Pallet and stack height
The 1 m version measures how high a pallet is loaded before the wrapper starts, regardless of the film colour.
M18 metal barrel · 300 mm / 500 mm / 1 m · straight or 90° elbow
Long-Range M18 Ultrasonic Sensors (LB300 / LB500 / LB1000)
Three M18 barrels covering 300 mm, 500 mm and 1 m, in straight and 90° elbow bodies, with switching, analog, RS485 and IO-Link outputs on the same platform.
Model LB300-18GM45 / LB500-18GM45 / LB1000-18GM55 · Brand LE Raun · Category: Ultrasonic Sensors
Range30 – 1000 mm
Resolution0.1 mm
Response22 – 52 ms
ProtectionIP67
Overview
The LB300 / LB500 / LB1000 family is the middle of the ultrasonic range: long enough to reach across a conveyor or into a tank, short enough that the M18 brass barrel still fits a standard mounting clamp. Resolution and response time degrade as the range grows, and the catalogue states both for each model.The switching variants are E2/E4 (one NPN), E3/E5 (one PNP), E6/E8 (two PNP) and E7/E9 (two NPN). The two-output versions are useful when the same sensor has to raise a warning at one distance and stop the machine at another — a hopper that is nearly full and then overflowing, for example.The analog and bus versions use I for 4–20 mA, U for 0–10 V, R4 for RS485 Modbus-RTU and IO for a push-pull output with IO-Link. The 90° elbow body (GM45E) is mechanically identical apart from the connector orientation, so the electrical specification does not change.
Application scenarios
Loop control on a web
The 300 mm version holds a dancer loop at a set depth; the analog output feeds the drive directly.
Tank and silo level
The 500 mm or 1 m version looks down into a tank and reports the fill height through foam and vapour that would defeat a float switch.
Vehicle and trailer detection
The 1 m version confirms that a trailer is present at a loading dock, in rain and in dirt.
Glass and clear-bottle counting
Detects transparent containers on a conveyor with no reflectivity requirement.
Industries
- Packaging
- Printing
- Food and beverage
- Automotive
Technical specifications
| Series | LB300 (300 mm) · LB500 (500 mm) · LB1000 (1000 mm) |
|---|---|
| Sensing range | 30–300 mm · 50–500 mm · 60–1000 mm |
| Blind zone | 0–30 mm · 0–50 mm · 0–60 mm |
| Resolution | 0.1 mm · 0.15 mm · 0.17 mm |
| Repeat accuracy | ±0.15 % of full-scale value |
| Response time | 22 ms · 32 ms · 52 ms |
| Switching frequency | 45 Hz · 31 Hz · 19 Hz |
| Switching output | E2/E4: 1 NPN, NO/NC · E3/E5: 1 PNP, NO/NC · E6/E8: 2 PNP, NO/NC · E7/E9: 2 NPN, NO/NC |
| Analog / bus output | I: 4–20 mA · U: 0–10 V · R4: RS485 Modbus-RTU · IO: push-pull, IO-Link |
| Body | Straight (GM45) or 90° elbow (GM45E) nickel-plated brass, M18 × 1, V1 connector |
| Operating voltage | 10–30 V DC |
| Ambient temperature | −25 to +70 °C (248–343 K) |
| Protection level | IP67 |
| Principle | Reflected sound pulse; distance from time of flight |
| Beam angle | 8° – 15° half-angle depending on the transducer diameter |
| Temperature compensation | Built in over the full operating range |
Dimensions
| Item | Value |
|---|---|
| LB1000 | 88.5 mm overall, 76.0 mm to the bend, 64.0 mm of thread |
| Elbow | 19.0 × 22.0 mm section on both |
| Barrel thread | M18 × 1 |
| Connector | M12 × 1 (V1) in the elbow face |
Measure from the sensing face to the bend, not to the connector: the elbow turns 90° and the cable then runs along the mounting surface, so the space behind the sensor is what usually decides the fit.
Wiring & output
| Lead | Colour |
|---|---|
| 2 | Blue |
| 3 | Black |
| 4 | White |
| 5 | Grey |
How to specify
- 01
Start from the range and the dead zone
Every ultrasonic sensor is blind for the first 30–100 mm. If the target comes closer than that, the reading jumps to the maximum — mount the sensor further back or choose a type with a shorter dead zone.
- 02
Check the sound cone against the tank
The cone is 8–15° half-angle: at 1 m a 15° cone is 500 mm across. In a narrow tank the walls answer instead of the liquid, which is why standpipes and stilling wells exist.
- 03
Match the target surface
Soft foam, felt and open-cell sponge absorb the pulse; a surface at 45° reflects it away. Cloth, liquid and granular material are the easy cases.
- 04
Choose the output
Analogue for level, RS485 for a bus of sensors, switching for a simple high/low limit. Add the synchronisation lead whenever two sensors can see the same surface.
Why this series
One body, three distances
The 300, 500 and 1000 mm versions share the M18 × 45 mm housing and the same V1 connector, so a machine can be specified in one go and re-ranged later without a new bracket.
A 90° elbow for tight corners
The GM45E body turns the connector through a right angle, which is what makes the sensor fit behind a guard rail or inside a frame where a straight barrel would foul.
Two switching outputs on the E6/E8 and E7/E9 versions
Two independent windows on one sensor — a warning window and a stop window — without a second device.
Questions
Why is the response time longer on the 1 m version?
An ultrasonic sensor has to wait for the echo to return before it can fire again. At 1 m the round trip is about 6 ms, so the measurement cycle — and therefore the response time — is inherently longer than at 300 mm.
Can it measure through a tank wall?
No. The beam has to travel through the air (or the liquid) to the surface. A closed metal tank needs a flanged transducer inside, or a window. Plastic tanks with a thin wall sometimes work, but the air gap and the wall thickness have to be tuned, so test before you commit.
What is the difference between the straight and the elbow body?
Only the connector exit angle. The GM45 is straight, the GM45E turns 90°. Both are M18 × 1, both are IP67, and the sensing performance is identical.
Need a quotation for Long-Range M18?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.