How Does A Mass Flow Controller Work?

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Mass Flow Controller (MFC) working principle | Bronkhorst

A mass flow controller is a tool to gauge and control the flow of liquids and gases in the system. A mass controller is a favored option for most measurements as it is not altered by stress and fluid state.
This strength gives it a favor in industries for accurate readings despite fluid state changes. But how exactly does a mass flow controller work?

Kinds of Flow Controllers

Controllers are classified according to how they are calibrated and reused. There are two main types of digital and analog. An analog flow controller is calibrated once to work with a special fluid.
Digital flow controllers, on the other hand, are versatile and can work as a liquid flow controller.

How it works

The device is divided into two parts, the CPU and the measurement portion. The flow part consists of a bypass, a special circuitry, a sensor, and a control valve. The CPU part of the circuit gives high efficiency and versatility.

A fluid is let into the system through an inlet joint where it flows between the bypass and the flow rate sensor. The role of the sensor is to record the mass flow rate of the fluid. As it provides the measurements, the control valve alters the flow depending on the noted signal. There is a valve to ensure that the measured flow rate and the incoming flow rate are equal.
The circuit works to control the stress and heat of the fluid to enhance accuracy.


  1. Fluid enters through the inlet and splits into two, with one part going through the sensor and the other part thrush the bypass.
  2. The sensor detects the flow that is converted to an electrical signal by the bridge circuit. The signal is always in proportion to the heat of the fluid.
  3. The signal goes through the amplification and correction circuits. The signal is output on a linear scale between 5 volts and 0. At the same time, the signal is sent to comparison circuits.
  4. The comparison circuits contrast the real flow setting signal from the sensor and the flow rate signal and alert the variation's liquid flow controller's valve.
  5. The valve alters the flow to ensure no difference in the flow depending on the liquid flow controller setting.


A mass & liquid flow controller is versatile and used in the control of many fluids. For better use and durability, you need to know the laws and the device's inner workings. A fair reading of this article gives an upper hand in handling the device and gaining efficiency.

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Article info


Published: 2021/01/18 - Updated: 2021/01/19
Total: 423 words

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