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The TMS (Thickness Monitoring System) has been developed to continuously measure the thickness of non-magnetic materials such as paint, plastic, paper, copper, aluminum, wire and felt. This highly effective method enables the non-contact monitoring of thickness as the gauge floats on an air cushion. Measurements are carried out using a reference surface of magnetic conductive material, specifically either the material itself or a support roller in the machine. Neither radioactive components nor laser beams are used in the system. To provide accurate point or profile measurement, equipment can be placed at different angles on a fixed or traverse conveyor belt. Finally, the system reports on-line so that instant adjustments to production can be made.
 Sensor
The newly developed TMS sensor comes with three stepping motors. These will automatically hold the sensor at the correct angle relative to the monitored material and the sensor tip can be manufactured for specific diameters of the roller. This automated precision adjustment means that your operator will have to perform less maintenance work, there will be fewer operational disturbances and precise results will be provided as well as experienced improvements in the process control.
Non-Contact Monitoring
The TMS system has been designed for non-contact monitoring as the sensor floats approximately 80 µm on an air cushion above the monitored material. The sensor applies the principle of magnetic reluctance measuring to ensure a highly improved stability in readings is achieved. This contrasts a regular inductive sensor which involves issues with variations in temperature and irregularity of material. The sensor is capable of generating output upon installation into a production line and its production settings can be immediately adjusted. In case of a paint coating installation, measurement must take place after the drying oven, otherwise the air cushion will affect the coating surface. A reference sensor compensates for changes in sheet thickness and another measures primary coating.
Traversing
 The sensor can be placed on either a single or double travelling carriage of varying scan widths and is mounted on an air cylinder for lifting at passing joints or for service purposes. Inductive proximity sensors are used to keep the measuring unit on the surface of the sheet.
Measurement Values
Measured values are displayed on a computer monitor that is located near the operator and are presented through plain graphs, figures and a trend recorder. The system is based on microprocessor technology and the settings, comparisons and filter functions are computerized. The measurement values are stored in a database and can be collected for extended analysis and evaluation. In cases where the measurement values are abnormal, a clear text warning presenting events and alarms is displayed on the monitor.
Documentation
TMS.pdf
Film
Technical Specifications
| Measuring range: |
Selectable from 0-300 µm up to 0-10 mm |
| Response time: |
100 ms |
| Accuracy: |
+/- 3 µm at measuring range 300 µm |
| Resolution: |
1 µm on the display and the output up to 4 mm and 5 µm up to 10 mm |
| Temperature range, sensor: |
0-70 °C |
| Output: |
Analog 4-20 mA, max 800 ohm, galvanically isolated, Ethernet, Serial RS-485 and CAN-bus for internal communication |
| Display: |
Flat panel Display for operators and 2 rows LCD on the sensor amplifier |
| Enclosure, Electronic Cabinet: |
Steel cabinet 800*800*300 mm, IP65 |
| CE Approval: |
EN50081-2: 1993, EN50082-2: 1995, 89/336/EEC |
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