Definition - What does Liquid-Level Controller mean?
Liquid-Level Controller is a device used for monitoring and comparing the level of liquid with a set value. The controller sends electric or pneumatic signals to the local control system, main control system or to the automated control valve directly. They are used for controlling the level of liquids in the applications of industrial refrigeration like liquid separators, flood evaporators and intermediate receivers. The controller communicates with the transmitter which measures the level of liquid continuously in the reservoirs. They are ideal for both non-conductive liquids such as oil or diesel and conductive liquids such as water.
Petropedia explains Liquid-Level Controller
The Liquid-Level Controller can dictate the valve to decrease or increase the flow of liquid from or to the reservoir after comparing the value measured with level set-point that was entered by the user. The controller sends electric or pneumatic signals which activate or deactivate the pressure switches, pumps, alarms, solenoids.
The following are the types of Liquid-Level Controller:
- Level Controllers: They automatically regulate dry or liquid material level values.
- Integrated motion controllers: They contain various matched components like motor drivers, encoders, motors, software, controllers and user interfaces.
- Pump Controllers: They are used to manage the pressure output and pump flow.
- Flow controllers: They allow metered fluid to flow in one or two directions.