Magnetic Flow Meters

Magnetic Flow Meters are based on Faraday's Law of Magnetic Induction which states that the flow of a conductive liquid through the magnetic field will cause a voltage signal to be sensed by electrodes located on the flow tube walls. When the fluid moves faster, more voltage is generated. Faraday's Law states that the voltage generated is proportional to the movement of the flowing liquid. 

Learn More....

Step 1 - Review the 4 categories of Magnetic Flow Meters offered below and click the one that's best suited for your specific application:
FM656 Flanged Mag TigerMag Electronics Sizes: 1/2" to 16"	FM626 Wafer Mag TigerMag Electronics 1/10" to 4"	FM618 EconoMag Low Price/High Value 1/2" to 4"

Huh?...  
In a magnetic flow meter, the liquid acts as a conductor as it flows through the pipe. This induces a voltage which is proportional to the average flow velocity - the faster the flow rate, the higher the voltage. This voltage is picked up by sensing electrodes mounted in the meter tube and sent to the transmitter which uses the voltage to determine fluid velocity and then calculates the flow rate based on the cross sectional area of the meter tube.

Construction/Design Principle:
The magnetic flow meter consists of a flow-tube, which is a non-magnetic pipe lined with an insulating material. Embedded within the flowtube are a pair of magnetic coils, positioned 180' from each other. Positioned 90' to the center line of the magnetic field are a pair of electrodes which penetrate the pipe and its lining.  An integral or remotely mounted signal converter amplifies the signal and converts it into a standard analog signal (4 to 20 mA) and/or pulse output representing a predetermined volumetric unit. 

Advantages:  

	Obstructionless flow		Good accuracy (0.5 to 1%)
	Little or no pressure drop		Responds well to fast changing flows
	Insensitivity to viscosity, specific gravity, temperature and pressure  (under most circumstances)		Will work with laminar, turbulent, and transitional flows
	No moving parts		Handle slurries and heavy particulates
	Variety of available lining materials for use with harsh, chemically corrosive and abrasive fluids		Inline and insertion designs available to handle pipe sizes from approximately 1/10" to 96"
	Available in a wide variety of communication protocols

Disadvantages:  

The main disadvantage of the magmeter is that the fluids to measured must be conductive. Therefore, liquids such as hydrocarbons, petroleum products, crude oil, vegetable/animal fats and de-ionized water are not viable applications.