Support Portal

Application /Product Knowledge

MLG-2 Pro – measuring position of metal sheets with “LBH”

Article No: KA-01670
Version: 2.0
Subject to change without notice
This article describes how to measure the height position of a very thin metal sheet with MLG-2 Pro and LBH.
Related Products
MLG-2

Table of Contents

Task
  • Measuring the height position of a very thin metal sheet
  • MLG in vertical position (standing)
  • The thickness of sheets is smaller than MLG-2s beam resolution
  • For saving costs only 50 mm beam pitch

Condition
  • Rough measurement resolution
  • Thickness of sheet > 0.9 mm
  • Width of sheet min. 150 mm & max. 1000 mm

Interface
  • Analog output

Suggestion
  • MLG-2Pro with 50 mm beam pitch
  • Crossbeam measuring mode = effective for thin objects in center position
  • Setting LBH = "Lost Beam Hold" for moving objects, when the sheet is moving up and down by passing single beams the last interrupted beam will be held until the next will be passed

FAQ
  • Which methods can be used for detecting very thin sheets, which are smaller than MDO?
    Method 1 = simply move the receiver (resp. transmitter) a little down, please consider the max displacement of 3.5° (picture 2)
    Method 2 = using Cross Beam Mode, only for wide sheets (picture 3)
    Method 3 = using LBH together with Cross Beam Mode, suitable for smaller sheets as well
  • What must be considered with crossbeam mode?
    The sheet must be always in center position, so that at least one beam is crossing the sheet.
    Otherwise LBH can be used.

  • What must be considered with diagonal mounting?
    The displacement is limited to 3.5° according to MLG's view angle.
    The sheet must be wide enough, so that at least one of the diagonal beams get blocked.

  • What must we take care in case of using LBH?
    Once LBH has been set, the MLG never has the status “all beams made” again after the first beam has been interrupted.
    This means that there is no longer any useful presence detection.
Keywords:
measuring position of metal sheets, lbh, height position, vertical position, lost beam hold
Create request