Peel from the case to the element. Follow the resistance measurement path through this conceptual model.
Return to the RTD chapter discussion
Drag to rotate; pinch to zoom. With the view focused: arrow keys rotate, + / − zoom, 1–3 choose a layer, Home resets rotation and zoom. Step advances to the next layer; Reset returns to the case and default view. Layer buttons select a view directly. The page does not move on its own.
The coating covers the RTD body, with two leads extending below it.
Teaching view: A protective coating covers the platinum sensing film on a pale support. Peel it away to see the metal element whose resistance changes with temperature.
The coating covers the RTD body, with two leads extending below it.
Teaching view: A protective coating covers the platinum sensing film on a pale support. Peel it away to see the metal element whose resistance changes with temperature.
An external circuit supplies current to measure the RTD resistance. [Under the Hood: When Beta Isn’t Enough]
Teaching view: Two leads connect the platinum film to an external circuit. The circuit passes a small known current through the film and measures the voltage across it. It uses that voltage to calculate resistance, then temperature.
The sensing element is a platinum coil or film. [Cheap Nonlinear Thermistors]
A platinum RTD changes resistance with temperature. [Cheap Nonlinear Thermistors] [Under the Hood: When Beta Isn’t Enough]
Teaching view: The platinum film follows a folded path on a pale insulating support. Its resistance changes with temperature, giving the readout a temperature-dependent resistance to measure.
Explode separates the proposed layers; X-ray makes the case translucent. These are teaching views. No commercial sensor construction or wiring is specified.