What is the main function of a transmitter in a control loop?

The main function of a transmitter in a control loop is to convert signals to a displayable form. In control systems, transmitters are critical components that take physical measurements—such as temperature, pressure, flow rate, or level—and convert these measurements into standardized electrical signals, typically in the form of voltage or current. This conversion allows the information to be easily transmitted and interpreted by control systems or monitoring devices, thereby enabling real-time visualization and control.

Transmitters play a crucial role in facilitating communication within a control loop by ensuring that the relevant data is adequately prepared for processing and display. This function supports operators and automated control systems in making informed decisions based on accurate, up-to-date information regarding the process conditions.

The other options provided might describe related activities within a control loop but do not directly define the primary role of a transmitter. For instance, eliminating setpoint deviation is achieved through control actions, not the transmitter itself. Storing data for analysis pertains more to data logging systems, and comparing variables is a function often associated with controllers or processing units rather than the transmitter.