LR18XBF05DLO-E2, LANBAO, inductive sensor 2-wire, M18, Sn 5 mm, 2-wire, NO, connector M12/4 pins

LR18XBF05DLO-E2 – Two-wire inductive proximity sensor

LANBAO LR18XBF05DLO-E2 two-wire inductive proximity sensor, size M18 for reliable detection in machines and production lines. It detects metal objects without contact and switches in series with the load, so it needs only two wires — supply and signal share the same pair.

Key features

• Sensing distance 5 mm – rated value for a standard steel target.
• Output 2-wire, NO contact – normally open – connects to a PLC digital input or a relay coil.
• Supply 10–30 V DC.
• Flush mounting.
• Connection: connector M12/4 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 LR18XBF05DLO-E2

Wiring of LR18XBF05DLO-E2 by wire colours

A two-wire sensor has no separate signal wire – the load (PLC input, relay coil) is connected in series with the sensor. Before use, compare the residual current and voltage drop of the sensor with the minimum values of the input you are connecting it to.

According to the manufacturer's catalogue, the M12 connector uses pins 1 and 4 (pin 1 to plus, pin 4 via the load to minus).

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).

Two-wire connection – the load is in series with the sensor.

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

Connection cable for LR18XBF05DLO-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
• QE12-N3G5-P – M12, 3 pins, female, angled 90°, 5 m, PVC, with LED indication PNP
• QE12-N3G5-N – M12, 3 pins, female, angled 90°, 5 m, PVC, with LED indication NPN

The sensor has one output, so a three-pin cable is sufficient. A four-pin cable can also be used – the fourth wire remains unconnected.

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.

The same sensor with a different connection

• LR18XBF05DLO – the same sensor with a fixed cable 2 m

Typical applications

• retrofitting existing installations where only a two-core cable is laid
• replacing a mechanical limit switch without re-pulling the cabling
• saving wires and terminals in the control cabinet on large machines
• series connection with a relay, contactor or PLC input
• simple signalling and monitoring circuits

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.
• Two-wire connection: the sensor is connected in series with the load. Before use, check the residual current and voltage drop against the minimum values of the input you are connecting the sensor to.
• NO contact (normally open): the output is activated when an object is detected. If you need the opposite logic, an NC variant is available.
• Connector connection M12/4 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 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.

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 – normally open.

Similar models in the same series

• LR18XBF05DLC
• LR18XBF05DLC-E2
• LR18XBF05DLO
• LR18XBF05DLO-5MPUR
• LR18XCF05ATC

Frequently asked questions

Does LR18XBF05DLO-E2 have a PNP or NPN output?

LR18XBF05DLO-E2 has a 2-wire output with an NO contact – normally open. Check that your PLC input matches this output type.

What is the sensing distance of LR18XBF05DLO-E2?

The sensing distance (Sn) is 5 mm. This is the rated value for a standard steel target; the range is shorter for non-ferrous metals.

How is LR18XBF05DLO-E2 connected?

LR18XBF05DLO-E2 is supplied with the connection: connector M12/4 pins. A connection cable with a matching connector must be ordered separately.

How is the two-wire sensor LR18XBF05DLO-E2 connected?

Brown wire to plus, blue to minus, and the load is connected in series with the sensor – the two-wire version has no separate signal wire.

Which cable do I need for LR18XBF05DLO-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.