Our website uses cookies and similar tools to improve its performance and enhance your user experience.


To find out more about the cookies we use or how to change your settings, please see our Cookie Policy. You can revoke your permission at any time here.

LS-400 laser sensor

  • LS-400 laser sensor

Laser heads

The LS series uses a highly focused and concentrated laser beam and a coaxial optical lens system to enable it to detect extremely small objects a long distance away. Choose from ultracompact sensor heads as a reflective light barrier with a polarisation filter or as a reflective sensor with a light spot or light band.

The LS series is particularly suitable for monitoring or detecting extremely small objects on a conveyor belt, for monitoring the sizes of objects and for monitoring edge positions in industrial production.


  • Retroreflective: coaxial lenses with polarized filters
  • Reflective types: spot type and line type
  • Red light laser diode laser class 1 or 2
  • Laser focus and line adjustable
  • Ultracompact size


  • Mounting bracket
  • Lens LSMR1 for line reflection type


  LS-H91 LS-H21 LS-H22
Sensor type Retroreflective Diffuse reflective Diffuse reflective (line)
Laser class 2
Rated sensing distance 7m 100cm
Sensing range 0.1 - 7m 3 - 100cm
Beam spot/line Ø 1 - 1.5mm Ø 0.2 - 1mm 30 -200mm
Wavelength 655nm
Max. output of the laser diode 3mW
Housing material Plastic
Protection IP 40
Size (H x W x D) 31 x 11.2 x 25mm
Connection method Cable with connector
Ambient temperature -10°C - +55°C
Weight (approx.) 30g


A jog switch and mode key allow you to conveniently program all controller functions; programming is easy with a dual, two-colour, 4-digit LCD display and several LED displays. The LS series' M.G.S. function, which allows the receiving sensitivity's dynamic range to be adjusted to prevent oversaturation of the reflected light intensity (transparent objects in the case of reflective light barriers or shiny objects in the case of reflective sensors, for example).


  • Double 4-digit display for current and threshold values
  • Mode key and jog switch for simple adjustment
  • Response time max. 80µs
  • Four output modes
  • Timer
  • Cross talk prevention
  • External teach-in (cable type)
  • Key lock function
  • External switch off of laser beam
  • Side-by-side mounting with FX-300 series possible
  • Cable or connector types


  • Main and sub cables for side-by-side mounting (1 / 2 / 5 m)


NPN output LS-401 LS-401C2
PNP output LS-401P LS-401PC2
Display LCD
Timer 1 - 9999ms
Output transistor Max. 100mA, 30V DC
Response time 80µs, 150µs, 500µs and 4ms
Max. current consumption 40mA
Housing material Plastic
Size (H x W x D) 75 x 30 x 10mm
Connection method Connector Cable 2m
Operating voltage 12 - 24V DC (±10%)
Ambient temperature -10°C to +55°C
Weight (approx.) 15g 65g

Typical applications

Product Feature

Checking size of objects

Product Feature


Product Feature

Edge detection

Product downloads