CCD Laser Displacement SensorLK series


Sensor Head, Small Spot

[Discontinued model]

This model has been discontinued.

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Sensor head Compact high-accuracy Sensor head

Measurement mode

Normal,mirror surface

Reference distance

10 mm0.39" (Normal),7.0 mm0.28" (mirror surface)

Measuring range

±1 mm±0.04" (Normal),±0.9 mm±0.04" (mirror surface)

Light source


Red semiconductor laser


670nm (Visible light), Class 2 laser product (JIS C6802)


0.95 mW maximum

Spot diameter (at standard distance)

Approx. 20 µm


±0.25% of F.S.


0.1 µm *1 0.000004"

Analog output

Voltage output

±10 V (±9 V)
(0.1 µm 0.000004"/mV) *2


100 Ω

Current output

4 to 20 mA (350 Ω maximum)*3*4

Alarm output

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

Sampling cycle

128, 256, 512, 2,048 µs (selectable)

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

0.04% 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 32 to 122 °F (No condensation)

Relative humidity

35 to 85 % RH (No condensation)

Vibration resistance

10 to 55 Hz, Double amplitude 1.5 mm 0.06", 2 hours in each of the X, Y, and Z directions


Aluminum die-cast


Approx. 85 g (including cable)

*1 Repeatability was obtained using KEYENCE's analog sensor controller (RD-50) with the number of averaging measurements set to 64.
Note: The ripple of the analog output may be 1 mV or more due to common mode noise when observed with an oscilloscope or a high-speed A/D conversion board.
*2 When measurement is impossible, 12 V (31.2 mA) is output.
*3 LK-010: When measurements cannot be performed, this is 12 V (21 mA). LK-035/030, LK-085/080, and LK-500: When measurements cannot be performed, this is 12 V (31.2 mA).
*4 The ±5 V analog voltage output range (the ±

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