(courtesy of Yokogawa)
In industry, there are a number of different technologies used to measure a physical property related to fluid motion, referred to as magnetic, ultrasonic, vortex, Coriolis, differential pressure, and several others. Each methodology exists in the market because it may perform better or cost less when meeting certain performance requirements. This article is focused on magnetic flowmeters and when they may be a good candidate for your project.
Here is a list of some of the positive attributes of magnetic flowmeters.
- Magnetic flowmeters have no moving parts, always a plus.
- General construction arrangement allows for use of an interior liner for corrosion resistance.
- With no sensor insertions into the fluid flow, the impact of the instrument on the flow is minimized.
- Accuracy, when compared to other technologies, is high.
- Application to laminar, turbulent, and transitional flow profiles is permissible.
- General insensitivity to fluid viscosity, specific gravity, temperature and pressure.
- Magnetic flowmeter technology can be applied to a very wide range of pipe sizes.
- Device responds rapidly to changes in fluid flow.
- Can be successfully applied to liquids containing heavy particulates.
- Generally long service life with little maintenance.
- Magnetic flowmeters only work on liquids with conductivity above a certain threshold. They may be unsuitable for use with hydrocarbons and high purity water for this reason.
- Cannot be used to measure gas flow.
- Pipe must be grounded.
- Typically, the pipe cross section must be filled by the fluid being measured.
Your Best Course of Action:
Use this general overview to start shaping you understanding of where magnetic flowmeters may be a good option, and contact a product application specialist to discuss what you want to accomplish. Combining your process knowledge with their product knowledge should move you toward a good solution.