Level and fill height
Reads the distance to the surface of a bulk material in a silo or hopper.
Laser · Time-of-flight, square body
LTOF-R300N(P) Time-of-Flight Laser Sensor
A 3 m time-of-flight sensor in an IP67 square body: ±40 mm absolute accuracy, 1 ms response, distance read from the light's flight time rather than its inten
Model LTOF-R300N / R300P · Brand LE Raun · Category: Laser Sensors
Range0.03 – 3 m
Accuracy±40 mm
Response1 ms
ProtectionIP67
Overview
Time-of-flight measures how long the light takes to come back, so the reading depends on distance and not on how much light the target returns. A black rubber part at 2 m reads the same as a white one — which is exactly the failure mode of a triangulation sensor on a mixed-colour line.The cost is accuracy: ±40 mm absolute against ±5 mm repeat. That is fine for presence, level and collision-avoidance work, and not fine for dimensional measurement — for that, use the measuring light curtain or the 3D profile scanner. IP67 and a 1 ms response put it in the general-purpose bracket on a machine frame.
Application scenarios
Collision avoidance on AGVs
Detects an obstacle in the travel path at up to 3 m.
Mixed-colour part presence
Detects black and white parts on the same line without re-teaching.
Pallet and stack height
Measures the top of a stack before the fork enters.
Roll diameter monitoring
Tracks the decreasing diameter of an unwinding roll.
Industries
- Logistics
- Packaging
- Automotive
- Material handling
Technical specifications
| Model | LTOF-R300N(P) |
|---|---|
| Detection method | Diffuse reflection (time-of-flight) |
| Detection distance | 0.03–1.5 m @ 10 % reflectivity · 0.03–3 m @ 80 % reflectivity |
| Absolute accuracy | ± 40 mm |
| Repeat accuracy | ± 5 mm |
| Output mode | Output indicator: orange · operation indicator: green |
| Response time | 1 ms |
| Light source | Laser diode, 650 nm, < 1 mW |
| Laser class | Class 1 |
| Sensitivity adjustment | One-touch setting type |
| Protection level | IP67 |
| Power consumption | < 0.6 W |
| Operating voltage | 9–30 V DC ±10% |
| Spot size | 0.5 – 2 mm at the working distance, depending on model |
| Circuit protection | Short-circuit, reverse polarity, over-current |
Dimensions
| Item | Value |
|---|---|
| Mounting holes | 2 × M3, 25.0 mm pitch |
| Cable | 2 m, 3-core |
| Weight |
Wiring & output
| Lead | Colour |
|---|---|
| 2 | Blue |
| 3 | Black |
| 4 | White |
| — | Grey |
How to specify
- 01
Choose the measuring principle
Through-beam for the longest range and the sharpest edge; retro-reflective for one-sided wiring; diffuse with background suppression where the object must be distinguished from the machine frame; time-of-flight where the range exceeds a few metres.
- 02
Check the spot at the working distance
The spot grows with distance: a 1 mm spot at 300 mm may be 5 mm at 2 m. For a thin wire or a small hole, choose a model with a small spot at that specific distance.
- 03
Decide digital or analogue
A switching output answers 'is it there'; an analogue or RS-485 output answers 'where is it'. Positioning tasks need the analogue or the serial version, not a teach-in threshold.
- 04
Allow for the surface
Shiny, black or transparent targets change the received power; the BGS types are set on distance rather than on intensity, which is why they hold on a black part against a bright background.
Why this series
Distance, not intensity
Black, white and shiny targets at the same distance read the same.
3 m in a square body
Longer range than any triangulation sensor of the same size.
IP67 and 1 ms
Sealed for washdown and fast enough for a moving target.
Questions
Why is the accuracy only ±40 mm?
TOF trades accuracy for independence from target colour and reflectivity. If you need ±1 mm, use a laser displacement sensor instead.
Does it work through dust?
Better than a triangulation sensor, because it measures time rather than position — but heavy dust still attenuates the beam.
What is the 10 % / 80 % reflectivity figure?
The guaranteed range for a dark target (10 %) and a white one (80 %). A matt black surface halves the usable range.
Need a quotation for LTOF-R300N(P) Time-of-Flight?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.