CHAPTER 1INTRODUCTION TO FLOW METERS
HOW TO SELECT A FLOW METER

【1】First, it is necessary to confirm the properties of detection fluids.

Fluid types	Gas, Liquid, Vapor, etc.
Density	Can be calculated from fluid name, temperature and pressure
Viscosity	Required for liquids
Electrical conductivity	Required for electromagnetic type flow meters
Contaminants	Air bubbles, mixed-in foreign objects, slurry, etc.
Flow range	Minimum and maximum flow
Fluid temperature	Measured in response to the fluid
Fluid pressure	For pressure-resistance confirmation
Pressure loss	Measured as necessary

【2】Next, clarify the purpose of measurement. At this point, determine a selectable detection system along with properties such as accuracy and flow range

【3】Once the detection method has been determined, make a decision while confirming detailed model specifications.

【4】Finally, compare costs. Because removing a flow meter also takes time, you must make a decision that not only considers the unit price of the product, but also considers maintenance time after installation as well as the cost of set-up or troubleshooting. Generally when the product unit price is low, frequent maintenance or failure replacement may be required.

COMPARISON OF EACH FLOW METER DETECTION METHOD [REPRESENTATIVE EXAMPLE]

	Electromagnetic type	Karman vortex type	Paddle wheel type	Floating element type
Liquid	Available	Available	Available	Available
Gas	N/A	Available	N/A	Available
Vapor	N/A	Available	N/A	Available
High temperature support	Available	Available	Available	Available
Micro flow	Conditional	N/A	Available	N/A
Medium flow	Available	Available	Conditional	Available
Large flow	Available	Available	Conditional	Available
Viscosity	Available	N/A	N/A	Conditional
Slurry	Available	Conditional	N/A	Conditional
Oil	N/A	N/A	Available	Available
Accuracy	Available	Available	Conditional	Conditional
Maintainability	Available	Available	N/A	N/A
Pressure loss	Available	Conditional	N/A	Conditional
Air bubbles	Conditional	Conditional	Conditional	Conditional

	Thermal type	Differential pressure type	Ultrasonic type	Coriolis type
Liquid	N/A	Available	Available	Available
Gas	Available	Available	Available	Conditional
Vapor	N/A	Available	Conditional	N/A
High temperature support	Available	Available	Available	Available
Micro flow	Available	Conditional	N/A	Available
Medium flow	Available	Available	Conditional	Available
Large flow	Available	Available	Available	Conditional
Viscosity	N/A	N/A	Available	Conditional
Slurry	N/A	Available	Available	Available
Oil	N/A	Available	Available	Available
Accuracy	Available	N/A	Available	Available
Maintainability	N/A	N/A	Available	Available
Pressure loss	N/A	N/A	Available	N/A
Air bubbles	N/A	N/A	N/A	Available

	Electromagnetic type	Karman vortex type
Liquid	Available	Available
Gas	N/A	Available
Vapor	N/A	Available
High temperature support	Available	Available
Micro flow	Conditional	N/A
Medium flow	Available	Available
Large flow	Available	Available
Viscosity	Available	N/A
Slurry	Available	Conditional
Oil	N/A	N/A
Accuracy	Available	Available
Maintainability	Available	Available
Pressure loss	Available	Conditional
Air bubbles	Conditional	Conditional

	Paddle wheel type	Floating element type
Liquid	Available	Available
Gas	N/A	Available
Vapor	N/A	Available
High temperature support	Available	Available
Micro flow	Available	N/A
Medium flow	Conditional	Available
Large flow	Conditional	Available
Viscosity	N/A	Conditional
Slurry	N/A	Conditional
Oil	Available	Available
Accuracy	Conditional	Conditional
Maintainability	N/A	N/A
Pressure loss	N/A	Conditional
Air bubbles	Conditional	Conditional

	Thermal type	Differential pressure type
Liquid	N/A	Available
Gas	Available	Available
Vapor	N/A	Available
High temperature support	Available	Available
Micro flow	Available	Conditional
Medium flow	Available	Available
Large flow	Available	Available
Viscosity	N/A	N/A
Slurry	N/A	Available
Oil	N/A	Available
Accuracy	Available	N/A
Maintainability	N/A	N/A
Pressure loss	N/A	N/A
Air bubbles	N/A	N/A

	Ultrasonic type	Coriolis type
Liquid	Available	Available
Gas	Available	Conditional
Vapor	Conditional	N/A
High temperature support	Available	Available
Micro flow	N/A	Available
Medium flow	Conditional	Available
Large flow	Available	Conditional
Viscosity	Available	Conditional
Slurry	Available	Available
Oil	Available	Available
Accuracy	Available	Available
Maintainability	Available	Available
Pressure loss	Available	N/A
Air bubbles	N/A	Available