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

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.

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 Diaphragm 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 Diaphragm 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

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