The differences between the four commonly used flow meters

Comparison of the usage differences of four commonly used flowmeters

Turbine flowmeter

When fluid flows through a turbine flowmeter, the fluid causes the rotor to rotate. The rotation speed of the rotor is related to the speed of the fluid. The flow rate or quantity is derived from the average velocity of the fluid felt by the rotor. Turbine flow meters can accurately measure clean liquids and gases. Like PD flowmeters, turbine flowmeters also produce unrecoverable pressure errors and require moving parts.

Electromagnetic flowmeter

When a conductive fluid flows through an electromagnetic field, the velocity of the fluid can be obtained by measuring the voltage. Electromagnetic flowmeters have no moving parts and are not affected by fluids. The degree of conductive liquid measured when the tube is full is very high. The electromagnetic flowmeter of Shanghai Automation Instrument Co., Ltd. can be used to measure the flow rate of slurry fluid.

Acoustic flowmeter

The propagation time method and the Doppler effect method are methods commonly used by acoustic flowmeters to measure the average velocity of fluids. Like other speed meters, it is a meter that measures volumetric flow. It is a flow meter. If the acoustic transmitter is installed outside the pipe, there is no need to insert it. It is suitable for almost all liquids, including slurries, with high purity. But the filth of the pipes will affect the temperature.

Vortex flowmeter

A vortex flowmeter is a non-streamlined vortex generator placed in the fluid. The speed of the vortex is related to the speed of the fluid. into a certain proportion, thereby calculating the volumetric flow rate. Vortex flowmeter is suitable for measuring liquid, gas or steam. It has no moving parts and no dirt issues. Vortex flowmeters produce noise and require a high flow rate from the fluid to create vortices.

Thermal mass flow meters

Measure fluid velocity by measuring the increase in temperature of the fluid or decrease with a thermal sensor. Thermal mass flow meters have no moving parts or holes and measure the flow of gases. Thermal mass flow meters are one of the few technologies that can measure mass flow and are also one of the few technologies used to measure large-diameter gas flow.

Coriolis flowmeter

This flowmeter uses a vibrating fluid tube to produce deflection corresponding to the mass flow rate to measure. Coriolis flow meters can be used to measure the mass flow of liquids, slurries, gases or steam. High degree. However, regular maintenance of the pipe wall is required to prevent corrosion.

Measurement principle: Faraday's law of electromagnetic induction proves that a conductor moving in a magnetic field will induce an electric potential. Using the principle of electromagnetic measurement, the fluid is a conductor in motion. The induced potential is proportional to the flow rate and is detected by two measuring electrodes. It is then amplified by the transmitter and the flow rate is calculated based on the pipe cross-sectional area. A constant magnetic field is generated by switching DC currents of alternating polarity. The measuring system consists of a transmitter and a sensor.