Short Description
Temperature is the most frequently measured parameter in the process industry.
In electrical, contact thermometers two measurement principles have asserted themselves as a standard:
RTD: resistance sensors
In RTD resistance sensors the electrical resistance changes with a change in temperature. They are suitable for the measurement of temperatures between -200°C and +800°C and stand out due to high measurement accuracy and long-term stability. The resistance sensor element most frequently used is a Pt100 that has a nominal value of 100O at 0°C. Pt100 sensors are manufactured in different formats:
- Wire wound ceramic sensors: a spiral of platinum wire is wound and embedded in ceramic powder within a capillary and is fed to the outside by platinum wires.
- Thin film sensors: a platinum layer is vaporized on a ceramic plate (sputtered). A glass layer is melted on in order to protect the connection wires and the platinum layer.
As a standard, Endress+Hauser RTD resistance sensors fulfill the IEC 0751 accuracy class F 0.15.
