High-speed ejection
Triggers a reject valve within 50 µs of the part arriving.
Photoelectric · Digital display
LFH-S Digital-Display Photoelectric Sensor
A diffuse sensor with a four-digit display for setup and run-time monitoring: 1,000 mm spot or 500 mm line spot, 50 µs response and IP66.
Model LFH-S1000N(P) / S150N(P)A · Brand LE Raun · Category: Photoelectric Sensors
Range1,000 mm / 500 mm
Response50 µs
Display4-digit
ProtectionIP66
Overview
The display is the point of this sensor. A four-digit readout shows the received light intensity while the machine runs, so a threshold that starts to drift — dirty lens, ageing LED, a target that changed colour — is visible as a number before it becomes a stopped line. Setup is done against that number instead of a potentiometer screw.Two optics are offered: a spot version reaching 1,000 mm for general presence detection, and a line-spot version at 500 mm for edge and width detection. At 50 µs the response is fast enough for a flying cut or a high-speed eject, and IP66 covers coolant splash and washdown.
Application scenarios
Web edge and width
The line-spot version reads the edge of a moving web.
Machine tool limit
Non-contact replacement for a mechanical limit switch on a slide.
Assembly station verification
Confirms the right part in the fixture before the cycle starts.
Conveyor jam detection
Watches a transfer point where parts queue.
Industries
- Automotive
- Electronics
- Machine tools
- Packaging
Technical specifications
| Model | LFH-S1000N(P) — spot light · LFH-S150N(P)A — line spot |
|---|---|
| Sensing method | Diffuse reflection type |
| Sensing distance | 1,000 mm (S1000) · 500 mm (S150A) |
| Output logic | LIGHT-ON / DARK-ON (switchable) |
| Output | 1 output |
| Current consumption | ≤ 20 mA |
| Response time / frequency | 50 µs |
| Light source | Infrared LED (624 nm) |
| Operating voltage | 12–24 V DC ±10% |
| Protection level | IP66 |
| Cable exit type | Cable-out type, 2 m, 3-core cable |
| Product application | Industrial conveyor belts, machine tool limit switches, automation equipment, automatic assembly machines and other working scenarios |
| Response time | ≤1 ms |
| 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 |
|---|---|
| Mounting holes | 2 × Ø3.4 mm, 25.5 mm pitch |
| Display | 4-digit red LED, visible from the top face |
| Cable | 2 m, 3-core |
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
Four-digit intensity display
Threshold set and monitored as a number, so drift is caught before it stops the line.
50 µs response
Fast enough for flying cuts, high-speed ejection and small gaps.
Spot or line optics
A round spot for presence, a line spot for edges and widths.
Questions
Why pay for a display?
Because most photoelectric faults are threshold faults. A numeric readout turns a two-hour diagnosis into a ten-second one.
What is a line spot for?
Detecting edges, widths and objects that do not arrive in a repeatable position — a round spot would miss a thin target off-centre.
Is IP66 enough for washdown?
It handles splash and hose spray. For continuous immersion or high-pressure cleaning, use an IP67/IP68 rated sensor.
Need a quotation for LFH-S Digital-Display?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.