Product Details Portlet

B5W-LB series Light Convergent Reflective Sensor

Light Convergent Reflective Type for Reduced Color and Material Susceptibility Reliable Detection of Shiny, Black or Transparent objects

  • < Robustness of color >
    Stable detection of shiny, black or transparent objects
    Unaffected by backgrounds, meaning only the intended object is sensed accurately.
  • < Robustness of the distance >
    A wide sensing range to allow object shifting
  • Robust design resistant to ambient lights
  • Analog voltage output and digital output models are available
  • 55 mm and 10 mm sensing distances are available
RoHS Compliant
Note: This web page provides an excerpt from a datasheet. Refer to Product Datasheet and other applicable documents for more information.
  • [Reliable Detection of Shiny,Black or Transparent objects]Light Convergent Reflective sensor for embedding in 24 VDC equipment [Miniature type]B5W-LB2 Sensing distance: 10 to 55 mm
  • 3features[Robustness of color] Stable detection of shiny, black or transparent objects[Robustness of the distance]A wide sensing range to allow object shifting[Line up]Suitable for embedding in commercial equipment


  • [Container detection]Analysis equipment[Printed paper detection]Printing equipment[Tablet package detection]Tablet packagers
  • [Cup detection]Coffee makers[Article detection inside boxes]Delivery boxes[Hand detection]Sanitation equipment
[Robustness of color]Stable detection for of shiny, black or transparent objects [Past problem]Sensing of shiny, black or transparent objects was unstable, requiring more man-hours for development and production processes.→[Solution!]With OMRON's Light Convergent Reflective Sensors, unstable sensing of shiny, black or transparent objects is no longer a problem, meaning less man-hours! Contributing to reduction of man-hours. [Here's why]Light Convergent Reflective Sensor Principles The presence of an object is detected by the received light reflected off a sensed object. The sensor's optical system has a limited projection beam and light sensing area, so the system is capable of sensing objects only within a specific distance from the sensor (the range in which the projection beam and the light sensing area overlap).

Unaffected by backgrounds, meaning only the intended object is sensed accurately.[Past problem](1) At a sensing distance for white objects, a black object is not sensed.(2) At a sensing distance for black objects, a white background is sensed.→[Solution!]Objects can be sensed accurately, regardless of object color.
[Robustness of the distance]A wide sensing range to allow object shifting [Past problem]Sensing was not possible due to object shifting.→[Answer!]A wider sensing range has been realized through the use of four types of toroidal lenses.Sensing is even possible in the case of object shifting.[Here's why]Optical simulations were used in the design of these lenses to provide robustness in terms of both color and distance. Lens design using optical simulation. [Past]The low levels of light reflected off shiny, black or transparent objects made detection unstable.→[Answer!]OMRON's unique structure uses four types of toroidal lenses to enable stable sensing, even at minimal light levels.
[Line up]Suitable for embedding in commercial equipment Output type Analog output type Digital output type Exterior Miniature type Super miniature type Power supply voltage 5 VDC ±10% 24 VDC ±10% Output type Analog (phototransistor output) ON/OFF (NPN open collector output) Degree of protection - IP50 Sensing distance(Target object: white paper) 10 to 55 mm Note: When using a predetermined threshold value 2 to 10 mm Model B5W-LB2101-1 B5W-LB2112-1 B5W-LB2122-1 B5W-LB1112-1 B5W-LB1122-1[24 VDC]Noise-resistant, 24 V types ideal for use in commercial equipment are also available in our lineup.[Connects easily]An ON/OFF output that enables direct connections to control equipment such as PLCs.[Environmental resistance]IP50 for use in a wide range of applications, including heavy dust. Note: Only digital output type[Performance comparison with conventional sensors]Capable of sensing workpieces of various colors over a wide sensing range
Sensing method Appearance Size Connecting method Output type Sensing distance Operating mode Model Minimum number of deliverable units
(Unit: pieces)
B5W-LB1112-1/B5W-LB1122-1 Super miniature Connector NPN open
2 to 10 mm* Light-ON B5W-LB1112-1 1
Dark-ON B5W-LB1122-1
B5W-LB1112-1/B5W-LB2122-1 Miniature 10 to 55 mm* Light-ON B5W-LB2112-1
Dark-ON B5W-LB2122-1
B5W-LB2101-1 Analog voltage output --- B5W-LB2101-1
* White paper
Item Sensing method Light Convergent Reflective
NPN output B5W-LB1112-1 B5W-LB1122-1 B5W-LB2112-1 B5W-LB2122-1
Sensing distance White paper 2 to 10 mm 10 to 55 mm
Black paper 3 to 8 mm 10 to 40 mm
Non-sensing distance (White paper) 20 mm min. 85 mm min.
Minimum detectable object (refernce value) 0.05 mm dia. 0.15 mm dia.
Differential travel 20% max.
Light source (wavelength) Infrared LED (850 nm)
Power supply voltage 24 VDC ±10%, including 10% ripple (p-p)
Current consumption 15 mA max. (at 26.4 VDC) 20mA max. (at 26.4 VDC)
Operating mode Light-ON Dark-ON Light-ON Dark-ON
Control output Load power supply voltage: 26.4 VDC, load current: 50 mA max.
Residual voltage; 0.8 V max. at 50 mA load current and 0.32 V at 10 mA load current,
Open collector output (NPN)
Indicator Not supported
Response time Operate/reset: 1 ms max.
Ambient illumination Incandescent lamp: 3,000 lx max., Sunlight: 10,000 lx max.
Ambient temperature range Operating: -10 to +60°C, Storage: -25 to +80°C (with no icing or condensation)
Vibration resistance 10 to 55 Hz, 1.5-mm double amplitude for 2 h each in X, Y, and Z directions
Shock resistance 500 m/s2 for 3 times each in X, Y, and Z directions
Degree of protection IEC IP50 (not including terminals)
Connecting method Connector models
Weight (unit only) Approx 1.6 g Approx 3.4 g
Material Case Polycarbonate (PC)
Lens Acrylic (PMMA)
Cover Polycarbonate (PC)


Terminal No. Name
2 Vout
3 Vcc


Terminal No. Name
2 Vout
3 Vcc


Terminal No. Name
1 Pulse
3 Vout
4 Vcc

Precautions for Correct Use

● Mounting

  • (1)Ambient light may cause the sensor to malfunction.In such case, mount the sensor at an angle that ambient light does not enter the receiver lens. Make sure that the sensor does not affected by ambient light.
  • (2)Mount the sensor securely on a flat surface.
  • (3)Use M3 screws to secure the sensor (use together with spring washers and 6-mm-diameter flat washers to prevent screws from loosening). Use a tightening torque of 0.54 N·m max.
  • (4)Take care that nothing comes into contact with the detected part of the sensor. Damage to the sensing element will result in poor performance.
  • (5)Before using the sensor, check to make sure that it has not become loose due to vibration or shock.
  • (6)Analog output models have a potentiometer mounted on the PCB. This potentiometer is used for in-house processes by OMRON and should not be touched.

● Wiring


Surge Prevention

  • (1)If there is a surge in the power supply, try connecting a Zener diode or a capacitor (with a capacitance of 0.1 to 1 μF), depending on the operating environment. Use the sensor only after confirming that the surge has been removed. We recommend use of 30 to 35 V Zener diodes for a 24 VDC power supply and 10 to 15 V Zener diodes for a 5 VDC power supply.
  • (2)Do not use a small inductive load, such as a relay.
  • (3)Separate the wiring for Light convergent reflective sensors from high-voltage lines or power lines. If the wiring is routed in the same conduit or duct as such lines, the Light conver- gent reflective sensors may malfunction or may be damaged by inductive interference.
  • (4)For the digital type, make sure that the connectors are securely locked.

● Handling during Wiring

  • (1)If a force is applied to the connection area between the ter- minal and connector by bending or pulling the cable after the wiring is completed, the connector contact part or connec- tion area with the cable may be damaged, resulting in con- tact failure. Make sure that a stress (external force) as shown in the figure below is not applied to the connection area between the terminal and connector when routing and connecting cables or harnesses.
  • (2)Do not perform cord wiring when power supply voltage is applied. Doing so may result in breakage.

● Design


Light Convergent Reflective Sensor
A modulated-light type of light convergent reflective sensor is used. When designing, give proper consideration to the power supply and cable lengths used. Light convergent reflective sensors are more easily affected than the sensors with Nonmodulated Light.

Reasons for Interference from Power and Cable Length on the sensors with Modulated Light
An LED emitter is pulse-lighted to produce modulated light. A large current momentarily flows to the sensors in sync with this pulse timing. This causes a pulsating consumption current. A photoelectric sensor incorporates a capacitor with sufficient capacity, and is virtually unaffected by the pulse of the consump- tion current. With a small sensor, however, it is difficult to have a capacitor with a sufficient capacity. Accordingly, when the cable length is long or depending on the type of power source, it may become impossible to keep up with the pulse of the consumption current and operation may become unstable.


Adding a Capacitor

・Attach a capacitor of 10 μF min. to the wires as close as possi- ble to the Sensor. (Use a capacitor with a dielectric strength that is at least twice the Sensor's power supply voltage. Do not use tantalum capacitors. A short-circuit may cause the capaci- tor to ignite due to the large current flow.)


< Cable Length >

・Design the configuration so that the maximum total cable length for the Photomicrosensor with Modulated Light is 2 m.

・When using a cable longer than 2 m, attach a capacitor (e.g., an aluminum electrolytic capacitor) with a capacity of 10 μF min. to the wires. The distance between the terminal and the capacitor must be within 2 m. Make sure that the total cable length is no longer than 5 m. To use a cable length longer than 5 m, use a PLC or other means to read the sensor output and then transmit the signals using a PLC's communications.

・Although cables are capable of being extended longer than 5 m, performance is likely to be affected by noise interference from adjacent cables and other devices. Voltage drops due to the resistance of the cable material itself will also influence performance. Therefore, factors, such as the difference in voltage between the end of the cable and the sensor and noise levels, must be given full consideration.


Countermeasures for Switching Power Supplies
・Take either of the following countermeasures as required if connecting a sensor to a switching power supply.

  • 1. Attach a capacitor of 10 μF min. to the wires as close as possible to the sensor. (Use a capacitor with a dielectric strength that is at least twice the sensor's power supply voltage. Do not use tantalum capacitors. A short-circuit may cause the capacitor to ignite due to the large current flow. Do not use tantalum capacitors. A short-circuit may cause the capacitor to ignite due to the large current flow.)
  • 2. Connect to the 0-V line of the power source or connect to the power source via a capacitor of approximately 0.47 μF to reduce the impedance of the mounting base to prevent inductive noise from entering the mounting base. Or, con- nect by way of a capacitor (approx. 0.47 μF).
  • 3. Connect the noise filter terminal (neutral terminal to ACG) of the switching power supply to the case (FG) and 0-V ter- minal of the power supply. The line connected as mentioned above should be grounded or connected to the mounting base to ensure sta- ble operation. (Recommended by power supply manufacturers.)

Countermeasures to Handle Inductive Noise

  • 4. Insert a plastic insulator of approximately 10 mm between the Sensor and the mounting base.

Effects of Inductive Noise

・When there is inductive noise in the Sensor mounting frame (metal), the output of the sensor may be affected. In this case, ensure that there is no electrical potential difference between the sensor 0-V terminal and the sensor mounting frame, or put a 0.47-μF capacitor between the 0-V terminal and the frame.


< Effects when the power supply is turned ON >
(Digital only)

An output pulse may occur when the power supply is turned ON depending on the power supply and other conditions. Use the sensor in the stable ready-for-detection state reached in 100 ms after turning on the power supply.