Label and gap detection on labellers
Clamps over the web to fire the label applicator on the gap between labels.
Photoelectric · Slot type, 5 / 6 mm
Slot-Type Photoelectric Sensor (EU-25 / 45 / 65 / SX67 / 67A)
A fork-shaped photoelectric sensor in five housing families and 24 variants: 5 mm slot (6 mm on EU-65), 0.03 mm repeat accuracy and 2 kHz response for label
Model EU-25 / 45 / 65 / SX67 / 67A · Brand LE Raun · Category: Photoelectric Sensors
Slot width5 mm / 6 mm
Response2 kHz
OutputNPN / PNP
ProtectionIP65
Overview
A slot sensor is the cheapest way to detect something that passes a fixed point: the emitter and receiver face each other across a 5 mm gap, so the object only has to interrupt the beam. There is no reflector to align, no sensitivity to set, and no ambient-light problem — the detection is binary and repeatable to 0.03 mm.The five sub-series differ only in housing shape and cable exit. EU-25 (1 m cable), EU-45 (2 m cable) and EU-65 (6 mm slot, mating cable) cover in-line mounting; EU-SX67 adds a protective rib and a bracket-mount variant for machine frames; EU-67A replaces the cable with a 4-core connector for tooling that is swapped regularly. All of them switch 2 kHz, so a 1,200-part-per-minute line does not outrun the sensor.
Application scenarios
Cam and limit position on rotary machines
Counts the teeth of a cam wheel to give one pulse per index.
Small-part counting on vibratory feeders
Counts pins, caps and clips as they pass the track without contact.
Needle and thread detection on sewing equipment
Detects thread presence at the needle.
End-of-travel on pneumatic actuators
Replaces a mechanical limit switch where the actuator stroke is short.
Industries
- Packaging
- Electronics
- Textile
- General machinery
Technical specifications
| Model | 24 variants across EU-25, EU-45, EU-65, EU-SX67 and EU-67A |
|---|---|
| Slot width | 5 mm (EU-25 / EU-45 / EU-SX67 / EU-67A) · 6 mm (EU-65) |
| Standard test object | 1.2 × 2.0 mm opaque object |
| Repeat accuracy | < 0.03 mm |
| Output mode | NPN or PNP open-collector |
| Operation mode | L.on / D.on switchable |
| Response frequency | 2 kHz |
| Light source | Infrared LED (940 nm) |
| Operating voltage | 12–24 VDC ±10% |
| Protection level | IP65 |
| Cable exit | 1 m 4-core (EU-25) · 2 m 4-core (EU-45 / EU-SX67) · 4-core mating cable (EU-65 / EU-67A) |
| Product application | Home positioning, limit position, counting |
| 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 |
|---|---|
| T body | 13.8 mm wide × 28.1 mm high, 9.6 mm slot |
| R body | 14 mm wide × 22.8 mm high, 5.2 mm slot |
| L body | 28.5 mm wide × 20.0 mm high, 10.6 mm slot |
| K / Y body | 25.5 mm / 14 mm wide, 5 mm slot |
| Mounting | Ø3.2 mm through-holes on the body centre line |
Six bodies, one amplifier family: pick the body by the slot width the part needs, not by the sensing distance — every type uses the same 4-core cable and the same NPN / PNP options.
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
0.03 mm repeat accuracy
Detects the leading edge of a label or the tooth of a cam with enough margin to run at line speed.
24 housing variants
K, L, F, R, U, T and Y shapes plus top, side and bracket mounts — the sensor fits the machine instead of the machine being re-machined.
2 kHz switching
A 0.5 ms period, so short parts and narrow gaps are not missed.
Questions
Why a slot sensor instead of a diffuse sensor?
Because the object is small and passes a fixed point. A fork sensor needs no adjustment and cannot be fooled by a reflective background.
Does it work with transparent labels?
The slot type detects an opaque object interrupting the beam. For transparent films use the capacitive label sensor (EU1000) or a transparent-object detector.
What is the difference between EU-25, EU-45 and EU-65?
Slot width and cable: EU-25 and EU-45 have a 5 mm slot with 1 m and 2 m cable respectively, EU-65 has a 6 mm slot and a mating cable connector.
Need a quotation for Slot-Type Photoelectric?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.