Which element is described as not being part of the control loop and displays measurements in the field?

The correct answer, Direct Location Indicators, refers to devices that provide visual measurements directly in the field without being part of the control loop. These indicators display essential process parameters such as temperature, pressure, and flow rates, allowing operators to monitor conditions at a glance.

Direct Location Indicators are crucial for quick assessments and on-site decision-making because they present real-time data visually, enabling a fast response to changes in the process. These indicators operate independently of the control loop, meaning they do not influence or regulate the process directly. Instead, they serve as a supplementary tool for operators to gauge system performance and operational status.

In contrast to Direct Location Indicators, remote indicators relay information back to a control room or central monitoring system, and controllers actively manage the process by receiving data and adjusting valves or other final control elements. Final control elements, such as valves and actuators, directly alter the process based on commands from controllers. Thus, the key distinction is that Direct Location Indicators convey information visually but do not participate in the automated control actions of the overall system.