Tag Archive: level

Jan
27

WirelessHART – Level Switch

2160 WirelessHART Transmitter

In many tank level control applications, a level switch is installed and used as an interlock to help prevent overfilling the tank. For example, in many existing installations you may find a vibrating fork liquid level switch wired as an input to the control system. However, today it is possible to reduce the cost of installing a …

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May
27

Commissioning PI Control – Integrating Process

Three Element Drum Level Control

When the control objective is to maintain the controlled parameter of an integrating process at setpoint under all operating conditions, then using PI (proportional-integral or proportional plus reset) controller, it is possible to automatically compensate for changes in disturbance inputs and maintain the controlled parameter at setpoint. However, the application of PI control to an …

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Apr
25

Applications – Boiler Drum Level Control

Three Element Drum Level Control

The control systems commonly used in the process industry are based on the single-loop and multi-loop techniques described in Control Loop Foundation – Batch and Continuous Processes. Some combination of these techniques is often required to meet product specification and plant throughput targets. The application examples included in Chapter 16 of Control Loop Foundation are …

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