DDK-F Long-range Laser Distance Sensor

Pulsed TOF laser distance sensor with up to 200 m range, stated fog/snow accuracy, IP67 and -30 to +60°C.

Technical Specifications

Measuring principle	Pulsed time-of-flight (pulsed TOF)
Output	4-20mA analog + RS485 Modbus RTU + 4-channel independent NPN/PNP alarm output
Range (standard version)	1-150m @ 50Hz
Range (high-rate version)	1-200m @ 100Hz
Accuracy	±3cm @100m clear weather / ±10cm fog and snow
Laser	905nm, Class 1
Operating voltage	DC9-30V
Protection rating	IP67
Operating temperature	-30 ~ +60°C

Overview

The DDK-F is a long-range laser distance sensor using pulsed time-of-flight (TOF) measurement, available in a standard version (1-150 m at 50 Hz) and a high-rate version (1-200 m at 100 Hz). It is designed for outdoor and industrial installations that need distance measurement over long spans with simultaneous analog, bus, and switch outputs, such as port equipment operators, bulk material handling integrators, and crane/hoist system builders requiring multi-stage anti-collision alarms in a single sensor.

The sensor delivers stated accuracy of ±3 cm at 100 m in clear conditions and ±10 cm in fog and snow, operates from -30 to +60°C with IP67 protection, and outputs 4-20 mA analog, RS-485 Modbus RTU, and four independently configurable NPN/PNP alarm channels simultaneously from a single DC 9-30 V powered unit.

Features & Benefits

Longest Range in Our Laser Distance Line

Pulsed TOF ranging covers 1-150 m at 50 Hz in the standard version and 1-200 m at 100 Hz in the high-rate version — the longest measuring range of any laser distance model in our current lineup.

All-weather Accuracy, Stated in Fog and Snow

Accuracy is ±3 cm at 100 m in clear conditions and ±10 cm in fog and snow, across a -30 to +60°C operating range with IP67 protection. Many datasheets publish only clear-weather figures; this model states a separate fog/snow accuracy number.

Four Independently Configurable NPN/PNP Alarm Outputs

Four discrete alarm channels build a multi-stage warning sequence — alert, slow-down, stop, limit — at the sensor level, reducing the comparator logic otherwise needed in the PLC. NPN/PNP compatibility supports both Japanese- and European-style control systems.

Three Output Types on One Device

The distance value is available simultaneously as 4-20 mA analog (for legacy systems) and RS-485 Modbus RTU (for modern systems), while alarms run on independent discrete outputs — useful when retrofitting a mixed old/new control system.

Eye-safe Class 1 Laser Even at Long Range

The 905 nm pulsed laser remains Class 1 (eye-safe) at maximum operating range, so no laser safety exclusion zone is required around personnel-accessible areas.

Wide 9-30 V DC Supply for Vehicles and Mobile Equipment

Runs directly from 12 V or 24 V vehicle or mobile-equipment power rails without an external regulator, matched with IP67 and a -30 to +60°C rating for mobile machinery installation.

Applications

Anti-collision Monitoring for Large-travel Crane Systems — Multi-stage alarm outputs (up to 4 channels) plus a 200 m measuring range fit the multi-zone warning distances needed for gantry/travel crane anti-collision.

Position Monitoring for Stacker/Reclaimer Machines in Open Stockyards — Stated fog/snow accuracy and -30 to +60°C operation support outdoor stockyard use where visibility and temperature vary.

Port Machinery Large-travel Positioning — IP67, wide operating temperature, and 9-30 V DC supply fit exposed, vibration-prone installations on quay cranes, yard cranes, and ship loaders.

Long-distance Level or Position Monitoring with 4-20 mA / Modbus Upload — Simultaneous analog and Modbus RTU output allow integration with both legacy analog systems and modern bus-based SCADA/PLC systems.

Vehicle or Mobile-machinery Proximity Monitoring in Tunnels and Mining Sites — Wide 9-30 V DC input and IP67 rating suit installation directly on mobile vehicles or machinery running on 12/24 V power.

Retrofit Projects Mixing Legacy Analog and New Bus-based Control — The 4-20 mA + Modbus RTU dual output lets the sensor bridge older analog-only systems and newer Modbus-capable systems during a transition period.

Models & Ordering Information

DDK-F Series

DDK-F

Standard version: 1-150 m @ 50 Hz. High-rate version: 1-200 m @ 100 Hz. Version-specific order codes are not yet documented; confirm with factory.

How to Select

Choose the standard version if you need 1-150 m range at a 50 Hz update rate.
Choose the high-rate version if you need up to 1-200 m range or a 100 Hz update rate.
Use the 4-20 mA output to connect to existing analog instruments or PLCs.
Use the RS-485 Modbus RTU output to connect to a Modbus bus-based control system.
Use the four independent NPN/PNP alarm outputs to drive indicator lights, buzzers, relays, or a multi-stage warning interlock directly, selecting NPN or PNP to match your controller type.
All three output types (analog, Modbus RTU, and alarm outputs) can be used simultaneously.
IP67 protection covers standard outdoor, dusty, and damp environments.
Check that local extreme temperatures fall within the -30 to +60°C operating range for cold or hot climates.
In areas with frequent fog or snow, confirm that the ±10 cm fog/snow accuracy meets your application tolerance.
For applications requiring better-than-centimeter accuracy within 100 m, consider our phase-shift products (e.g. DDA-Y/DDB-Y) instead; the DDK-F is a pulsed-TOF model suited to long range and all-weather operation rather than maximum precision.
For vehicles or mobile equipment running on 12 V or 24 V power, the DC 9-30 V wide input range connects directly without extra voltage regulation.

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

When NOT to specify the DDK-F — and what to use instead

The application needs millimeter or sub-centimeter accuracy within a 100 m range.

Why not: DDK-F's stated accuracy is ±3 cm at 100 m in clear weather, widening to ±10 cm in fog and snow — a centimeter-class figure, not millimeter-class.

Use instead: a phase-shift laser distance sensor such as DDA-Y/DDB-Y for millimeter-class accuracy within their own rated range

The target sits closer than 1 m from the sensor.

Why not: both the standard version (1-150 m @ 50 Hz) and high-rate version (1-200 m @ 100 Hz) rate their minimum measuring distance at 1 m; no sub-1 m performance is published.

Use instead: a laser displacement sensor built for short-range, near-field measurement

The task is micron-level thickness or displacement measurement rather than long-range ranging.

Why not: DDK-F publishes only centimeter-class ranging accuracy (±3 cm/±10 cm) with no repeatability or resolution figure suited to fine dimensional work.

Use instead: a laser displacement (triangulation) sensor rated in micron repeatability

The project needs documented laser-safety evidence for a regulatory or personnel-safety review, not just a nameplate class.

Why not: only "905 nm, Class 1" is stated for DDK-F; no supporting laser test report, certification document, or enclosure/dimensional data is published alongside it.

Use instead: requesting the factory's laser test report and certification file before specifying it in a personnel-accessible or regulated installation

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.

Repeatability and resolution figures for the distance reading are not published
Outline dimensions, housing material, and connector type are not published
Configuration method for the four independent alarm output channels (button, DIP switch, or Modbus register write) is not documented
Test conditions (target reflectance, measurement distance) behind the stated ±10 cm fog/snow accuracy figure are not documented
Order-code suffixes distinguishing the standard (1-150 m/50 Hz) and high-rate (1-200 m/100 Hz) versions are not documented
Certification documents (CE/FCC/RoHS) are not yet available
Modbus RTU register map and supported baud-rate range are not documented
Availability and lead time of this exact spec combination — confirm with us before you design it in

Frequently Asked Questions

What is the maximum measuring range of the DDK-F laser distance sensor?

The standard version measures 1-150 m at a 50 Hz update rate; the high-rate version measures 1-200 m at 100 Hz.

How accurate is the DDK-F, and does accuracy change in bad weather?

Stated accuracy is ±3 cm at 100 m under clear conditions, and ±10 cm in fog and snow conditions.

What is the measuring principle used by the DDK-F?

Pulsed time-of-flight (pulsed TOF) laser ranging.

What outputs does the DDK-F provide?

A 4-20 mA analog output, an RS-485 Modbus RTU output, and four independently configurable NPN/PNP discrete alarm outputs — all available simultaneously on the same unit.

Is the DDK-F laser safe for use around personnel?

It uses a 905 nm pulsed laser classified as Class 1 (eye-safe), including at maximum operating range.

What power supply does the DDK-F require?

DC 9-30 V, wide enough to run directly from 12 V or 24 V vehicle or mobile-equipment power.

What is the environmental protection rating and operating temperature range?

IP67 ingress protection, with an operating temperature range of -30 to +60°C.

How many alarm output channels does the DDK-F have, and can each be set independently?

Four discrete alarm output channels, each independently configurable, supporting multi-stage warning sequences such as alert / slow-down / stop / limit.

Can the DDK-F be used for outdoor crane anti-collision applications?

Its long range (up to 200 m), IP67 rating, wide operating temperature (-30 to +60°C), and stated fog/snow accuracy make it suited to outdoor long-travel anti-collision monitoring on cranes and similar equipment; this is a typical application based on its published specifications, not a documented customer case.

Works Well Together

On the same machine or line, DDK-F is typically ordered together with: Relay & Timer Modules · Laser Displacement Sensors · LiDAR Scanners

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