Recent Searches
    Series ( results)
      Models ( results)
          1. Home
          2. Products
          3. Sensors
          4. Laser Sensors
          5. Multi-Purpose Digital Laser Sensor
          6. Head Lineup

          Multi-Purpose Digital Laser Sensor

          LV-N series

          LV-S31 Small Beam Spot Reflective

          Small size and highly flexible installation

          LV-S31: Unaffected by Targets' Color

          No readjustment needed for tooling change

          Since the LV-S31 detects based on target height or position, and not color, it will not have to be readjusted when the color of a target changes.

          LV-S31 Series Adjustable Distance Detecting Head Laser Sensor

          Light receiving element: Dual Photodiode

          Light receiving element: Dual Photodiode

          Dual Photodiode

          The dual photodiode (PD) receives the reflected beam spot from a target and focuses it onto the dual PD. By adjusting the trimmer, the reflected spot can be centered so that half of the spot is on the NEAR PD, and half is on the FAR PD for a 1:1 ratio. As the target moves closer to the head, the reflected beam spot shifts more toward the NEAR PD and the displayed value will decrease. As the target is moved away from the head, the spot shifts toward the FAR PD and the displayed value increases. By detecting based on distance and not brightness, the LV-S31 can be set to detect that a part is not only present, but that it is in the correct position, regardless of the surface color.

          Adjust setting to optimum conditions without relocating sensor - Adjustable Structure

          You can adjust light receiving element to optimum conditions by simply rotating the adjustment trimmer.

          Adjust setting to optimum conditions without relocating sensor - Adjustable Structure

          Adjust setting with a sensor head

          Adjust setting with a sensor head

          The sensor head is equipped with an output indicator and position indicator that indicates the distance with a target. This makes it easy to adjust the settings online if the amplifier is not easily accessible or visible.

          Distance - Hysteresis (Typical)

          Hysteresis when the light receiving element and the setting value are adjusted to 5000 at each distance.

          Distance - Hysteresis (Typical)

          Color canceling function

          Color canceling function

          Dual photodiode and original algorithm correct color influence of a target that is displaced from the center.

          Long-range gap detection

          Long-range gap detection

          The LV-S31 can detect a 0.04" (1 mm) gap at a distance of 7.87" (200 mm) and a 0.02" (0.5 mm) gap at a distance of 1.97" (50 mm). (Target: White paper, response speed: SPED4 at ambient temperature) *Maximum detecting distance varies according to target's reflectance



          Detecting loose caps

          Detecting loose caps


          Detecting presence/absence of contents

          Detecting presence/absence of contents








          Small side view

          Adjustable distance definite reflective

          FDA (CDRH) Part 1040.10

          Class 1 Laser Product

          IEC 60825-1

          Light source

          Visible red semiconductor laser, Wavelength: 655 nm



          600 mm 23.62"

          480 mm 18.89"

          50 to 200 mm 1.97" to 7.87"
          (Adjustment range)


          500 mm 19.69"

          400 mm 15.75"


          400 mm 15.75"

          320 mm 12.6"


          300 mm 11.81"

          240 mm 9.45"


          200 mm 7.87"

          160 mm 6.3"


          150 mm 5.91"

          120 mm 4.72"

          Environmental resistance

          Ambient temperature

          -10 to +50 °C 14 to 122 °F (No freezing)

          0 to +50 °C 32 to 122 °F (No freezing)



          Glass reinforced plastic



          Lens cover

          Norbornene plastic


          Transmitter lens: Norbornene plastic
          Receiver lens cover: Polyarylate


          Approx. 70 g

          Approx. 75 g


          • General Catalog Request
          • Trade Shows and Exhibitions
          • eNews Subscribe

          Back to top

          KEYENCE CORPORATION OF AMERICA 500 Park Boulevard, Suite 200, Itasca,
          IL 60143, U.S.A.
          Phone: 1-888-KEYENCE [1-888-539-3623]
          Career Opportunities: KEYENCE Career Site