测头
PMGG123

高精度和非接触式测量使Millmate测厚仪非常适用于处理线和成品质检。
恶劣的环境条件、经常变化的材料合金成分都会影响X射线测厚仪的精度，而对于Millmate测厚仪，这些影响都不存在。

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数据
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数据

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

应用

Millmate 测厚仪基于PEC 原理，应用电磁感应测量带材厚度。通过磁场和导电材料之间的测量厚度。这种测量原理不受材料合金变化和测量区内环境变化的影响。
 
Material
材料独立，无需合金补偿—所有有色金属材料。MTG都可以在不使用合金补偿系数的情况下测量。

单测头或双测头系统
可逆轧机在轧机出口和入口处都需要安装测厚仪。 MTG系统提供两种控制器。一种处理单测头，一种处理双测头。同时操作员站也具有同时显示双测头画面的功能。
操作员站可在同一画面上显示两个测头的厚差图。
上述功能在多机架轧机和剪切线上也有广泛的应用。

滑轨
测头支架安装在滑轨上，可沿滑轨水平方向进入到测量位。ABB提供多种型号的标准滑轨。根据带宽的最大值和最小值选择不同的滑轨。详细的滑轨选型，请咨询当地的ABB技术人员。

PEC脉冲涡流技术

Millmate 测厚仪基于PEC 原理，应用电磁感应测量带材厚度。通过磁场和导电材料之间的测量厚度。这种测量原理不受材料合金变化和测量区内环境变化的影响。

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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