Piping techniques for flowmeters
April 10, 2017

How to select suitable flowmeter

dianci40
Vortex Flowmeter
Rotameter(for water)
Flange Type
When selecting a flow meter, follow the steps below:
【1】Confirm the properties of the detection fluid
【2】Confirm the purpose of measurement and determine the detection method
【3】Confirm product specifications
【4】Consider cost

【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.
OMPARISON OF EACH FLOW METER DETECTION METHOD [REPRESENTATIVE EXAMPLE]
 
Media Electromagnetic type Karman vortex Paddle wheel Floating element Thermal type Diaphragm type Ultrasonic type Coriolis type
Liquid Available Available Available Available N/A Available Available Available
Gas N/A Available N/A Available Available Available Available Conditional
Vapor N/A Available N/A Available N/A Available Conditional N/A
High temperature support Available Available Available Available Available Available Available Available
Micro flow Conditional N/A Available N/A Available Conditional N/A Available
Medium flow Available Available Conditional Available Available Available Conditional Available
Large flow Available Available Conditional Available Available Available Available Conditional
Viscosity Available N/A N/A Conditional N/A N/A Available Conditional
Slurry Available Conditional N/A Conditional N/A Available Available Available
Oil N/A N/A Available Available N/A Available Available Available
Accuracy Available Available Conditional Conditional Available N/A Available Available
Maintainability Available Available N/A N/A N/A N/A Available Available
Pressure loss Available Conditional N/A Conditional N/A N/A Available N/A
Air bubbles Conditional Conditional Conditional Conditional N/A N/A N/A Available