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Wireless real time temperature measurement for process control in high temperature environments

: Marx, Michael; Meyer, Frederic; Grundmann, Kai; Grabmaier, Anton


AMA Service GmbH, Wunstorf:
AMA Conferences 2017. Proceedings : Nuremberg Exhibition Centre, Germany, 30.5.-1.6.2017; Proceedings; SENSOR 2017, 18th International Conference on Sensors and Measurement Technology, IRS² 2017, 15th International Conference on Infrared Sensors & Systems; CD-ROM
Wunstorf: AMA Service, 2017
ISBN: 978-3-9816876-4-4
International Conference on Sensors and Measurement Technology (SENSOR) <18, 2017, Nuremberg>
International Conference on Infrared Sensors & Systems (IRS2) <15, 2017, Nuremberg>
Fraunhofer IMS ()
industrial process control; wireless; real-time; low power; thermocouples; high temperature wireless electronic; wireless sensor; TDMA

In inductive soldering processes, it is crucial to accurately control the temperature of the workpieces moving through the process. In conventional systems, the actual temperature is measured by multiple thermocouples (TCs) with wired connections to the process controller. In this paper, a wireless temperature measurement system for industrial applications is presented. The solution consists of multiple mobile wireless sensor nodes (SNs). To each SN, up to four TCs can be connected. The SNs are designed for operating temperatures of up to 125 °C, while TCs can easily measure temperatures of 2,500 °C. To save battery power, the SNs are active only when they are within a running production process. Therefore, before entering a part of the process where their measurement values are required, the SNs are woken up by LF antennas placed at suitable locations. Up to 84 SNs transmit their measurement values to a base station (BS) via a deterministic real time protocol. The BS communicates with the process controller via a USB interface (optional: Ethernet, CAN or Profibus).