LE81VF15DPC-E1, LANBAO, rectangular inductive sensor, 8x8x59mm, Sn 1.5 mm, PNP, NC, connector M8/3 pins

LE81VF15DPC-E1 – Inductive proximity sensor in a rectangular housing

LE81VF15DPC-E1 (LANBAO) is an inductive proximity sensor in a rectangular housing, dimensions 8x8x59mm. It detects metal objects without contact using an electromagnetic field; the rectangular housing is screwed onto a flat surface, so it needs no threaded hole or nuts.

Key features

• Sensing distance 1.5 mm – rated value for a standard steel target.
• PNP output, NC contact – normally closed – connects to a PLC digital input or a relay coil.
• Supply 10–30 V DC.
• Flush mounting.
• Connection: connector M8/3 pins.
• 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 LE81VF15DPC-E1

Wiring of LE81VF15DPC-E1 by wire colours

The sensor uses pins 1, 3 and 4 of the M8, connector, so a three-pin cable M8 is sufficient; a four-pin cable can also be used.

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).

Connector pin assignment according to the manufacturer's catalogue.

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

Connection cable for LE81VF15DPC-E1

The sensor has a connector M8, 3 pins, male, so it requires a cable with a femaleconnector. The cable is not included.

• QE8-N4F10 – M8, 4 pins, female, straight, 10 m, PVC, without indication
• QE8-N4G10 – M8, 4 pins, female, angled 90°, 10 m, PVC, without indication

A four-pin cable M8 can be used on a three-pin sensor without restriction – the fourth wire remains unconnected. It does not work the other way round: a three-pin cable would not carry the second output of a four-wire sensor.

PUR version: we do not yet stock a M8 female cable with a PUR jacket. Contact us and we will source it. A cable with a PVC jacket is intended for normal dry machine environments.

The same sensor with a different connection

• LE81VF15DPC – the same sensor with a fixed cable 2 m

Typical applications

• mounting on a flat frame or profile without drilling a threaded hole
• position detection in narrow and confined machine spaces
• monitoring stops and end positions of handling devices
• checking the presence of a metal part in a tray or magazine
• applications where sensing from the side rather than along the axis is needed

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.
• 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.
• 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).
• Connector connection M8/3 pins: a separate connection cable with a matching connector is required for operation – you will find it in the Cables with connector category.
• Degree of protection IP67: protection against dust and temporary immersion. Not designed for permanent immersion or high-pressure washing – this requires IP69K.
• Sensing distance 1.5 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 NC – normally closed.

Similar models in the same series

• LE81VF15DNC-E1
• LE81VF15DNO-E1
• LE81VF15DPO-E1
• LE82VF15DNC-E1
• LE82VF15DNO-E1

Frequently asked questions

Does LE81VF15DPC-E1 have a PNP or NPN output?

LE81VF15DPC-E1 has a PNP output with an NC contact – normally closed. It therefore matches the standard PLC digital inputs used in Europe.

What is the sensing distance of LE81VF15DPC-E1?

The sensing distance (Sn) is 1.5 mm. This is the rated value for a standard steel target; the range is shorter for non-ferrous metals.

How is LE81VF15DPC-E1 connected?

LE81VF15DPC-E1 is supplied with the connection: connector M8/3 pins. A connection cable with a matching connector must be ordered separately.

How many pins should the cable for LE81VF15DPC-E1 have?

The sensor uses pins 1, 3 and 4, so a three-pin cable is sufficient; a four-pin cable can also be used. The signal is on the black wire, plus on the brown and minus on the blue.

Which cable do I need for LE81VF15DPC-E1?

A cable with a female M8 connector – QE8-N4F10 (straight) or QE8-N4G10 (angled 90°), both 10 m with a PVC jacket. A four-pin cable can be used on a three-pin sensor without restriction.

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