B5W-LB Light convergent reflective type sensor User’s manual (E592)
Light receiving
path
External
Disturbing
lights
Light emitting
path
Sensing
object
Transparent
cover
７
Mounting instruction
1. The B5W-LB series can be mounted in 2 potential ways (X,Y direction). Please refer to the data sheet for further
detail.
* Please use M3 screw, spring washer, and flat washer with tightening torque of 0.54 N-m.
2. The B5W-LB series contains a special circuit that reduces the influence of external light interference. However,
it is recommended that designers create proper equipment design in which any direct or indirect external
disturbing light does not hit the sensor. In the case that the sensing surface must be exposed to ambient light,
please mount the sensor as shown below. Since the B5W-LB series has a narrow path angle of light receiving, the
sensor should be mounted in a direction which prevents external light from entering the light receiver.
A transparent plate should
be closely attached.
*Thickness:
１ｍｍ
max.
Gap
A transparent cover
Thick plate
3. In the case of attaching a transparent cover on the sensor for water/dust prevention purpose, the plate must be
closely attached to the sensing surface of the device. Depending on the thickness of the cover plate, the
reflected light at the inside surface of the plate will reach the sensor receiver. Therefore, proper evaluation should
be performed, especially for the super compact type which has a short sensing distance and a fixed threshold
level.
For example: variation of clearance gap, sensor’s individual difference, and contamination of the cover, such as
by water drops, dust, or contamination.
4. In the case that a transparent cover is required to be located away from the sensor, try to check the possibility of
tilting the cover. This design can eliminate the reflected light from the cover to the sensor (see the figure below).
However, this way may make the sensor always turn on when the conditions of the cover surface is compromised,
due to scratches, water drops, dust or contamination. Sufficient evaluation for proper threshold level will be
required by checking the sensor output voltage with the analog output model.
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