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S B E M Series 151 Electro Magnetic Flow Meter |
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An Electro Magnetic Flow Meter is a volumetric flow meter which does not have any moving parts and is ideal for wastewater applications or any dirty liquid which is conductive or water based. Electro Magnetic Flow Meter will generally not work with hydrocarbons, distilled water and many non-aqueous solutions. Electro Magnetic Flow Meters are also ideal for applications where low pressure drop and low maintenance are required. |
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Operating Principle
The operation of an Electro Magnetic Flow Meter is based on Faraday's Law, which states that the voltage induced across any conductor as it moves at right angles through a magnetic field is proportional to the velocity of that conductor.
Faraday’s Formula
E is proportional to V x B x D where:
E = The voltage generated in a conductor
V = The velocity of the conductor
B = The magnetic field strength
D = The length of the conductor
To apply this principle to flow measurement with an Electro Magnetic Flow Meter, it is first necessary to state that the fluid being measured must be electrically conductive for the Faraday principle to apply. As applied to the design of Electro Magnetic Flow Meters, Faraday's Law indicates that signal voltage (E) is dependent on the average liquid velocity (V) the magnetic field strength (B) and the length of the conductor (D) (which in this instance is the distance between the electrodes). In the case of wafer-style Electro Magnetic Flow Meter, a magnetic field is established throughout the entire cross-section of the flow tube. If this magnetic field is considered as the measuring element of the Electro Magnetic Flow Meter, it can be seen that the measuring element is exposed to the hydraulic conditions throughout the entire cross-section of the Electro Magnetic Flow Meter. With insertion-style flow meters, the magnetic field radiates outward from the inserted probe.
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| S B E M Series 151 Electro Magnetic Flow Meter Installation |
| Electro Magnetic Flow Meter Selection |
| Important queries determining selection of an Electro Magnetic Flow Meter are: |
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Is the fluid conductive or water based? |
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Is the fluid or slurry abrasive? |
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Do you require an integral display or remote display? |
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Do you require an analog output? |
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What is the minimum and maximum flow rate for the flow meter? |
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What is the minimum and maximum process pressure? |
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What is the minimum and maximum process temperature? |
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Is the fluid chemically compatible with the flow meter wetted parts? |
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What is the size of the pipe? |
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Is the pipe always full? |
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Now, watch out for the next generation of……. |
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ULTRASONIC FLOW METERS |
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| Electro Magnetic Flow Meter |
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