Level, pressure, flow, and temperature are examples of what?

Level, pressure, flow, and temperature are categorized as measured variables because they represent specific physical quantities that can be quantitatively expressed and monitored in various systems, especially in power engineering and industrial applications.

These variables are critical in understanding the operating conditions of a system. For instance, level pertains to the amount of liquid in a vessel, pressure indicates how forcefully a fluid is acting within a system, flow describes the movement of fluids, and temperature reflects the heat content of a substance. Measured variables are fundamental for control and monitoring, providing essential data that operators need to maintain efficiency, safety, and performance in a facility.

In contrast, transmitters are devices that convert these measured variables into signals that can be read and interpreted. Sensing elements are the components that detect changes in these variables, while manipulated variables refer to the inputs that are adjusted in a control system to influence the process. Understanding this distinction helps clarify the role each term plays in process control and instrumentation.