Low openings
Closes the reachable gap between the lowest beam and the machine table.
Safety Light Curtain · No Blind Zone Type
LE-H Series Safety Light Curtain (No Blind Zone Type)
A 28 × 28 mm no-blind-zone light curtain: the first beam sits at the very end of the profile, so the guard reaches the machine surface with no unprotected ga
Model LE-H Series · Brand LE Raun · Category: Safety Light Curtains
Sectional size28 × 28 mm
Beam placementno blind zone
Protective height135–2992 mm
Detection distance0.01–3 m to 0.01–30 m
Overview
The LE-H Series is the no-blind-zone model. The optical array is taken right out to the ends of the 28 × 28 mm housing, so there is no unprotected band between the first beam and the machine surface — a detail that matters on small machines where a conventional curtain leaves a reachable gap.Protective heights start at 135 mm and run to 2992 mm, with 6–292 beams and 10/20/40 mm pitch. Detection distance options run 0.01–3 m, 0.01–5 m, 0.01–10 m, 0.01–20 m and 0.01–30 m, supply 10–30 VDC, output NPN, PNP or relay, synchronization optical or line, protection IP65 with IP67 optional.
Application scenarios
Small assembly machines
Where a conventional curtain leaves a hand-sized band at table height.
Packaging infeed with short guards
No dead band at the bottom of a short guard.
Laboratory and medical equipment
Protects drawers and small openings that sit close to the working surface.
Machine beds with limited headroom
Beams start at the mounting surface, so no spacer is needed.
Industries
- Machine tools
- Packaging
- Laboratory
- Medical
Technical specifications
| Model | LE-H Series |
|---|---|
| Sectional size | 28 × 28 mm |
| Beam number | 6–292 beams (standard) |
| Protective height | 135–2992 mm (standard) |
| Detection distance | 0.01–3 m / 0.01–5 m / 0.01–10 m / 0.01–20 m / 0.01–30 m |
| Beam pitch | 10 / 20 / 40 mm |
| Supply voltage | 10–30 VDC |
| Signal output | NPN / PNP / Relay (optional) |
| Sync type | Optical / line synchronization (optional) |
| Response time | ≤10 ms |
| Protection level | IP65 / IP67 (optional) |
| Light curtain form | Through-beam type |
| Product application | All kinds of automation equipment, jig equipment, packaging machines, food machinery, 3C semiconductor equipment, photovoltaic equipment, lithium equipment, new energy equipment, medical equipment. |
| Ambient light immunity | Incandescent ≤1000 lux, sunlight ≤10000 lux |
| Circuit protection | Reverse polarity, output short-circuit |
| Power consumption | 3–8 W |
| Operating temperature | −25 to +70 °C operating, −40 to +80 °C storage |
| Max load current | 100 mA (OSSD) |
Dimensions
| Item | Value |
|---|---|
| Beam pitch | 10 / 20 / 40 mm (no-blind-zone design) |
| Effective height | beam count × pitch − pitch (140 – 2920 mm) |
| Dead bands | ≈ 12.5 mm lower / 12.5 mm upper across the pitch range |
| Detection distance | 0.01 – 3 / 8 / 10 / 20 m options |
| Mounting | 2 × Ø4.5 through holes; M12 connector |
The dead band is held at about 12.5 mm regardless of pitch, so the lowest beam sits close to the machine table — that is the point of the series, and it is what lets it guard short openings a standard curtain misses.
Wiring & output
| Lead | Colour |
|---|---|
| 2 | Blue |
| 3 | Black |
| 4 | White |
| 5 | Shield / drain |
How to specify
- 01
Pick the detection capability
Finger protection is Φ15 mm with a 10 mm beam pitch; hand protection Φ25 mm at 20 mm; arm and body detection Φ35 mm at 30 mm; whole-body detection Φ45 mm at 40 mm. The finer the pitch, the closer the operator may stand to the hazard.
- 02
Check how far the hazard is
Where the operator cannot reach the danger zone before the curtain responds, a coarser pitch is acceptable. Where the reach-over distance is short, step down one pitch class — this is the single decision that most often changes the model.
- 03
Choose the profile
30 × 30 mm general-purpose, 35 × 40 mm long range, 32 × 20 mm front slim, 25 × 12 mm front ultra-slim, 10 × 22 mm side ultra-slim, 28 × 28 mm no-blind-zone. The profile is set by the space around the opening, not by the electrical specification.
- 04
Set the protective height
Beam count N and pitch define the effective height: B = N × pitch − pitch. Overall housing length A = B + D + E, where D and E are the lower and upper dead zones including the end caps. Choose the next size up rather than leaving part of the opening unguarded.
- 05
Choose output, sync and connection
NPN or PNP, normally-open or normally-closed, in four combinations. Optical synchronisation needs no link wire (5-wire); line synchronisation is immune to cross-talk between adjacent curtains (7-wire). Cable gland or M12 connector at order.
- 06
Confirm the working distance
Standard series align over 0.1–8 m; the long-range series reaches 25–30 m. Check the emitter/receiver pairing table before ordering a mixed set — not every series can be cross-paired.
Why this series
No blind zone
Beams run to the end caps, so there is no dead band at the bottom or top of the curtain — the gap between the lowest beam and the machine bed is closed.
135 mm minimum height
The shortest configuration starts at 135 mm and runs to 2992 mm, covering both low openings and full-body access.
28 × 28 mm section
A compact square profile that mounts on standard brackets and keeps the optical axis stable.
Questions
What does “no blind zone” actually mean?
On a conventional curtain the end caps and the first beam leave a short unprotected band at each end of the profile. The LE-H places beams at the extremity of the housing, so the protected field starts at the mounting surface.
When is the LE-H the right choice?
Wherever an operator could reach through the gap between the lowest beam and the machine table — small assembly machines, packaging infeeds, and openings where the curtain cannot be sunk into the frame.
Is the response time affected?
No. Response time remains ≤10 ms, the same as the other series.
Need a quotation for LE-H Series?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.