Industry new

Gas Mass Flow Meter Type - Focus on Microfluidic Control Technology

The measured flow differential pressure measurement technology is one of a variety of flow measurement technologies. This article will briefly introduce the current major gas flow measurement methods.

Laminar flow meter
Laminar mass flow meters use the differential pressure across the laminar flow element to measure the mass flow of the fluid. When the fluid in the turbulent state passes through the laminar flow element, the laminar flow is made by narrowing the distance between the laminar sheets and changing the fluid velocity. The pressure difference sensor detects the pressure difference at both ends of the laminar flow sheet, and thus can pass through the Poiseuille leaf. The law calculates the volumetric flow rate, which is then converted to mass flow rate with the correct density at the known temperature and pressure.
Alcat's range of gas mass flow meters & mass flow controllers, water flow meters & water flow controllers use laminar pressure differential technology.
Thermal mass flow meter
Thermal flow meters measure the flow of fluid through changes in heat. There are usually two methods. * The method is to measure the current required to keep the temperature of the heating element constant. When the fluid flows through the heating element, the gas particles in contact with it will carry away the heat on the surface. When the flow rate increases, the required temperature of the heating element is not maintained. The larger the current, the current is proportional to the mass flow. Another method is to measure the temperature at both ends of the heating element or the live wire. When the fluid passes through the heating element, it will take away the heat on its surface. Therefore, the temperature of the front of the heating element is higher than the back end, and the temperature difference between the two ends and the mass flow rate through the fluid. In proportion.
Coriolis mass flowmeter
Coriolis flow meters use the Coriolis effect to measure the mass flow of a fluid. Pass the fluid through one or two side-by-side U-tubes to oscillate the U-tube. The Coriolis force acting on the fluid particles is perpendicular to the vibration and flow direction. When the pipe vibrates upwards, it acts downwards, but because the fluid overflows the U-shaped pipe its force upwards, so that a torque is generated; when the pipe vibrates downwards, it is the opposite. The torque in the U-tube is directly proportional to the mass flow through the fluid.
Ultrasonic mass flowmeter
Ultrasonic flow meters use sound waves to measure fluid flow. The Doppler flowmeter transmits the ultrasonic signal to the fluid. After being reflected by the particles and bubbles in the fluid, the velocity of the fluid can be measured by measuring the frequency change between the transmitted wave and the received wave. A time-of-flight mass flow meter uses the change in frequency between a transmitted wave and a received wave to measure the velocity of a fluid.
Variable cross-section mass flowmeter
Variable cross-sectional mass flow meters or rotameters measure the flow of fluid through pipes and suspensions. When the fluid passes through the pipeline, the suspended matter begins to rise. When the buoyancy and gravity are balanced, it tends to be stationary. The mass flow is calculated by measuring the height of the suspended material in the pipeline at this time.

PREVIOUS：NPT thread, PT thread, G thread and metric thNEXT：Differential Pressure Mass Flow Meter Operati