Omron B5W-LB21, B5W-LB, B5W-LB2101, B5W-LB11, B5W-LB2112 User Manual
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Light convergent reflective type sensor
B5W-LB series
User manual
１ Outline
Output method Analog output
Figure
Miniature type
Sensing distance
（White paper)
１０
to ５５ mm
Supply voltage
５ VDC +/- 10%
Output configuration
Light ON Dark ON Light ON Dark ON
-
２４ VDC +/- 10%
２４ VDC +/- 10%
B5W-LB11series
B5W-LB21 series
Digital output
Digital output
Super miniature type
２ to １０ mm
１０ to
５５ mm
Miniature type
This user manual describes usage guidance and special matters regarding the light convergent reflective sensor;
B5W-LB series. This document makes supplementary statements to the data sheet and the product specification
sheet. Therefore, please read this manual in order to effectively use the sensors within your actual application.
The following table shows the product line of the B5W-LB series. The digital output models are easy to use sensors
that can operate with 24 volts and can be connected to a PLC. The analog output model can be directly connected
to an A/D input terminal of a microcomputer. It is good to use for applications which require threshold level
adjustment.
２ Construction
The B5W-LB series consists of an optical lens (with visible light cutting filter), an infrared LED, a light receiver, and an
analog circuit, as shown below.
Optical lens
Note: A variable resister is mounted in the analog output
model. Since it is for Omron’s internal use only, it
should not be touched. Otherwise the sensor will not meet
Photo receiver
Infrared LED
2.1 Analog output model
The internal circuit of B5W-LB2101 is shown in the upper-right figure.
- The LED device should be driven with a pulse signal from
an external circuit.
- The threshold level for the output voltage should be
properly set according to application details such as
sensing distance, objects sensed, and so on.
Regarding recommended pulse signal and
external disturbing light canceling processing method, please
refer to page 6. Usage guidance (Circuit).
2.2 Digital output model
The internal circuit of B5W-LB2112/2122/1112/1122 is shown
in the lower-right figure. The digital output model includes an
LED pulse-driven circuit and its threshold level is fixed.
The model has an NPN open collector output.
the product specification sheet.
1
B5W-LB Light convergent reflective type sensor User’s manual (E592)
３ Outline dimensions
The outline dimensions of the B5W-LB series are shown below. Please refer to the data sheet for more details.
(1) Super miniature type: B5W-LB11 series (2) Miniature type: B5W-LB21 series
Emitter/
Receiver lens
Emitter/
Receiver lens
Size: 26mm X 8.4mm X 13mm
Size: 40mm X 8.4mm X 15.9mm
For wiring, connector with cable: EE-5002 1M can be provided as an optional accessary.
* This wire harness assembly is available only for the digital output models (3-pin), not for the analog output
model.
４ Product features
Reflective optical sensors can generally be categorized into two types; light diffuse reflective and light convergent
reflective. The optical paths of both the emitter and the receiver in the light convergent type are narrower and more
angular than those of the light diffuse type. This optical convergent design can enhance its sensing ability for lowreflective objects because of its high density light beam. The sensing area of the convergent type is thereby limited
as shown by the figures below.
<Light diffuse reflective type> <Light convergent reflective type>
The B5W-LB series is composed of light convergent reflective type sensors utilizing
Omron’s original optical lenses which are combined with 4-toroidal lens designs. These
sensors can provide stable sensing with a small amount of reflected light, and even black
paper and transparent plates can be detected in its wide sensing range. Furthermore,
the B5W-LB series will not detect any highly reflective background that is positioned
beyond the sensor’s sensing area.
B5W-LB Light convergent reflective type sensor User’s manual (E592)
Toroidal lens
2
5 Usage guidance (Detection)
Analog and digital output models are lined up in the miniature type B5W-LB series. Both models have the
same optical characteristics. In order to provide a better understanding of B5W-LB series, the analog output
model will be explained first.
5.1 Analog output model
The table “Electrical and Optical Characteristics” mentioned in the data sheet of B5W-LB2101 is shown below.
The sensor can be used in any application which requires detection of a wide variety of objects. However, within the
table, only white and black papers are used to specify the sensing distance characteristics. (See explanation,
below).
The sensing capability of a sensor can be verified with the
graph “Receiver output vs. Sensing distance characteristics”.
The graph of B5W-LB2101 is shown below.
The sensing distance with black paper can be read as
follows;
-Sensing distance (Black paper):
The output voltage should be 70 mV or more in the distance
range of 10 to 40 mm.
The non-sensing distance with white paper is read
as follows;
-Non-sensing distance (White paper):
The output voltage should be 30 mV or less in the distance
range of 85 mm or more.
3
Reference value
Receiver output vs. Sensing distance
Reference value
Black
paper
White
paper
70mV
30mV
10mm
40mm
When designing your actual application, the sensing distance should be properly determined by first referencing
the graph of “Receiver output vs. Sensing distance.” In the case that the sensing object position does not
fluctuate, the sensing distance is recommended to be set at the peak of the graph’s curve.
As previously stated, commercially available white and black papers are used to specify the characteristics
values in the product specification sheet. However the sensed objects are typically not black or white papers in
actual applications. Therefore it is necessary to measure “Output voltage-sensing distance” with the actual
objects to be sensed. It is essential to set a proper threshold level according to the evaluation test data obtained
for the considerable worst case conditions, in order to achieve long term stable sensing in your applications.
Additionally, it is ideal to test as many samples as possible to consider individual differences of sensors. The
recommended minimum threshold is 40 mV, but this depends on the actual environmental noise situation.
B5W-LB Light convergent reflective type sensor User’s manual (E592)
85mm
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