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          7. Sensor Head, Small Spot, Laser Class 2

          CCD Laser Displacement SensorLK series

          Sensor Head, Small Spot, Laser Class 2


          [Discontinued model]

          This model has been discontinued.

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          Sensor head Long-distance *1 Sensor head

          Measurement mode

          High-precision mode,Long-range mode

          Reference distance

          350 mm (High-precision mode),500 mm (Long-range mode)

          Measuring range

          ±100 mm (High-precision mode),±250 mm (Long-range mode)

          Light source


          Visible red semiconductor laser


          690 nm


          0.95 mW

          Laser Class

          FDA (CDRH) 21CFR
          Part 1040.10

          Class 2 Laser Product


          IEC 60825-1

          Spot diameter (at standard distance)

          Approx. 0.7 mm (High-precision mode),Approx. 0.3 mm (Long-range mode)


          ±0.1% of F.S. *2


          10 µm*3 (High-precision mode), 50 µm*3 (Long-range mode)

          Analogue output

          Output voltage

          ±10 V (10 µm/mV)*4 (High-precision mode), ±5 V (50 µm/mV)*4 (Long-range mode)


          100 Ω

          Output current

          4 to 20 mA (Applicable load: 350 Ω max.)

          Alarm output

          NPN: 100 mA max. (40 V max.) (N.C.), Residual voltage: 1 V max.

          Sampling cycle

          1,024 µs

          Other functions

          Auto-zero, analog output holding when an alarm occurs, gain switching, response switching, span and shift adjustment of mirror surface measurement mode, changing the sampling cycle

          Temperature characteristics

          0.02% of F.S./°C


          Power voltage

          24 VDC ±10 %, Ripple (P-P) 10 % or less

          Maximum current consumption

          400 mA max.

          Environmental resistance

          Enclosure rating


          Ambient light

          Incandescent or fl uorescent lamp: 10,000 lux max.

          Ambient temperature

          0 to +50 °C (No condensation)

          Relative humidity

          35 to 85 % RH (No condensation)

          Vibration resistance

          10 to 55 Hz, Double amplitude 1.5 mm, 2 hours in each of the X, Y, and Z directions


          Aluminium die-cast


          Approx. 700 g (including cable)

          *1 The LK-503 can both be used in High-precision mode or Long-range mode.
          *2 Linearity was obtained using KEYENCE's standard target (Zirconia block gauge: LK-031/036, LK-081/086, LK-011, White ceramic block gauge: LK-501/503).
          *3 Repeatability was obtained using KEYENCE's analogue sensor controller (RD-50) with the number of averaging measurements set to 64.
          Note: The ripple of the analogue output may be 1 mV or more due to co mmon mode noise when observed with an oscilloscope or a high-speed A/D conversion board.
          *4 When measurement is impossible, 12 V (31.2 mA) is output.

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          Phone: +44 (0) 1908-696-900
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          Measurement Sensors