Flatness Measuring Roll

Flatness Measuring Roll

The flatness measuring roll (BFI principle) consists of a solid roll body equipped with a project-specific number of piezoelectric sensors.

The sensors are distributed over the entire roller body as required for the specific measurement task.

The measured value of each sensor is amplified in the roll body, digitised and transferred from the rotating part (rotor) to the static part (stator) of the flatness measuring roll via an optical and wear-free rotary transmitter.

strip flatness measurement (tensile stress distribution)

– relative strip temperature profile measurement
– high temperature roll up to 300°C
– drive system

Special Features

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Flatness Measuring Roll

Flatness Measuring Roll

Technical Information

Material data

Typical thickness range:

0.006 – 10 mm, but not limited to

Max. speed:

2,000 m/min, but not limited to


up to 2,800 mm, but not limited to


not limited / continuous inspection

Measurement system data

Gauge type:

Force Measurement
(Piezo-quartz sensors in single wire technology)

Max. Measurement density (number of measurement points per metre of strip):

96 standard version
192 special version


contactless rotary transformer with charge amplifier
(24-channel standard version, 48-channel special version)

Measurement accuracy

Measuring range per zone:

0.2–60,000 N

Max. mechanical load per zone without the need to recalibrate the roll:

72,000 N

Dynamically measurable force change per zone:

0.2 N

Accuracy of the measuring device (2σ):

1I-Unit or 10 μm/m

IMS Measuring Systems for Aluminium Rolling Mills

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IMS Measuring Systems for Aluminium Cold Rolling Mills