Precise thickness measurement device for films and sheets

Kapa features a dual sensor system for non-contact measuring of films and sheets up to 6 mm thick – with extreme accuracy.

Kapa is a non–nuclear technology that does not require licensing or protection guards.



Plastic films with precise thickness

Kapa controls thickness in films and sheets extrusion applications with narrow thickness tolerances –  for high quality production where every batch needs to be perfect.

Applications Include: Extruded Mono and Multilayer Plastic Film and Sheet, Thermoforming Sheet (PP, PE, PET, PS, ABS, PVC etc) , Land Fill Liners etc…


Two thickness ranges are available:

  • Kapa I – for sheets up to 3 mm thickness.
  • Kapa II – for sheets up to 6 mm thickness.

← 500 mm to 8 meter →

Kapa thickness gauges are available in widths of 500 mm to 8 meter

≤ 0,1 μm

Ultra-precise thickness measuring with an accuracy of ≤ 0,1 µm

≤ 3 mm / ≤ 6 mm

Kapa I and II series are suitable for material thickness of up to 3 mm / 6 mm respectively

Measuring Principle

Capacitive / Eddy current

Kapa uses a non-contact, indirect measuring method with a dual sensor configuration and a measuring roller. This extremely robust sensor combination in one housing features capacitive and eddy current sensors.

First, the capacitance between sensor and measuring roller is measured. This is automatically corrected by the distance measurement of the eddy current sensor. From this, the thickness is calculated in comparison with a calibrated value.

Technical Specifications

Kapa I
Kapa II

Measuring system

capacitive / eddy current

capacitive / eddy current

Max. thickness

3 mm

6 mm

Measured cleaving

4,5 mm

9,5 mm

Sensor diameter

30 mm

45 mm

Measuring spot diameter

12 mm

18 mm

Sensor resolution

0,05 µm

0,05 µm


≤ 0,1 µm

≤ 0,1 µm

Measuring speed

10 – 300 mm/s  adjustable

10 – 300 mm/s  adjustable

Process speed

10 – 500 mm/s  adjustable

10 – 500 mm/s  adjustable




Reference roller diameter

200 mm

200 mm

Please download the PDF data sheet for detailed technical specifications! 

Kapa in Action

Contact our Experts

Our experts are always available for your inquiries and technical consultation. Please contact us anytime at our HQ or refer to local SBI Mechatronik  representatives in your country!

Andreas Huemer

Sales Director

Andreas will develop a fitting solution for your requirements based on our products and services. 


tel. +43 (0) 7242 60649 

Roman Geist

Head of Engineering

Roman is your expert for technical questions, application development and custom solutions.


tel. +43 (0) 2952 50701 

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