LR08BN02DLC, LANBAO, inductive sensor 2-wire, M8, Sn 2 mm, 2-wire, NC, cable 2 m

LR08BN02DLC – Two-wire inductive proximity sensor

LANBAO LR08BN02DLC two-wire inductive proximity sensor, size M8 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 2 mm – rated value for a standard steel target.
• Output 2-wire, NC contact – normally closed – 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 LR08BN02DLC

Wiring of LR08BN02DLC 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.

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 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 2 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

• LR08BN02DLC-E1 – the same sensor with a connector M8/3 pins
• LR08BN02DLC-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

• 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

• 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.
• 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.
• 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 2 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 NC – normally closed.

Similar models in the same series

• LR08BN02DLC-E1
• LR08BN02DLC-E2
• LR08BN02DLO
• LR08BN02DLO-E1
• LR08BN02DLO-E2

Frequently asked questions

Does LR08BN02DLC have a PNP or NPN output?

LR08BN02DLC has a 2-wire output with an NC contact – normally closed. Check that your PLC input matches this output type.

What is the sensing distance of LR08BN02DLC?

The sensing distance (Sn) is 2 mm. This is the rated value for a standard steel target; the range is shorter for non-ferrous metals.

How is LR08BN02DLC connected?

LR08BN02DLC 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 the two-wire sensor LR08BN02DLC 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.

What is the difference compared to a three-wire PNP/NPN sensor?

A two-wire sensor is connected in series with the load and does not need a separate signal wire. It saves one core in the cable, but a residual current flows through it and it has a higher voltage drop, which must be taken into account with sensitive PLC inputs.

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