Process Indicator and Process Controller are two types of devices commonly used in industrial automation and control systems to monitor and manage various processes.

Process Indicator: A process indicator, also known as a process display or process meter, is a device used to monitor and display the real-time values of process variables such as temperature, pressure, flow rate, level, humidity, or any other measurable parameter in an industrial process. The indicator typically provides a numerical readout or a digital display showing the current value of the process variable. Process indicators are essential for operators and engineers to have a clear understanding of the ongoing process and ensure that it is operating within the desired range or setpoints. They are commonly used in manufacturing plants, refineries, power generation facilities, and other industrial environments.

Process Controller: A process controller, also known as a controller or control system, is a device used to regulate and maintain a process variable at a specific setpoint or target value. The controller continuously compares the measured process variable from sensors (e.g., temperature sensor, pressure transducer) with the desired setpoint and then adjusts the process through control actions to keep the variable close to the setpoint. The control actions can involve activating actuators like control valves, motors, or heaters to maintain the process within the desired range.

Process controllers are crucial for maintaining product quality, process efficiency, and safety in industrial operations. They play a vital role in automating processes, reducing human intervention, and ensuring consistency in manufacturing and production environments.

In many industrial setups, process indicators and controllers can be integrated into a single unit called a “Process Indicator-Controller,” which provides both monitoring and control capabilities for a specific process variable.