Millmate Strip Scanner Edge Position Sensor (PMSG12x)
The Millmate Strip Scanner Edge Position Sensor is a brilliant solution to the problem of determining strip edge position during the rolling and post-treatment of metal strip. Satisfactory metal strip measurement and control of the edge position can lead to a significant improvement in production economy.
Overview
The Millmate Strip Scanner Edge Position Sensor is a complete unit, enclosed in corrosion-resistant aluminium-bronze. In the edge sensor there are a number of electrical coils and certain circuits for signal processing. The interior of the edge position sensor is well protected by the rugged case and tight-fitting cover. The sensor can easily withstand dirt, liquids and a corrosive environment. Metal strip 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.
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 outstanding measurement result will be obtained if the following points are borne in mind when installing 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.
Strip thickness range
Aluminium 0.005 – 20
<p>mm</p>Steel 0.1 – 20
<p>mm</p>Stainless steel 0.3 – 20
<p>mm</p>Technical Data
Measuring distance 0 – 50
<p>mm</p>Minimum strip width 220
<p>mm (depending on installation)</p>Operation temperature +5 – +70
<p>°C</p>Measurement start time 300
<p>ms at strip head</p>Measurement time constant t ≥ 10
<p>ms (selectable)</p>Step response 20
<p>ms (selectable)</p>Product Data
| Data | |
| Accuracy | ±0.5 mm/edge at 10 – 40 mm distance ±1 mm/edge at 0 – 10 mm and 40 – 50 mm distance |
| Strip width | 350 mm (PMSG 123) 820 mm (PMSG 125) |
| Weight | 50 kg (PMSG 123) 75 kg (PMSG 125) |
| Protection | IP 65 |
| Air consumption | 1 dm³/s at 0.5 bar |
Measurement technology
<p>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:</p>