LE40XZSN20DPC-E2, LANBAO, rectangular inductive sensor, 40x40x129mm, Sn 20 mm, PNP, NC, connector M12/4 pins

LE40XZSN20DPC-E2 – Inductive proximity sensor in a rectangular housing

LE40XZSN20DPC-E2 from LANBAO is an inductive proximity sensor in a rectangular housing, dimensions 40x40x129mm designed for continuous industrial operation. 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 20 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.
• Non-flush mounting.
• Connection: connector M12.
• 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 LE40XZSN20DPC-E2

Wiring of LE40XZSN20DPC-E2 by wire colours

Watch the cable choice: according to the manufacturer's catalogue, in the NC version with the M12 connector the output is on pin 2, i.e. the white wire. A three-pin cable M12 uses pins 1, 3 and 4 and pin 2 is missing, so for this sensor use a four-pin cable. The switched signal is then on the white wire, not the black one.

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

Connection cable for LE40XZSN20DPC-E2

The sensor has a connector M12, 4 pins, male (external thread with pins), so it requires a cable with a femaleconnector. The cable is not included.

• QE12-N4G5-N – M12, 4 pins, female, angled 90°, 5 m, PVC, with LED indication

In this NC version the output is on pin 2, which a three-pin cable does not contain, so choose a four-pin cable.

PUR version: we do not yet stock a M12 female cable with a PUR jacket (for oils, coolant emulsions, abrasion, low temperatures and drag-chain installation). Contact us and we will source it. A cable with a PVC jacket is intended for normal dry machine environments.

The LED indication of the switched output in the connector is designed for the PNP NO version. With other output combinations the cable works electrically, but the indicator may not show switching – in that case choose a cable without indication.

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

• 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.
• 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 M12: 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 20 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

• LE40XZSN20DNC-E2
• LE40XZSN20DNO-E2
• LE40XZSN20DNR-E2
• LE40XZSN20DPO-E2
• LE40XZSN20DPR-E2

Frequently asked questions

Does LE40XZSN20DPC-E2 have a PNP or NPN output?

LE40XZSN20DPC-E2 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 LE40XZSN20DPC-E2?

The sensing distance (Sn) is 20 mm. This is the rated value for a standard steel target; the range is shorter for non-ferrous metals.

How is LE40XZSN20DPC-E2 connected?

LE40XZSN20DPC-E2 is supplied with the connection: connector M12. A connection cable with a matching connector must be ordered separately.

How many pins should the cable for LE40XZSN20DPC-E2 have?

According to the manufacturer's catalogue, in the NC version with the M12 connector the output is on pin 2, which a three-pin cable does not contain. Therefore use a four-pin cable – the switched signal is on the white wire.

Which cable do I need for LE40XZSN20DPC-E2?

Cable with a female M12 connector. We stock QE12-N4G5-N (4 pins, 5 m, PVC); for sensors with one output, three-pin QE12-N3G5-P or QE12-N3G5-N. can also be used. The cable is not included.

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