Chip presence under a tool
LEWY-F1.5 through a 2 mm hole in the fixture plate at 30 mm, Ø1 mm spot. The plain tip is glued into the plate and never moves.
Ø1.5 – Ø5 mm · 15 – 180 mm · glass-fiber bundle
Diffuse Fiber Optic Units
Thirteen diffuse units in one table: plain Ø1.5, 2, 3 and 5 mm tips for a drilled hole, M3 threaded bodies with a replaceable Ø0.9 or Ø1.5 mm tip, side-view
Model LEWY-F1.5 · LEWY-F2.0 · LEWY-F3.0 · LEWY-F5.0 · LERE-M310 · LERC-M310 · Brand LE Raun · Category: Fiber Optic Sensors
Sensing15 – 180 mm
TipsØ1.5 – Ø5 mm
Bend radiusR10 – R25
Temperature−50 to +70 °C
Overview
A fiber unit is a light pipe: it carries the amplifier's LED to the measuring point and the returning light back. Its two numbers — the core diameter and the bend radius — decide whether the amplifier sees enough light to switch reliably. Everything else in the table is packaging.The plain LEWY types are the low-cost route into a drilled hole or a machined slot. The threaded M3 types (LERE / LERS / LERC) add two nuts and a repeatable position, which matters as soon as a fixture is changed over. The coaxial LERC is the specialist: it looks down a bore, a nozzle or a drilled block where a side-by-side emitter and receiver would only see the wall.All of them are rated for −50 to +70 °C at the fiber, which covers a machine frame but not an oven — for that, the stainless units in the high-temperature family go to 350 °C.
Application scenarios
Bore depth in a machined block
LERC-M310 coaxial, 60 mm, looking down the bore. The nine outer cores light the wall evenly and the centre core reads the bottom face.
Label on a curved bottle
LEWY-F5.0 at 180 mm with a Ø5 mm spot, amplifier in area mode — the curvature no longer breaks the return light.
Part clamped against a stop
LERS-M310TZ right-angle in an M3 tapped hole in the clamp body, beam parallel to the locating face, 50 mm to the part.
Industries
- Machine tools
- Electronics assembly
- Packaging
- Medical devices
Technical specifications
| Type | Diffuse (reflective) fiber unit — one fiber bundle, emitter and receiver in the same tip |
|---|---|
| Amplifier | Any LE or LG series amplifier in this chapter |
| Fiber length | 1 m standard; 1000 / 2000 mm to order |
| Sensing distance | 15 mm (LERE-M310) to 180 mm (LEWY-F5.0 / F5.05) |
| Tip diameter | Ø1.5 / Ø2.0 / Ø3.0 / Ø5.0 mm plain · Ø0.9 / Ø1.5 mm replaceable on the threaded types |
| Thread | M3P0.25 (LERE-M310) · M3P0.5 (LERS / LERC) · none on the LEWY plain types |
| Bend radius | R10 / R15 / R25 depending on the jacket |
| Ambient temperature | −50 to +70 °C at the fiber, −20 to +55 °C at the amplifier |
| Jacket | Stainless spiral armour on the threaded types, PVC on the plain types |
| Repeatability | Set by the amplifier, not by the unit |
Dimensions
| Item | Value |
|---|---|
| Jacket diameter at the amplifier end | Ø2.2 mm, fork terminal |
| Tip extension | Ø0.9 mm × 10 / 20 / 40 / 90 mm on the threaded types (replaceable tip) |
| Thread length | 13 mm (M3 types) · 12.7 mm total body on the right-angle types |
| Right-angle head | 7 mm across flats, 5.8 mm to the fiber axis |
| Mounting | Two M3 nuts on the threaded body, or a clamp on the plain tip |
Sensing distance is quoted against a white 100 × 100 mm target at the stated amplifier gain. A dark or angled target reduces it by 30–60 %.
Wiring & output
| Core | Colour |
|---|---|
| 2 | Blue |
| 3 | Black |
| 4 | White |
How to specify
- 01
Diffuse or through-beam — can the part reflect?
A diffuse unit needs return light from the part itself: matt, at least 3 mm across, within 180 mm. A wire, a transparent film or a part further away needs a through-beam pair.
- 02
Tip diameter sets the spot
Ø0.9 mm tip for a 1 mm feature, Ø1.5 mm for general presence, Ø5 mm when the part position varies. The tip decides the spot; the amplifier only decides the threshold.
- 03
Thread or plain
A threaded M3 body with two nuts gives 0.1 mm adjustment and a repeatable position after a changeover. The plain tips (LEWY) are for a drilled hole or a glued-in place where there is no room for nuts.
- 04
Then the bend radius
R10 units are the thin-jacket ones — they will follow a 10 mm radius but lose light on a tight coil. In a drag chain, take R25.
Why this series
Thirteen units, one amplifier
Every unit in the table plugs into the same Ø4 mm port, so a machine can start with a plain Ø1.5 mm tip and change to a threaded M3 body without touching the wiring.
A coaxial type for a bore
LERC-M310 sends and receives along the same axis through nine Ø0.25 mm cores around one Ø0.5 mm core. It is the only type that sees the bottom of a 6 mm bore without seeing the wall.
Replaceable tips
The threaded types take Ø0.9 or Ø1.5 mm tips in 10, 20, 40 and 90 mm lengths — the same body reaches deeper into a fixture by changing a tip, not by re-routing the fiber.
Right-angle heads
The TZ versions turn the beam 90° in 5.8 mm, which is what a fixture with a part travelling parallel to the mounting face needs.
Questions
Why is my sensing distance half the catalogue value?
The catalogue value is measured on a white 100 × 100 mm target. A black, matt or angled part returns a fraction of that light. Use the catalogue figure to compare units, then teach on the real part.
Can I shorten the fiber?
No. Both ends are terminated and polished; cutting one end destroys the unit. Order the length you need — 1 m and 2 m are standard.
What is a coaxial unit for?
Looking into a bore or a narrow channel. Side-by-side fibers see the wall before they see the bottom; a coaxial unit puts the emitter ring around the receiver so the wall is lit evenly.
Need a quotation for Diffuse Fiber?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.