Application Example (1-01)
Analysis Equipment A

Application Example (1-01)

Analysis Equipment A

Sense presence of various test-tubes


  • ・Detect the presence of various types of test-tubes set in a predetermined position.

Issues & Requests

  • ・Want to stably detect transparent or various-colored test-tubes (including the cap).
  • ・Want to adopt a sensor capable of detecting the test-tube newly added by the instrument user.
  • ・Want to downsize the instrument by using a sensor detecting no background objects.

Test-tubes are classified into various types by color and material, such as transparent, translucent, and colored in orange and brown. General sensors may not detect various test-tubes stably because the range of the sensible distance is narrowed down due to the color or surface state of the test-tubes.
In addition, if raising the sensor’s sensitivity to increase the range of the sensible distance, background objects are sensed, so downsizing of the instrument may become difficult.


  • ・Adopted model:
    Light convergent reflective sensor B5W-LB2112-1
  • ・The sensor has an optical design that incorporates specular reflection to detect various objects, such as glossy surfaces, black, and transparent. It is capable of stable detection regardless of test-tube variations.
  • ・Since the sensing range is broad to various objects (refer to the figures below), this sensor allows variations in test-tube positions to some extent.
  • ・This sensor contributes to the downsizing of the instrument because there is no influence from background objects in the predetermined non-sensing range.

For details, refer to B5W-LB Series: Light Convergent Reflective Sensor User’s Manual.

  • Distance Characteristics for
    Various Reflective Objects
  • Receiver Output-Sensing Distance Characteristics

*The possibility of detecting the object varies depending on the sensing object or how to install the sensor.
Be sure to conduct sufficient evaluation using the actual devices before staring practical use.

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