Magnetic Flowmeters are based on Faraday's Law of Magnetic Induction. 

According to Faraday's Law, 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. 

Huh?...  
In a magnetic flowmeter, 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 takes the voltage and calculates the flow rate based on the cross sectional area of the meter tube.

Construction/Design Principle:
The magnetic flowmeter consists of a flowtube, 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. 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. 

Typical Applications:

Water	Process chemicals	Sewage
Liquid food products	Sludge	Paper pulp
Detergents	Corrosive acids	Electrolytes
Mining Slurries	Brine	Industrial effluents

Our Favorite Application:

FM657 TigermagEP

Twice a week a hot sauce manufacturer receives a 10,000 gallon truckload of chili peppers suspended in water. They needed a method to verify the truck scale tickets as well as improve inventory records. Problem: The truck scales would be very expensive and most flowmeters would have problems measuring the pepper slurry.     >>>  The Sparling Solution... <<<

	Waterhawk,		Insertion Style Mag Meters TYPE 3110
	Tigermag,
	TigermagEP