An Electromagnetic Flowmeter, also known as a Magnetic Flux Meter is a transducer that measures fluid motion by its alternating magnetic field induced across the fluid by its dynamic pressure. This type of measurement is useful for numerous applications and is particularly suitable for the measurement of the production and flow rate of large-scale fluid systems. There are several types of Electromagnetic Flowmeter that include the following:
The most common Electromagnetic Flowmeter is the DC input model. It measures the alternating magnetic field produced by power supplies and generally has a higher efficiency than other forms of flow measurement. A DC input Electromagnetic Flowmeter typically has a port wherein the fluid can be placed. Then, an alternating magnetic field imparts alternating current through the fluid and its surrounding area. Generally, the measurement is done after the fluid passes through the transducer.
Another type of Electromagnetic Flowmeter is the resistive-magnet version. It utilizes the concept of magnetism to induce fluid flow. Usually, it has two ports wherein fluid can be placed. As the fluid passes through the port, it will generate a small amount of magnetic force, which then exerts a downward force on the conductive liquids that are present in the two ports. The minimum conductivity measurement of this type of Electromagnetic Flowmeter is often used for various fluid sampling applications, such as the manufacture of oils and lubricants or the determination of the viscosity of various oils and other liquid samples.
In the second type of Electromagnetic Flowmeter, the electrical motor is used to induce electrical currents through the fluid. The electrical motor creates a continual, even flow of fluid through the pipe. Generally, the motor is placed inside a pipe or it could also be run outside the pipe. To achieve this, a special pipe is made with a hole at its bottom section. When the fluid passes through the pipe, it causes the bottom portion of the pipe to sink into the hole. This type of Electromagnetic Flowmeter is very useful for the measurement of the resistance of liquids flowing through the pipe.
A third type of Electromagnetic Flowmeter is the Teflon-coated pipe. A Teflon-coated pipe contains holes, which are covered by a Teflon material. The holes present on the surface of the Teflon material are actually the carriers of the electrical current running through the pipe. Compared to other types of Electromagnetic Flowmeter, this particular type is the cheapest. However, it does not provide as accurate results as other types do.