Thin-film RTDs are platinum elements that are constructed by placing a sensing platinum layer over a ceramic substrate, covered with passivation glass layers. This results in excellent shock and vibration resistance and protects the Pt sensor element from environmental influences.
The platinum wire of a ceramic wire-wound Pt100 sensor is wound into a small coil that is inserted into the holes of a high purity alumina tube. The ODs of these high purity alumina tube varies from 0.8 mm to 4.5 mm, so they are even suitable for the thinnest RTD mineral insulated cables.
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