Overview
The document provides technical specifications and details for the VTLG laser gauges used for measuring strip thickness in metal strips. The system is designed to be installed directly in the mill and offers precise, absolute measurements regardless of the alloy.

Functionality
The VTLG system uses a compact measuring head on both the upper and lower sides of a C-frame to transmit and receive measurement beams. The sensors measure the distance from the strip surface, and the system calculates the strip thickness from these distances.

Advantages

• Direct installation in the mill.
• Absolute measurement independent of alloy type.
• Precision up to one micrometer per millimeter of strip thickness.

Measurement Parameters
The VTLG 101/1 model offers a measurement range from 0.003 mm to 30 mm, with various air gaps and measurement depths. The system provides a measurement resolution of up to 0.05 µm and accuracy of ±0.1% of the nominal value.

Dimensions
The installation space width ranges from 100 mm to 200 mm, with height below the pass line varying from 120 mm to 465 mm.

Laser Parameters

• Laser class: 3B
• Power: 15 mW
• Wavelength: 405 nm
• Measurement spot diameter: 0.1 mm
• Life time (MTBF): 80,000 hours

Control and Connection
The control unit dimensions are 760 mm x 1,000 mm x 300 mm, with a maximum cable length of 10 m to the gauge. Interfaces include PROFINET, PROFIBUS DP, TCP/IP, and hardware options.

Environmental and Power Requirements

• Power supply: 3 x 380 – 460 V AC, 50 – 60 Hz, 3 kW
• Protection class: IP65 for C-frame, IP55 for control unit
• Operating temperature: 5 – 55 °C for C-frame, 5 – 45 °C for control unit
• Compressed air quality: DIN ISO 8573-1 standards

Options and Additional Features
The VTLG models can measure metal strips at speeds up to 2,000 m/min and temperatures up to 180 °C. Data recording and statistical evaluation are supported through VRecoS and VGraph software.

Contact Information
Friedrich Vollmer Feinmessgerätebau GmbH, Verbandsstraße 60 b, 58093 Hagen, Germany. Phone: +49 2334 507-0, Fax: +49 2334 507-199, Email: [email protected]