Barrier gate access
Detects a vehicle at the gate with a 10–15 m through-beam pair.
Photoelectric · M18 cylindrical
LM18 Cylindrical Photoelectric Sensor
An M18 barrel sensor with 100 mm and 300 mm diffuse versions and 5, 10 and 15 m through-beam versions — IP67, 5 ms, NPN or PNP.
Model LMS18-R / LM18-T · Brand LE Raun · Category: Photoelectric Sensors
ThreadM18
Range100 mm – 15 m
Response≤5 ms
ProtectionIP67
Overview
The M18 barrel is the default mounting in industrial sensing: one 18 mm hole, two nuts, and the sensor is aimed. The LM18 range brings that mounting to photoelectric detection, with a diffuse version for one-sided access and through-beam versions reaching 15 m for gate and aisle applications.IP67 and a 5 ms response put it in the general-purpose bracket rather than the precision one. The diffuse models have an adjustable sensitivity so a threshold can be set against the actual target; the through-beam models are fixed, which is what you want when the object is opaque and the only question is whether the beam is broken.
Application scenarios
Logistics sorting lines
Confirms a parcel passed the diverter.
Production assembly lines
Detects a fixture at a station stop.
Door and shutter safety (non-safety)
Detects an obstruction in the door path.
Conveyor end-of-line
Detects product build-up at the discharge.
Industries
- Logistics
- Automotive
- Packaging
- General machinery
Technical specifications
| Models | LMS18-R10NO(C) / R10PO(C) / R30NO(C) / R30PO(C) diffuse · LM18-T500NO(C) / T500PO(C) / T1000NO(C) / T1000PO(C) / T1500NO(C) / T1500PO(C) through-beam |
|---|---|
| Sensing method | Diffuse reflection · through-beam |
| Sensing distance | 100 mm (R10) · 300 mm (R30) · 5 m (T500) · 10 m (T1000) · 15 m (T1500) |
| Indicator | Yellow LED (diffuse) · green LED transmitter / red LED receiver (through-beam) |
| Output mode | NPN or PNP open-collector |
| Switching mode | L-on (light-on) / D-on (dark-on), switchable |
| Response time / frequency | ≤ 5 ms |
| Light source | Infrared LED (940 nm) |
| Operating voltage | 12–24 VDC ±10% |
| Protection level | IP67 |
| Sensitivity adjustment | Adjustable (diffuse) · non-adjustable (through-beam) |
| Cable exit type | Cable output, 2 m |
| Product application | Applications: barrier gate access, logistics sorting lines, production assembly lines |
| Response time | ≤1 ms |
| Current consumption | ≤15 mA |
| Output current | ≤100 mA |
| Residual voltage | ≤1.5 V |
| Circuit protection | Short-circuit, reverse polarity, over-current |
| Ambient illumination | Incandescent ≤3,000 lux, sunlight ≤10,000 lux |
| Vibration / shock | 10–55 Hz 1.5 mm, 500 m/s² (X, Y, Z each 2 h) |
Dimensions
| Item | Value |
|---|---|
| Thread | M18 × 1 |
| Cable | 2 m, 3-core |
| Adjustment | Sensitivity potentiometer behind the rear cap on the diffuse types |
Wiring & output
| Lead | Colour |
|---|---|
| 2 | Blue |
| 3 | Black |
| 4 | White |
| — | Grey (5-wire types) |
How to specify
- 01
Choose the detection mode
Through-beam for the longest range and the most reliable operation in dust; retro-reflective for one-sided wiring over a few metres; diffuse for colour-independent presence at short range; background suppression where the conveyor or the machine frame sits behind the target.
- 02
Check the target and the background
A diffuse sensor sees the target, not the gap: a dark matt object halves the range. Background suppression types are set by distance, so the background must be at least 20 % further away than the target.
- 03
Match the light spot to the part
A 10 mm spot on a 2 mm wire gives a weak, unstable signal; choose a lens with a small spot at the working distance, or switch to a laser type.
- 04
Decide the output and the housing
NPN for Asian PLC inputs, PNP for European; 4-wire when the PLC needs both states. Square plastic for general use, stainless for washdown, fibre-optic where the space is too tight.
Why this series
Standard M18 mounting
One 18 mm hole and two nuts — no bracket design.
Up to 15 m through-beam
Covers barrier gates, aisle entries and wide conveyor gaps.
IP67
Rated for coolant, dust and washdown on general machinery.
Questions
What does the (C) suffix mean?
Cable output version. Models without it are connector versions.
Diffuse or through-beam?
Diffuse when only one side of the target is accessible; through-beam when both sides are free and the longest range or the most reliable switching is needed.
Can the sensitivity be adjusted?
Yes on the diffuse models; the through-beam models are fixed.
Need a quotation for LM18 Cylindrical?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.