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Liquid Flow Equipment Controllers Measuring the fluidity of liquids is critical in industrial applications. In some cases, the skill of conducting accurate flow measurements is so vital that even a minute difference can either lead to a profit or a loss. In other situations, inaccurate flow measurements or failing to take measurements can lead to serious and disastrous results. The most liquid flow equipment controllers determine the flow rate inferentially; either by noting changes in kinetic energy or measuring the fluid’s velocity. The velocity of fluid will depend on a pressure differential that forces the liquid through a conduit or pipe. Since the pipe’s cross-sectional area will always remain constant, the flow rate is the average velocity.
How does a liquid flow controller work?
A liquid flow controller also referred to as metering flow of liquid, typically has an inlet that receives the liquid. This inlet passes the liquid via a high resistance liquid flow path, during which a pressure drop occurs. The pressure sensor will measure the amount of liquid flow and generates a pressure drop signal. This signal is fed into an electronic circuit. A temperature sensor is positioned in the high-resistance liquid flow-path which will generate a temperature signal that is fed into the electronic circuit. The electronic circuit will create a viscosity-normalized flow signal which will be compared to a set point; thus generating an error signal. In the downstream path of the high-resistance liquid flow is a valve which controls the flow of liquids. It is driven by an error signal and will monitor the flow.