Inductive · 5 mm thin flat pack

Ultra-Thin Flat Inductive Proximity Sensors (5 – 10 mm thick)

A 5 mm thick slab with the sensing face on the flat: bolts to a gripper finger, a conveyor edge or the inside of a channel where no barrel fits.

Model LEF05 / LEF10 / LEH05 / LEH10 / LEC10 · Brand LE Raun · Category: Proximity Sensors

Thickness5 – 10 mm

Sensing5 – 10 mm

FaceFlat, front

ProtectionIP67

Request a quote Full specifications

Overview

A flat inductive sensor is a coil wound on a flat former inside a thin plastic slab. It gives up range — 5 or 10 mm from a 50 mm face, against 15 mm from an M30 — but it gives back a mounting surface: the whole back of the slab can be bolted flat, and the face can look sideways out of a 5 mm gap.Three shapes cover the usual cases. The LEF is 50.3 × 22 × 5 mm with the face on the flat side, flush-mountable. The LEH is 42 × 25 × 6 mm, non-flush, with a wider field. The LEC is 10 mm thick with an adjustable 2 – 10 mm range for when the gap varies.All are 10 – 30 V DC, 100 Hz, 1.5 ms response, IP67, with NPN or PNP output.

Application scenarios

Robot gripper finger

A 5 mm slab bolts to the finger and detects the part the moment it is gripped, with the cable running back along the finger.

Conveyor edge and transfer plate

Mounted flat in the side rail, it detects parts sliding past without standing in the product path.

Sheet presence on a vacuum table

The LEF10 with a 10 mm range sits under the table surface and detects the sheet through a 2 mm aluminium plate.

Pallet and tote presence in a magazine

The flat body slides between two magazine walls and sees the tote arriving.

Gate and flap position

A 5 mm sensor on the flap hinge reads the closed position where a barrel would foul the frame.

Industries

Robotics
Packaging
Electronics assembly
Material handling

Technical specifications

Series	LEF05 · LEF10 · LEH05 · LEH10 · LEC10
Dimensions	50.3 × 22 × 5 mm (LEF) · 42 × 25 × 6 mm (LEH) · 50 × 25 × 10 mm (LEC)
Sensing distance	5 mm or 10 mm fixed (LEF / LEH) · 2 – 10 mm adjustable (LEC)
Mounting	Flush (LEF, LEC) · non-flush (LEH)
Housing / face	PBT body and face
Operating voltage	10 – 30 V DC
Switching frequency	100 Hz
Response time	1.5 ms
Repeat accuracy	< 5 %
Ambient temperature	−25 °C – +70 °C
Output	NPN / PNP, NO / NC — NO / NC and PO / PC suffix
Protection	IP67
Current consumption	≤10 mA
Output current	≤200 mA
Voltage drop	≤1.5 V
Hysteresis	≤0.05 mm of the sensing distance
Circuit protection	Short-circuit, overload, reverse polarity
Cable	2 m PVC, 3 × 0.2 mm², oil-resistant

Dimensions

Item	Value
Mounting holes	2 × Ø3.2 mm, 42 mm apart
Sensing face	25 × 10 mm, on the 50 mm face
Cable	2 m PVC, 3-core

10 mm thick, so it slides behind a conveyor belt or under a transfer plate where no barrel would fit.

Wiring & output

Lead	Colour
2	Blue
3	Black
—	Two-wire types

How to specify

01
Choose shielded or unshielded
A shielded (flush) sensor can be embedded in metal with only its face exposed, at about 60 % of the unshielded range. An unshielded sensor needs a free zone around the barrel but reaches further.
02
Size the sensing distance
Order at least 1.5 × the nominal distance to allow for tolerances, temperature and target material. Non-ferrous targets — brass, aluminium, copper, stainless — reduce the distance to roughly 30–50 %.
03
Match the target size
The target should be at least as large as the sensing face. A smaller target reduces the distance proportionally, so a 4 mm target on an M18 sensor will not switch at 5 mm.
04
Pick the output and the body
NPN / PNP, NO / NC, 3-wire or 2-wire. Plastic barrel for general use, stainless for weld fields, PTFE-faced for weld spatter, high-temperature types up to 120 °C.

Why this series

5 mm thick, 50 mm long

The sensing face is the flat side, so the sensor can be bolted flat to a surface and still see sideways — no bracket and no stand-off.

Two mounting faces

The LEF has the face on one flat side; the LEH is non-flush with a wider field; the LEC is 10 mm thick with an adjustable 2 – 10 mm range.

5 or 10 mm fixed range

A flat 50 mm field is effectively a presence strip: anything crossing the face trips it, regardless of where it crosses.

Two bolts, no bracket

Through-holes at each end let it sit flat on a gripper finger or a channel wall without a right-angle bracket.

Questions

Can it see through a metal plate?

No — through a non-metal cover, yes; through metal, no. For a sheet on a metal table you need a cut-out or the LEC mounted above the surface.

How much range do I lose through a plastic cover?

About 10 – 20 % per millimetre of plastic. Tell us the cover material and thickness and we will confirm the gap.

Is 100 Hz enough for a fast gripper?

A gripper at 100 cycles/minute is fine. Above that, use the square LJQ family at 1 kHz.

Need a quotation for Ultra-Thin Flat?

Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.