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Magnetic Flow Meters - Electromagnetic Induction

Updated on February 29, 2012

Magnetic Flow Measurement Can Reduce Costs

photo by autowitch on Flickr
photo by autowitch on Flickr

Electromagnetic Flow Meters: Buy Quality

There are seemingly countless different ways that companies have invented to obtain accurate flow measurement data whether one is measuring the flow of gas or liquids in a pipe. These range from the caveman primitive bucket and a stopwatch method to the more advanced ultrasonic flow meters and magnetic flow meters. Each method makes use of a different set of physics principles in order to get a flow measurement reading. The product line of magnetic flow meters make use of Faraday's electromagnetic induction principle and there are a few important tips to know when looking to buy a magnetic flow meter for company use.

The mounting type of the mag meter is going to be one of the most important purchasing criteria as the selection will be based on the type of system flow measurement will be made on. There are the basic in-line magnetic flow meters which are mounted, as the name suggests, in line with the piping system. This requires a breakage in continuity and open systems as the process may need to be shutdown and pressure removed during the mounting installation. A second less invasive magnetic flow meter mounting type insertion mount. In this type of flow meter a series of holes are drilled at the measurement location and from there threaded fittings are installed into the process pipe. If a company or business needs to utilize the advanced technology of magnetic flow meters but would like to do so on a closed system or simply forgo the complications of one of the previously mentioned invasive mag meters, then the best buying option is the non-invasive type of electromagnetic flow technology that does not require any interruption in the system process. Mounting type is one of the top features that will direct one to the proper mag meter.

The magnetic flow meters apply an electromagnetic field through the metering tube part which results in a potential difference which can measured. The measured potential difference on the readout will be proportional to the flow velocity. Generally, the use of a magnetic flow meter will require the liquid being measured to be conductive and will also require a nonconducting pipe liner. Pulses are necessary to avoid stray potential difference that might otherwise skew the sensor measurement. Of course, you will need to get a mag meter which matches the diameter of the process pipe and choose whether to go with a battery operated or outlet powered model. The higher end models can have analog outputs as well as the digital lcd display outputs. These can be tied into a circuit with other sensors or monitoring equipment to signal readings to other machinery. Finally, the pressure is an important metric and the magnetic flow meter should be one that is rated to suit the application.


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