Millmate Strip Scanner Edge Sensor

PMSG12x

The Millmate Strip Scanner Edge Sensor is a brilliant solution to the problem of determining strip edge position during the rolling and post-treatment of metal strip. Satisfactory measurement and control of the edge position can lead to a significant improvement in production economy.

The Millmate Strip Scanner Edge Sensor is a complete unit, enclosed in corrosion-resistant bronze. In the edge sensor there are a number of electrical coils and certain circuits for signal processing. The interior of the edge sensor is well protected by the rugged case and tight-fitting cover. The sensor can easily withstand dirt, liquids and a corrosive environment. Measurement is not influenced in any way by mill coolants. The immunity means that the edge sensor can be placed very close to or even inside the mill stand. However, there must be a metal-free zone above the edge sensor.
Data
Application
Measurement technology
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Data

Type PMSG 123/125
Strip thickness range

 Aluminium 0.005 - 20 mm

 Steel 0.1 - 20 mm

 Stainless steel 0.3 - 20 mm
Strip width
(edge position variation) 350 mm (PMSG 123)
820 mm (PMSG 125)
Measuring distance 0 - 50 mm
Inaccuracy at 10-40 mm        0-10 mm
                      40-50 mm
Off-center ±0.5 mm         ±1 mm
Edge position ±0.5 mm         ±1 mm
Width ±1 mm            ±2 mm
Weight 50 kg (PMSG 123)
75 kg (PMSG 125)
Operation temperature +5 - +70°C
Protection IP 65
Measurement start time 300 ms at strip head
Measurement time constant t ≥ 10 ms (selectable)
Air consumption 1 dm3/s at 0.5 bar

Application

The fundamental requirement for measuring strip edge position with the Millmate Strip Scanner System is that the edge of the strip runs over the active measuring area of the edge sensor.

One edge sensor is required for each strip edge. The sensor is mounted in the cross line of the strip and ideally, the top of the sensor should be parallel to the surface of the strip.

Metal-free zone above edge sensor.
There must be a metal-free zone above the edge sensor. Of course, this does not apply to the strip itself, which should run close to the edge sensor. For full accuracy at maximum measurement distance there must not be any metal objects in the metal-free zone.

Best measurement results
An oustanding measurement result will be obtained if the following points are borne in mind when insalling the system:
no metal objects in the metal-free zone above the edge sensor other than the strip itself
edge sensor to be protected from severe impacts from the end of the strip
strip to pass close to the edge sensor at smallest possible distance, 20 - 40 mm recommended

Measurement technology

A Millmate Strip Scanner Edge Sensor operates with weak pulsating electromagnetic fields, generated by a number of electrical coils in the edge sensor.

ABB’s patented Pulsed Eddy Current (PEC) technology makes it possible to measure accurately despite variations in material, environment conditions and measurement distance such as wavy edges and strip lift-off.

Three coils are used simultaneously. The partly covered coil at the strip edge measures a combination of strip distance and edge position. Together with the distance measurement of the two other coils a true edge position can be calculated, independent of material and distance.
In order to make measurement range wide enough, a number of measuring coils are arranged in line in the edge sensor. The relevant coils are automatically selected by the system itself.

PEC technology measurement phases

Phase 1: Transmitting

  • An electromagnetic field is generated with the coils transmitting
  • The field “energy” is stored in the air gap and in the strip

Phase 2: Position measurement

  • Fast air gap response just after transmit field is switched off
  • The measurement of air gap energy corresponds to strip edge position and to distance between coil and strip

Phase 3: Material compensation

  • The material dependent response from the surface area of the strip begins when the transmit field is switched off
  • The material signal measurement starts when the air gap signal has declined
  • The material signal is used to compensate for the surface response during the position measurement, giving true material independent position measurement

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