Inductive · 2 – 40 mm, long range

Long-Range Inductive Proximity Sensors (2 – 40 mm)

Two to four times the sensing distance of a standard body in the same diameter: 40 mm from an M30, 20 mm from an M18, 10 mm from an M12.

Model LJ6.5M-C / LJ6.5C-C / LJ8M-C / LJ8C-C / LJ12M-C / LJ12C-C / LJ18M-C / LJ18C-C / LJ30M-C / LJ30C-C · Brand LE Raun · Category: Proximity Sensors

Bodyφ6.5 – M30

Sensing2 – 40 mm

MountingFlush or non-flush

ProtectionIP67

Request a quote Full specifications

Overview

The C-series long-range bodies use a larger coil and a higher-gain circuit to reach two to four times the distance of a standard sensor in the same housing. Two things follow: the field is wider, so brackets and adjacent metal matter more, and the switching frequency is lower — 100 Hz at 40 mm against 2 kHz at 2 mm.Both flush (M) and non-flush (C) versions exist at every diameter. Non-flush always reaches further — 40 mm on M30 against 22 mm flush — at the cost of a clearance ring around the face.The J bodies are the same sensors in a longer barrel: M12 to 68 / 72 mm, M18 to 80 / 83 mm, M30 to 80 / 82 mm. Use them where the mounting plate is thick and the face has to reach the far side.

Application scenarios

Vehicle and axle detection at a weighbridge

M30 bodies at 40 mm read a passing wheel from outside the wheel path, so nothing gets hit.

Steel strip edge and loop control

Long-range M18 sensors detect the strip without a dancer arm, clear of the oil mist and the strip whip.

Skip and bin level in a transfer chute

A 25 mm range on an M30 sees the load through a 10 mm stainless window in the chute wall.

Pressing and stamping die protection

The sensor sits behind the die shoe and still sees the stock, so it survives a misfeed that would destroy a short-range body.

Heavy-duty conveyor pulley sensing

M30 flush at 15 – 22 mm reads a bolt head on the pulley through a 12 mm gap and a layer of dust.

Industries

Steel and metal processing
Material handling
Automotive
Heavy machinery

Technical specifications

Series	LJ6.5M-C · LJ6.5C-C · LJ8M-C · LJ8C-C · LJ12M-C · LJ12C-C · LJ18M-C · LJ18C-C · LJ30M-C · LJ30C-C
Sensing distance	2 – 40 mm (M8: 2–6 · M12: 4–10 · M18: 8–20 · M30: 15–40)
Body sizes	φ6.5×45 · M8×45 · M12×45 / 50 · M18×55 / 60 · M30×55 / 60 mm
J versions	Longer barrel for deep mounting: M12×68 / 72 · M18×80 / 83 · M30×80 / 82 mm
Housing / face	Stainless steel (φ6.5), nickel-plated copper (M8 – M30), PBT face
Operating voltage	10 – 30 V DC
Switching frequency	2 kHz (short ranges) down to 100 Hz (40 mm)
Repeat accuracy	< 3.0 % (Sr), < 5.0 % (Sr) on the longest ranges
Output	NPN / PNP, NO / NC — N, N2, P, P2 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
Thread	M12 × 1 · M18 × 1
Cable	Ø4 mm on M12 · Ø5 mm on M18
Mounting	Two nuts on the thread; the non-flush versions need the 8 / 12 mm free zone shown on the drawing

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

Range where the bracket cannot reach

An M30 at 40 mm and an M18 at 20 mm let the sensor sit behind a guard, a wear plate or a conveyor frame instead of inside the product path.

Flush versions at long range

The M-suffix bodies are flush-mountable and still reach 22 mm on M30 — no clearance ring needed in a tight fixture.

J bodies for deep pockets

The J versions extend the barrel to 82 mm so the sensing face reaches the bottom of a bore while the cable stays outside the housing.

Wide field, so mind the bracket

A 40 mm field will also see the fixture. Mount with the target centred and keep other metal one face diameter away from the sides.

Questions

Why is a 40 mm sensor only 100 Hz?

Longer range means a bigger coil and a slower oscillator. If the target moves faster than 100 Hz, use a shorter range and a smaller gap instead.

Can two long-range sensors face each other?

Yes, but keep at least one face diameter between them, or alternate the mounting so their fields do not overlap. Mutual interference shows up as a chattering output.

Does the 40 mm version see through a stainless window?

A 1 mm stainless window costs roughly 30 – 40 % of the range. Confirm the window thickness with us before you design the pocket.

Need a quotation for Long-Range Inductive?

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