Thickness measurement in hot rolling mills

Thickness measurement is one of the most important measurement tasks in hot rolling mills. With the O-frame and C-frame thicknessCONTROL MTS 820x and MTS 920x series, Micro-Epsilon offers high precision measurement systems. Based on laser triangulation technology that uses a discrete laser line, these systems offer numerous advantages over alternative measurement technologies.

Special features:

  • Material-independent measurements
  • Alloy-dependent calibration is not necessary
  • Robust for harsh environmental conditions due to protection against emulsion, steam and high temperatures
  • Large sensor distance with high precision
  • High lateral resolution enables precise edge detection
  • Flexible software and hardware enable easy integration to the rolling mill



System type:

O-frame thicknessCONTROL MTS 9201.LLT

Installation situation:

The system is an O-frame shaped design with a welded construction that is integrated into the line after the scissors operation. Sensors and electronics are water-cooled in order to resist high temperatures. The upper sensor is adjusted to the thickness using a vertical axis in order to measure the large thickness variation with correspondingly high precision.

Thickness measurement systems as a O-frame with laser line sensors

thicknessCONTROL MTS 9201.LLT is specifically designed for harshest environments such as aluminum hot rolling mill applications. These systems stand out due to their solid steel frame. The optical sensors are water-cooled in order to ensure a longer service life. The integrated, electronic components remain in the specified temperature range, as the frame is purged with cold air. Another special feature is the patented, fully automatic monitoring of the linearity in the ‘parked’ position using a certified calibration standard. In this way, not only are thermal effects on the mechanics of the measuring frame monitored but also the factors affecting the sensor electronics, which are corrected automatically using a patented linearization process.

 Special features:

  • Optionally expandable with vertical linear axis for measuring range extension
  • Measuring rate up to 2kHz


System type:

C-frame thicknessCONTROL MTS 8202.LLT

Installation situation:

The system is designed as a suspended C-frame behind the stand. The upper sensor is moved using a vertical axis. This enables a small and therefore high precision sensor measuring range to be used despite a large change in thickness.

Thickness measurement system as a C-frame with laser line sensors

The MTS 8202.LLT is equipped with laser triangulation scanners which means measurements are independent of the surface properties of the target material. Scaling or mirror effects of the metal surface are therefore absorbed. Furthermore, compared to point sensors, the system offers higher accuracy and a larger mouth width. Automatic inline calibration ensures that measurements are unaffected by temperature changes. The measurement line is arranged vertically to the material flow, enabling the system to cope with lateral strip tilting.

Special features:

  •     Linearity of ±5 µm with measuring range of 40mm
  •     Mouth width 300mm
  •     Immersion depth 50mm to 800mm
  •     Special sizes on request
  •     Measuring rate up to 2kHz

8120 Brownleigh Dr.
Raleigh, NC 27617
919 787 9707
919 787 9706