LR18XBN12DPRY, LANBAO, inductive sensor, M18, Sn 12 mm, PNP, NO and NC, cable 2 m

LR18XBN12DPRY – Inductive proximity sensor in a cylindrical housing

LR18XBN12DPRY is an inductive proximity sensor in a cylindrical housing from LANBAO, size M18. It detects metal objects without contact using an electromagnetic field, with no mechanical wear and no need for physical contact.

Key features

• Sensing distance 12 mm – rated value for a standard steel target.
• PNP output, NO and NC contact (programmable) – connects to a PLC digital input or a relay coil.
• Supply 10–30 V DC.
• Non-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 LR18XBN12DPRY

Wiring of LR18XBN12DPRY 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).

Wiring of a four-wire cable with two outputs.

Mounting and free space

The sensor has a non-flush sensing face and must protrude from the metal. Metal in the axis of the face shortens the range or causes permanent switching, so the free space shown in the dimension drawing must be maintained.

Non-flush mounting: free space must remain around the face.

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 12 mm for this model. The tolerance is ±10 % and the distance also changes with temperature and supply voltage.

The same sensor with a different connection

• LR18XBN12DPRY-E2 – the same sensor with a connector M12/4 pins

The cable version is cheaper, but replacing the sensor requires pulling the entire cable. The connector variant can be replaced in a minute and is suitable where there is no time for downtime.

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

• Non-flush mounting: the face must remain free. Surrounding metal in the axis of the face shortens the range or causes permanent switching – keep the free space shown in the dimension drawing.
• PNP output (switches plus) matches the standard PLC digital inputs used in Europe. For NPN-type inputs, choose the corresponding variant with the same sensing distance.
• NO and NC contact: the output logic can be selected by wiring, so one model covers both the normally open and normally closed function.
• 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 12 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 PNPoutput. If you need NPN, 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 NO and NC (programmable).

Similar models in the same series

• LR18XBN12DNCY
• LR18XBN12DNCY-E2
• LR18XBN12DNOY
• LR18XBN12DNOY-E2
• LR18XBN12DNRY

Frequently asked questions

Does LR18XBN12DPRY have a PNP or NPN output?

LR18XBN12DPRY has a PNP output with NO and NC contacts (programmable). It therefore matches the standard PLC digital inputs used in Europe.

What is the sensing distance of LR18XBN12DPRY?

The sensing distance (Sn) is 12 mm. This is the rated value for a standard steel target; the range is shorter for non-ferrous metals.

How is LR18XBN12DPRY connected?

LR18XBN12DPRY 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 LR18XBN12DPRY wired by wire colours?

Brown wire to supply plus, blue to minus, black is the NO output and white the NC output. 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.