SLMS – Stacker Layer Measurement System

The SLMS is a non-contact laser based measurement system for transversal processes that measures the length and number of boards that are passing by the sensor into a stacker layer.


Basic Specification

Measuring range4.800 mm (15.7 feet)
Stand-off850 mm (33.5”)
Resolution 1 mm (0.04”)
Repeatability ± 1,5 mm 2σ (± 0.06” 2σ)

Operating Principle
The LMS6048 length measuring gauge is perfectly suited to measure board stacks. The gauge is mounted on the side of the conveyor and measures layers of boards as they move to the stacker layer. The system PC software will record all individual boards and the total board length of the stacker. A convenient statistical report is generated with printing options.

The boards can also be separated from each other with small irregular distances.
The length values are sent as UDP-messages to the superior control/registration system.


To measure complete layers of boards in front of a stacker

To measure board by board and transmit total numbers and length.

Measuring Principle
The LMS6048 length gauge uses the principle of 2D laser based optical triangulation. A laser line is projected on to the surface of the material being measured.

High accuracy

  • Measures with accuracy even on bended and twisted boards due to LIMAB patented 80 mm (3.1”) height vision technology irrespective of the line speed
  • Independent of vibrations
  • High accuracy on long and short boards
  • Measures accurately even on dark ends

Board control

  • Control of all boards specific length and the total length of all boards that is processed in the sawmill


  • Non-contact measurement for best results

Proven design

  • The robust LMS6048 and its precursors LMS6044 and LMS6045 has been installed in more than 700 installations

Simple integration

  • Easy to install in new and existing production lines
  • No moving parts, no mechanical wear, long durability


  • Easy operator interface on side of laser
SpecificationSLMS / LMS6048
Part No96432
Laser colourRed
Laser classLaser Class 3B according to EN 60825-1:2014 and 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated June 24, 2007.
Stand off (SO)850 mm (33.5”)
Measuring range (MR)4.800 mm (15.7 feet), e.g. board length of 2,0 – 6,8 m (6.6-22.3 feet)
Output resolution1 mm (0.04”)
Measurement frequency1.000 Hz
Exposure time0,2 – 100 ms, automatically adjusted
Height Vision Xmin/Xmax80/55mm (3.1/2.2”) (line length at near/far of measuring range)
Power supply18….36 VDC
Power consumption max.10 W
Weight25 kg (55 lbs), (35 kg including bracket)
Operating temperature0…+40°C (32…104°F)
Industrial protection classIP52
Weight25 kg (35 kg including bracket)
Dimensions950 x 235 x 162 mm (37.4 x 9.3 x 6.4”)