Stacker crane height
Reads the fork height up an AS/RS aisle to 20 m with 4–20 mA output.
Laser · Time-of-flight, long range
LTOF Long-Range Time-of-Flight Laser Sensors
TOF laser sensors from 0.05 m to 20 m with NPN/PNP, 4–20 mA and optional RS485 output — for cranes, stacker cranes, vehicles and large workpieces.
Model LTOF-R500 / R1000 / JG50 / JG100 / JG200 · Brand LE Raun · Category: Laser Sensors
Range0.05 – 20 m
InterfaceNPN/PNP · 4–20 mA · RS485
Laser classClass 1
ProtectionIP65
Overview
Two families cover the long end of the range. The R series (500 and 1,000) is the accurate one: ±30 mm below 5 m, running to 10.2 m on a white target, with a switchable response time from 1 ms to 1 s so the reading can be averaged on a vibrating structure. The JG series goes to 20 m at ±6 cm — enough for a crane or a stacker crane position, not enough for a measurement.The I/U/R suffix selects the interface: NPN, 4–20 mA or RS485. The analogue output is the useful one for a stacker crane — the PLC reads a continuous height rather than counting pulses — and RS485 allows several sensors on one bus down an aisle.
Application scenarios
Overhead crane positioning
Measures the distance to the load or the end stop.
Vehicle and container position
Detects a truck or container at a loading bay.
Silo and bunker level
Reads the surface of bulk material through dust.
Large workpiece position
Detects a steel plate or a weldment before a robot cycle.
Industries
- Logistics
- Steel
- Material handling
- Automotive
Technical specifications
| Models | LTOF-R500N(I/U/R) · LTOF-R1000N(I/U/R) · LTOF-JG50-N(I/U/R) · LTOF-JG100-N(I/U/R) · LTOF-JG200-N(I/U/R) |
|---|---|
| Detection method | Diffuse reflection (time-of-flight) |
| Detection distance | 0.05–5.2 m @ 10 % (R500) · 0.05–10.2 m @ 80 % (R1000) · 5 m (JG50) · 10 m (JG100) · 20 m (JG200) |
| Absolute accuracy | ± 30 mm below 5 m, 1 % above 5 m (R series) · ± 6 cm below 6 m, ± 1 % above 6 m (JG series) |
| Repeat accuracy | ± 5 mm (R series) · ± 20 mm below 6 m, ± 0.5 % above 6 m (JG series) |
| Output mode | NPN and PNP · 4–20 mA · RS485 (optional) |
| Response time | ≤ 1 ms / 1.5 ms / 10 ms / 100 ms / 1,000 ms switchable (R series) · 20 ms (JG) |
| Light source | Laser diode, 650 nm, < 1.5 mW |
| Laser class | Class 1 |
| Sensitivity adjustment | One-touch setting type |
| Protection level | IP65 |
| Power consumption | < 0.6 W (R series) · < 0.9 W (JG series) |
| Operating voltage | 9–30 V DC ±10% (R series) · DC 12–24 V ±10% (JG series) |
| 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 × Ø3.0 mm |
| Display | OLED, visible from the top face |
| Cable | 2 m |
The long-range LTOF is a metal-bodied unit with an OLED display: the 5 / 10 / 20 m versions share the same 44 × 26.5 × 23 mm envelope, so a bracket designed for one takes the others.
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
Up to 20 m
Covers an aisle, a crane travel or a silo depth with one sensor.
4–20 mA and RS485
Continuous distance to the PLC, or several sensors on one bus.
Switchable response
1 ms for a moving target, 1 s averaging for a vibrating structure.
Questions
R series or JG series?
R for accuracy over 5–10 m, JG for 20 m where ±6 cm is acceptable.
What do I, U and R mean in the model code?
The interface: I = 4–20 mA, U = NPN/PNP switching, R = RS485.
Can it measure through dust?
It tolerates more dust than a triangulation sensor, but a silo with heavy airborne dust needs a radar or an acoustic sensor.
Need a quotation for LTOF Long-Range?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.