China Neodymium And Ferrite Magnets Manufacturer & Supplier 
Gas flow meters are critical instruments in industrial measurement, widely used across petroleum, chemical, metallurgical, and power industries. Magnets are employed in many types of gas flow meters. Today we will discuss the function of gas flow meters magnets, their materials, installation locations, and selection considerations.
First, let's discuss the role of the magnet in gas flowmeters. The magnet in gas flowmeters is not used for adsorption or fixation, but rather serves as a signal transmission and isolation component. For instance, in types such as vortex precession flowmeters and turbine flowmeters, the fluid drives the internal impeller or rotor to rotate. The permanent magnet mounted on the rotor generates a periodically changing magnetic field. An external sensor (such as a Hall element) detects this magnetic field change and converts it into an electrical signal. This design achieves complete isolation between the measurement chamber and the electronic part, ensuring both sealing and enhancing the reliability of the instrument. It is particularly suitable for applications where high sealing requirements are essential, such as gas and natural gas applications. Additionally, some gas flowmeters may require the magnet to play a role in driving and positioning.
In terms of magnet materials, commonly used magnet types for gas flowmeters include sintered ferrite magnets and injection-molded ferrite magnets, and bonded or injection-molded neodymium iron boron can also be used.
Permanent magnet for flowmeter
Where is the magnet installed?
On the impeller of the gas flow meter. When gas flow drives the impeller to rotate, the periodic changes in the magnet's magnetic field are detected by the associated Hall effect sensor.
Selection requires consideration of the magnet's long-term stability, resistance to temperature, humidity, and gas corrosion, as well as the sensor's sensitivity and measurement accuracy. Ferrite magnetic rings are suitable for mechanical designs or applications with less stringent signal requirements, seeing significant use in residential gas metering. Bonded neodymium-iron-boron magnetic rings are widely adopted in smart gas meters and small-bore gas flow meters.
The above covers the function, material selection, and application of magnets in gas flow meters. Should your company require flow meter magnets or magnetic rings, please contact us for samples and pricing.
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