PID loops are a central component of modulating boiler control systems with applications ranging from basic steam header pressure control to cascading 3-element drum level control. A modern ...

Control valve selection plays a crucial role in optimizing control loop performance, and engineers must consider factors beyond just cost, leakage class and pressure drop. As explored in a Control ...

Learning the basics can ease loop tuning frustration and ensure stability. During plant operations, it seems that tuning control loops is an ongoing task, which can be a continual frustration to ...

At 11 sec.: Pressure begins to steady out and is held at its setpoint for the duration of the cycle, letting the wax solidify under pressure. Plots such as these can be used to diagnose motion ...

Each feedback loop would be involved in monitoring a different variable, such as pressure, flow, force, speed or temperature. The only additional component needed would be the sensor that provides ...

Closed loops are the key element of temperature control. They differ from open loop control by the fact that the input (the “Sensed Variable” aka “Controlled Variable,” see Figure 1) provides feedback ...

Just over a decade ago, an article titled, "Advanced Control Strategies Move into the Field" (Control, October 2008), highlighted three evolving trends in the process control world that would "make ...

Closed-loop control of these valves ensures an accurate, stable and linear flow rate without hysteresis. Repetition accuracy is rated at +/-0.25% of setpoint. These valves have a peak particle size ...

Mark C. Sellnau, Frederic A. Matekunas, Paul A. Battiston, Chen-Fang Chang, David R. Lancaster, Cylinder-Pressure-Based Engine Control Using Pressure-Ratio-Management and Low-Cost Non-Intrusive ...