Gauge head - PMGG123

Contact-free measurement and a robust design makes The Millmate Thickness Gauge a thickness gauge that will provide high availability and hassle-free operation in harsh industrial environment.

The gauge has no fragile parts or parts that will age. Therefore the MTG provides a superior long-term stability. From a maintenance point of view the system is the most dependable thickness gauge on the market.

An aluminium-bronze housing is used as a case for the measuring coils and the electronics. The measured thickness deviation and other signals from the gauge are transferred to a control unit via fieldbus communication.

Only a few certified plates (included in delivery) are needed to calibrate the system to cover the complete measuring range. After calibration at commissioning, the system measures any non-ferrous material or alloy without additional calibration.

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Data
Application
Technology
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Data

Type PMGG 123-S PMGG 123-F
Min. thickness
for low alloyed copper and aluminum 0.010 mm (foil mode) 0.010 mm (foil mode)
0.025 mm 0.025 mm
for high resistivity material (450 nΩm) 0.040 mm (foil mode) 0.040 mm (foil mode)
0.100 0.100
Max. thickness 15 mm 6 mm
Repeatability ±0.03%
(not better than 0.3 μm)		 ±0.03%
(not better than 0.3 μm)
Total Accuracy
(relative permeability=1.0)		 Non-ferrous metals Non-ferrous metals
strip thickness > 2.0 mm ±(0.05% + 2 μm) ±(0.05% + 1.5 μm)
strip thickness < 2.0 mm ±(0.1% + 1 μm) ±(0.1% + 0.5 μm)
Min. strip width 250 mm 140 mm
Strip position
for changes faster than 1 mm/s ±5 mm ±3 mm
for changes slower than 1 mm/s ±10 mm ±8 mm
Strip slope ±3° ±3°
Step response 15 ms 15 ms
Operation temperature +5 - +55°C +5 - +55°C
Degree of protection IP 65 IP 65
Power supply (from the control unit) 24 V DC, max. 3 A 24 V DC, max. 3 A
Dimensions (W x D x H)
Gauge without holder 198 x 425 x 302 mm 160 x 425 x 293 mm
Weight
Gauge 50 kg 37 kg
Gauge holder 30 kg 30 kg

Application

The heavy-duty design of the gauge and the stability of the measuring principle makes the Millmate Thickness Gauging System superior in applications that previously were considered impossible. Measurement can be done close to the rollgap, without removal of emulsion.

Material
The MTG is designed for dependapble gauge measurement on a wide range of non-ferrous materials with different alloy compositions and resistivities, i.e. aluminium, copper, zinc, tin, lead and beryllium.

Single or Double gauge system
In reversing mills it is very common to use thickness gauges on both sides of the mill. The MTG system offers two different contol units, one for handling a single gauge and the other for handling two gauges. The user-friendly operator unit has a display function for double gauge configuration. The operator can see the thickness gauge deviation graphs, one for each gauge, on the same menu page.
The feature with double gauge systems can also be valuable in applications like tandem mills or slitting lines.

Sledge
As an option ABB offers a sledge design with a number of stroke lengths. It is the difference between strip width (min./max.) used in the mill that mainly decides how the sledge should be designed for each specific application. The sledge motion range should be designed so that the gauge can be fully withdrawn from the strip.

Pulsed Eddy Current technology

The Millmate Thickness Gauging system is based on the Pulsed Eddy Current technology, which uses magnetic fields for measurement of the strip thickness. The interaction between an applied magnetic field and the electrically conductive strip indicates the thickness - without influence from material composition or conditions in the measuring gap.

Phase 1: Transmitting

  • An electric field is generated with a transmitting coil
  • The field is applied until it fully penetrates the strip
  • The field "energy" is stored in the air gap and in the strip
  • The amount of energy stored in the strip depends on the thickness alone - not on resistivity

Phase 2: Distance measurement

  • Fast air response just after transmit field is swithed off
  • The measurement of air gap energy corresponds to distance between coil and strip
  • Pulse time t1 is typically less than 5μs

Phase 3: Resistivity measurement

  • Response from the surface area of the strip
  • The measurement starts when the air gap signal has declined
  • The measurement of the surface response corresponds to resistivity and is dependent on the speed of the field leakage out of the strip

Phase 4: Thickness measurement

  • Response from the whole strip
  • The measurement starts when the air gap signal has declined (phase 3 is included in phase 4)
  • The measurement of the whole strip corresponds to the complete energy stored in the strip, and continues until the strip response has almost declined (t3)
  • The measurement corresponds to the strip thickness
  • The resistivity does not affect the level of the whole strip response
  • The tail part after t3 is calculated with the use of the resistivity part

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