DS Right-Angle (90°) Laser Through-Beam Switch M4 / M6

Name: DS Right-Angle (90°) Laser Through-Beam Switch M4 / M6
Brand: DAIDISIKE
SKU: ds-right-angle-laser-through-beam-switch-m4-m6
Availability: InStock

90° right-angle M4/M6 laser through-beam switch with a 1.5-2mm spot and 20m detection range for tight spaces.

DS Right-Angle (90°) Laser Through-Beam Switch M4 / M6 - product photo

🔍 Click to enlarge · 1/13

Technical Specifications

Type	Laser through-beam photoelectric switch (90° right-angle)
Light source	650nm red laser
Detection method	Through-beam (emitter + receiver pair)
Detection range	M4: 20m; M6: 20m (against 100x100mm white paper target)
Laser spot size	M4: approx. 1.5mm (standard); M6: approx. 2mm (standard); custom 0.5mm/1.0mm small spot available
Output type	NPN / PNP, NO (suffix 1) / NC (suffix 2)
Working voltage	10-30VDC
Thread size	M4x0.5mm / M6x0.75mm
Structure	90° right-angle (bent) body
Protection rating	IP65
Housing material	Stainless steel
Response time	5ms
Switching frequency	100Hz (max)
Leakage current	<0.01mA
Voltage drop	<1.5V
Switching hysteresis	<15% (Sr)
Repeatability	<5% (Sr)
Max load current	150mA
Overload protection point	180mA
Overall length	M4: 18.0mm; M6: 20.0mm
Threaded section length	M4: 11.0mm; M6: 14.0mm
Cable	φ3.0mm OD, 1.5m PVC, 3x0.15mm² conductors

Overview

The DS right-angle M4/M6 laser through-beam switch is a through-beam (opposed) photoelectric sensor built into an M4x0.5mm or M6x0.75mm threaded, 90 degree bent stainless steel housing. The emitter and receiver are used as a matched pair, facing each other across the detection gap; when an object interrupts the 650nm laser beam, the receiver switches its output.

It is built for machine builders and integrators who need to detect small, thin, or precisely positioned parts in equipment where space around the mounting point is limited and a straight-body sensor cannot be aimed correctly. Both the M4 and M6 versions reach a 20m detection range against the standard white-paper test target, with a 1.5-2mm laser spot, 5ms response time and IP65 protection.

Key Facts — DS at a glance

The DS M4 and M6 right-angle laser through-beam switches both provide a 20m detection range against a standard 100x100mm white paper target.
The M4 version uses an M4x0.5mm thread with an 18.0mm overall body length; the M6 version uses an M6x0.75mm thread with a 20.0mm overall body length.
Standard laser spot size is approximately 1.5mm for the M4 model and approximately 2mm for the M6 model, both available with custom 0.5mm-1.0mm small-spot options.
Both models operate on 10-30VDC, offer NPN or PNP output with NO or NC selectable logic, and carry an IP65 protection rating in a stainless steel housing.
Response time is 5ms with a maximum switching frequency of 100Hz.
The sensor housing is bent at 90 degrees so the cable exits sideways, allowing installation in mounting positions where a straight in-line sensor body cannot be aimed at the target.

Features & Benefits

Small 1.5-2mm laser spot for fine-feature detection

The M4 model has a standard ~1.5mm spot (customizable to 0.5mm/1mm), and the M6 model has a standard ~2mm spot (customizable to 0.5mm/1.0mm), letting it resolve narrow gaps and small parts that a larger-beam diffuse sensor would miss.

20m through-beam range in a compact threaded body

Both the M4 and M6 versions reach a 20m emitter-to-receiver range against the standard white-paper test target, well beyond what a diffuse-reflective sensor of the same size can achieve.

90° right-angle body for space-constrained mounting

The bent housing lets the cable exit sideways instead of straight back, so the sensor can be installed where a straight in-line body would collide with adjacent structure.

Selectable NPN/PNP output and NO/NC logic

Each thread size is offered in four wiring/logic combinations (NPN-NO, PNP-NO, NPN-NC, PNP-NC), so it can be matched directly to the PLC or controller input type without an external relay.

Stainless steel threaded housing, IP65 rated

The M4x0.5mm and M6x0.75mm bodies are stainless steel with IP65 ingress protection, suitable for factory-floor environments with dust and occasional splashes.

5ms response time, 100Hz switching frequency

Fast enough to catch small or fast-moving parts on a conveyor or indexing station without missing detections.

Precision electrical specs for reliable long-term operation

Less than 0.01mA leakage current, less than 1.5V voltage drop, less than 15% switching hysteresis, less than 5% repeatability, plus built-in short-circuit protection and a 180mA overload protection point.

Applications

Roller/laminator roll position detection — The bent structure allows installation and beam alignment in the tight space near roller/laminator shafts, and the 20m through-beam range works reliably within typical roller equipment mounting distances.

Tray presence/position detection on roller conveyors — The through-beam path can span the width of a roller conveyor to detect whether a tray is in position, with a 5ms response time able to keep up with the conveyor cycle.

Medical device (e.g. syringe/needle tube) position detection — The 1.5-2mm small spot can be aimed accurately at slender parts such as needle tubes, and the right-angle body allows side mounting next to a fixture.

Battery electrode coating gap/void inspection — The small laser spot can resolve gaps or uncoated voids on a coated electrode strip, suitable for multiple units mounted side by side for point-by-point scanning.

Battery cell/panel position accuracy check on conveyor — Multiple through-beam pairs can be arranged side by side along the line to confirm, point by point, whether flat workpieces are centered and in position.

Presence detection of material on food-processing equipment — A suspended through-beam arrangement confirms the presence of material piece by piece, suited to continuous processing lines that need item-by-item detection.

Small/thin part detection where diffuse sensors lack resolution — The standard 1.5-2mm small spot size gives it the resolving power to detect small or thin parts that a diffuse-reflective sensor of similar size cannot reliably distinguish.

Restricted-space installations where a straight-body sensor cannot be aimed — The 90° bent housing gives it a geometric mounting advantage over straight-body sensors in installation points with limited surrounding clearance.

Models & Ordering Information

M4x0.5mm right-angle through-beam (20m range)

DS0420N1DS0420P1DS0420N2DS0420P2

N1=NPN NO, P1=PNP NO, N2=NPN NC, P2=PNP NC. Through-beam type: emitter and receiver are sold and used as a matched pair.

M6x0.75mm right-angle through-beam (20m range)

DS0620N1DS0620P1DS0620N2DS0620P2

N1=NPN NO, P1=PNP NO, N2=NPN NC, P2=PNP NC. Through-beam type: emitter and receiver are sold and used as a matched pair.

How to Select

Choose M4x0.5mm (18.0mm overall length, 11.0mm threaded section) for smaller mounting hole positions.
Choose M6x0.75mm (20.0mm overall length, 14.0mm threaded section) for a coarser thread and a more secure mount where a slightly larger mounting hole is available.
Both M4 and M6 have a 20m detection range against the standard 100x100mm white paper test target; darker, less reflective, or transparent objects will reduce the usable distance, so consult the supplier for guidance on those cases.
For detecting finer or smaller parts, choose a smaller custom spot size (0.5mm or 1.0mm) rather than the standard 1.5mm (M4) or 2mm (M6) spot.
For a PLC with NPN (sinking) inputs, choose N1 (normally open) or N2 (normally closed).
For a PLC with PNP (sourcing) inputs, choose P1 (normally open) or P2 (normally closed).
If the output should turn ON when an object is detected, choose a normally-open (NO) model (suffix 1).
If the output should turn OFF when an object is detected (staying ON when no object is present), choose a normally-closed (NC) model (suffix 2).
Both M4 and M6 share a 10-30VDC supply voltage, a 150mA maximum load current, and a 180mA overload protection point with built-in short-circuit protection.
This is a through-beam type sensor: order the emitter and receiver together as a matched pair.

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

When NOT to specify the DS — and what to use instead

Only one side of the target is accessible for mounting

Why not: This is a through-beam pair: the emitter and receiver are sold and used together, facing each other across the detection gap.

Use instead: a laser diffuse model (e.g., a right-angle diffuse sensor) where only one mounting point is available

A span longer than 20m, or a target darker/less reflective than the white-paper test standard

Why not: The 20m range for both the M4 and M6 versions is measured against a standard 100x100mm white paper target; the spec notes that darker, less reflective, or transparent objects reduce the usable distance.

Use instead: the M12/M18 through-beam pair rated to 50m, or confirm dark/transparent-target performance with the factory first

A straight in-line mounting position with no clearance restriction behind the panel

Why not: This model's defining feature is its 90-degree bent stainless housing, which routes the cable sideways; that added geometry isn't needed when a straight body already fits.

Use instead: a straight-body M4/M6 through-beam sensor of the same thread size

Machine guarding or personnel-safety interlocking

Why not: The rich electrical/mechanical spec sheet (response time, hysteresis, leakage current, IP65) documents performance, not a safety-function certification.

Use instead: a dedicated safety light curtain for guarding, never this positioning switch

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.

Laser safety class (only 650nm wavelength is documented)
MTBF
Exact operating/storage temperature range
Certification (CE/UL/RoHS etc.)

Frequently Asked Questions

What is the detection range of the DS M4/M6 right-angle laser through-beam switch?

Both the M4 and M6 versions have a rated through-beam detection range of 20m, measured against the standard test target (a 100x100mm white paper board).

Do I need to order the emitter and receiver separately?

No - this is a through-beam (opposed) sensor, so the emitter and receiver are designed and sold as a matched pair used together across the detection gap.

What is the laser spot size, and can it be made smaller?

The M4 version has a standard spot of about 1.5mm, and the M6 version about 2mm. Both can be custom-ordered with a smaller 0.5mm or 1.0mm spot for finer detection of small parts.

What output types are available - NPN or PNP, NO or NC?

Four combinations are available for each thread size: NPN normally-open (N1), PNP normally-open (P1), NPN normally-closed (N2), and PNP normally-closed (P2).

What is the difference between the M4 and M6 versions?

The M4 uses an M4x0.5mm thread with an 18.0mm overall length and an 11.0mm threaded section; the M6 uses an M6x0.75mm thread with a 20.0mm overall length and a 14.0mm threaded section. Both have a 20m detection range and 10-30VDC supply; the M6 has a slightly larger standard spot size (~2mm vs ~1.5mm).

Does the detection distance change with the color or material of the object being detected?

Yes. Laser through-beam detection distance depends on the reflectivity, color, surface finish, and mounting angle of the target relative to the sensor. Brighter, more reflective, smoother objects allow longer detection distances; darker, less reflective, rougher objects shorten it. For detecting fully transparent objects, consult the supplier for guidance before purchase.

What is the response time and switching frequency?

The response time is 5ms and the maximum switching frequency is 100Hz.

What ingress protection rating and housing material does this sensor have?

IP65 ingress protection, with a stainless steel housing for both the M4 and M6 right-angle threaded bodies.

What is the cable specification?

A phi 3.0mm OD, 1.5m PVC cable with 3x0.15mm² conductors; on the sensor end, the emitter lead is a 3.0mm two-core wire of about 450mm and the receiver lead uses a 2.2mm cable of about 450mm before joining the main cable.

Can you provide certification documents for this sensor?

Certification documents are available on request.