm (DX-50L / DX-50F) and 1000 mm (DX-100L / DX-100F). Each distance is available in both front-sensing and side-sensing optical layouts.

What is the difference between the L and F suffixes on DX-50 and DX-100?

L denotes side-sensing — the optical axis exits at 90 degrees to the housing, so the pair can be mounted flat along a rail or panel. F denotes front-sensing — the beam runs along the axis of the housing. Both suffixes are available at 500 mm and 1000 mm, and both accept the (N) NPN or (P) PNP output option.

What does (N/P) mean in model numbers like DX-50L (N/P)?

It is the output-polarity option: (N) selects NPN sinking output, (P) selects PNP sourcing output. Specify one when ordering, to match your PLC or controller input card — NPN for sinking inputs common on Japanese-style equipment, PNP for sourcing inputs common on European and North American equipment.

How do I switch the DX-50 or DX-100 output between normally-open and normally-closed?

In the wiring, not by ordering a different part. The receiver is a 4-wire unit: blue is negative, brown is positive, black is the signal output and white is the switching wire. The black output is normally-open as delivered; short the white wire to the blue (negative) wire and the black output becomes normally-closed.

How is the DX emitter wired compared with the receiver?

The emitter is a 2-wire unit — blue to negative, brown to positive — and needs no signal connection. The receiver is a 4-wire unit — blue to negative, brown to positive, black as the signal output, and white as the normally-closed switching wire.

What is the smallest object the DX series can detect?

The DX series can detect opaque objects as small as 1 mm, based on the manufacturer's published specification.

What is the response time of the DX series photoelectric sensor?

0.5 ms, according to the manufacturer's specification.

What is the difference between the A and B suffix models on DX-15 and DX-30?

On the 150 mm and 300 mm models the output logic is fixed by part number: A models output ON when receiving light (Light-ON, normally open); B models output ON when the beam is blocked (Dark-ON, normally closed). These models are NPN output only. The longer-range DX-50 and DX-100 models handle this differently — the logic is switched in the wiring instead.

What does the E in model names like DX-15EAN mean?

E denotes a side-sensing housing on the 150/300 mm models, where the optical axis exits at 90 degrees to the sensor body, allowing installation along a rail or panel side without changing the mounting geometry. On the longer-range 500/1000 mm models the same side-sensing layout is designated by the L suffix instead.

Is the DX series waterproof?

It carries an IP67 protection rating, meaning it is dust-tight and protected against the effects of temporary immersion in water.

Does the DX series need an external amplifier?

No. The amplifier is built into the sensor housing (self-contained amplifier design), so no separate amplifier unit is required.

What is the operating voltage of the DX series?

12-24VDC, per the manufacturer's specification.

Is the DX ultra-thin photoelectric sensor the same product as the DX safety door lock series?

No. Despite the shared DX prefix, this series is an ultra-thin through-beam photoelectric sensor, and the safety door lock is a separate product line (DXL). They should not be confused when searching or ordering.

Works Well Together

On the same machine or line, DX-15/30/50/100 is typically ordered together with: Proximity Sensors · Laser Switch Sensors · Relay & Timer Modules

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