LR12XBF04DNCY, LANBAO, inductive sensor, M12, Sn 4 mm, NPN, NC, cable 2 m

LR12XBF04DNCY – Inductive proximity sensor in a cylindrical housing

LANBAO LR12XBF04DNCY inductive proximity sensor in a cylindrical housing, size M12 for reliable detection in machines and production lines. It detects metal objects without contact using an electromagnetic field, with no mechanical wear and no need for physical contact.

Key features

• Sensing distance 4 mm – rated value for a standard steel target.
• NPN output, NC contact – normally closed – connects to a PLC digital input or a relay coil.
• Supply 10–30 V DC.
• Flush mounting.
• Connection: cable 2 m.
• Degree of protection IP67 – protection against dust and temporary immersion.

How an inductive sensor works

The coil in the sensing face generates a high-frequency magnetic field. When a metal object enters the field, it induces eddy currentsin its surface, which draw energy from the field and dampen it. As soon as the damping exceeds the set threshold, the evaluation circuit switches the output. All this happens without any contact, so the sensor has no mechanically wearing parts.

High-frequency oscillation principle: coil field, eddy currents in the metal target and their damping effect.

Correction factor – why the range on aluminium differs from steel

The rated sensing distance applies to a standard steel target. For other metals it is reduced by a correction factor. Calculate the actual distance as the rated Sn multiplied by the material factor.

Standard target and tolerance

According to the manufacturer's catalogue, the standard target is a square plate of St37 steel, 1 mm thick. The side length equals the larger of: the diameter of the sensing face, or three times the sensing distance. A smaller target means a shorter range. The sensing distance tolerance is ±10 %, so never set the working point exactly at the Sn limit.

Technical specifications LR12XBF04DNCY

Wiring of LR12XBF04DNCY by wire colours

The colour coding complies with IEC 60947-5-2. Always compare the actual pin and wire assignment with the diagram in the sensor datasheet (Downloads tab).

Three-wire cable wiring according to IEC 60947-5-2.

Mounting and free space

The sensor has a flush sensing face, so it can be screwed into a metal structure right up to the face without affecting its function. The trade-off is a shorter sensing distance compared to the non-flush version.

Flush mounting: the face may be level with the metal.

Mutual interference of sensors

Two sensors mounted close to each other may interfere with each other. If you need to sense at two adjacent points, keep the lateral spacing given in the sensor's dimension drawing, or offset the sensors so that their faces do not point into the same space.

Set the working distance to 70 to 80 % of the rated Sn, i.e. safely below 4 mm for this model. The tolerance is ±10 % and the distance also changes with temperature and supply voltage.

Typical applications

• position and end-position detection of pistons, cylinders and slides
• counting metal parts on a production line
• monitoring the presence of a workpiece in a fixture or clamp
• sensing gears and camshafts for speed measurement
• replacing mechanical limit switches in dusty and wet environments

How to choose and what to watch out for

• Flush mounting: the sensor can be screwed into a metal structure right up to the face without affecting its function. Compared to the non-flush variant, however, it has a shorter sensing distance.
• NPN output (switches minus) is used mainly in Asian equipment and selected PLCs. For standard European inputs, the PNP variant is usually more suitable.
• NC contact (normally closed): the output is active at rest and opens on detection. It is used where a broken wire should cause the same reaction as a detection (safer logic).
• Cable outlet: the cheaper variant, but replacing the sensor requires pulling the entire cable. If you need quick replacement, choose a model with a connector (suffix -E1 for M8, -E2 for M12).
• Degree of protection IP67: protection against dust and temporary immersion. Not designed for permanent immersion or high-pressure washing – this requires IP69K.
• Sensing distance 4 mm is the rated value for a standard steel target. For stainless steel, brass, aluminium or copper it is reduced by a reduction factor – if you detect non-ferrous metals, allow a margin or choose a model with correction factor 1.

PNP or NPN – and what happens if you mix them up

PNP switches the positive pole, so it sends plus to the PLC input. It is the European standard and matches standard digital inputs. NPN switches minus and is used mainly in Asian equipment. If mixed up, the sensor either does not switch at all or reports a permanently active state — it usually will not be damaged, but it will not work.

This model has a NPN. If you need PNP, a variant with the same sensing distance is available — contact us and we will recommend the code.

NO or NC – and why it is not just a matter of convenience

NO (normally open) is an output that is active on detection. NC (normally closed) is active at rest and opens on detection. The difference is a safety one: with NC, a broken wire causes the same reaction as a detection, so the fault shows up immediately. With NO, a broken cable remains unnoticed until someone tries to switch.

This model has the contact NC – normally closed.

Similar models in the same series

• LR12XAN04DNO-E2
• LR12XBF04DNOY
• LR12XBF04DNOY-E2
• LR12XBF04DNRY
• LR12XBF04DNRY-E2

Frequently asked questions

Does LR12XBF04DNCY have a PNP or NPN output?

LR12XBF04DNCY has an NPN output with an NC contact – normally closed. Check that your PLC input matches this output type.

What is the sensing distance of LR12XBF04DNCY?

The sensing distance (Sn) is 4 mm. This is the rated value for a standard steel target; the range is shorter for non-ferrous metals.

How is LR12XBF04DNCY connected?

LR12XBF04DNCY is supplied with the connection: cable 2 m. The cable is part of the sensor; the other end is free for connection to a terminal block.

How is LR12XBF04DNCY wired by wire colours?

Brown wire to supply plus, blue to minus, and black is the signal output going to the PLC input or relay coil. The coding complies with IEC 60947-5-2.

Does this sensor also detect non-metallic materials?

No. An inductive sensor responds only to metal objects. For plastics, glass, wood, liquids or bulk materials, use a capacitive sensor.

A detailed datasheet with a dimension drawing and wiring diagram can be found in the tab Downloads.