A circular chart recorder incorporates what feature?

A circular chart recorder is characterized by its ability to incorporate a bourdon tube as part of its design. A bourdon tube is a mechanical element used to measure pressure and convert it into a rotational movement, which then translates onto the recording medium of the circular chart.

This relationship is important because the bourdon tube allows the recorder to accurately capture and display pressure changes over time on a circular chart that continuously rotates. As pressure fluctuates, the bourdon tube expands or contracts, causing a pointer to move around the chart and create a graph of these variations. This feature is integral to the operation of circular chart recorders, making them effective for ongoing monitoring of systems where pressure is a critical parameter.