In the past, the easily confused industrial instruments we introduced were all similar in name. Today, we are going to introduce two instruments. Although they belong to the same category, they are not very similar in name, but many people still cannot tell them apart. They are vortex flowmeter and electromagnetic flowmeter. These are two very common industrial instruments in the field of flow measurement. In fact, in addition to the name, they still have many differences. Let us tell you about them:
Measurement principle
The vortex flowmeter uses the phenomenon that the vortex sheet generates vortex motion with the flow of the fluid, and calculates the flow rate of the fluid by measuring the rotation frequency or rotation speed of the vortex sheet; the electromagnetic flowmeter uses the principle of electromagnetic induction to measure the flow rate of the fluid by measuring the electromotive force received by the conductive fluid when it flows in the magnetic field. In principle, the difference between the two is obvious.
Structural form
The vortex flowmeter is composed of a vortex generator, a piezoelectric element, a flow guide and a magnetic circuit. The transmitter housing is die-casted with steel or aluminum alloy plates. The meter body and the sensor are combined into an integrated unit instrument; while the electromagnetic flowmeter is composed of a conductive tube, an excitation coil, a housing and electrodes, etc., and a secondary meter is installed at the upper and lower ends of the electrode.
Occasions of use
The vortex flowmeter is mainly suitable for measuring the flow of liquids, steam and gases, but not for measuring liquids with high viscosity, granular solid media and liquids containing foam and bubbles; while the electromagnetic flowmeter is suitable for measuring the flow of various conductive liquids, and cannot measure non-conductive media.
Output signal
The vortex flowmeter usually outputs a standard current signal of 4-20mA; while the electromagnetic flowmeter outputs a linear signal proportional to the flow rate.
Through the above analysis, it can be seen that there are actually many differences between vortex flowmeter and electromagnetic flowmeter. Obviously, the reason why many people still have misunderstandings is related to the lack of relevant professional knowledge and insufficient resolution. If it is difficult to effectively distinguish the differences between different flow meters, you can consult the manufacturer in detail and ask professionals to provide selection plans and provide professional guidance to avoid choosing the wrong type.