How to select a flow meter -2
When
selecting a flow meter(Magnetic, Ultrasonic and Coriolis mass), follow
the steps below:www.rbflowmeters.com【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 |
Ultrasonic type
|
Coriolis type
|
Liquid
|
Available
|
Available
|
Available
|
Gas
|
N/A
|
Available
|
Conditional
|
Vapor
|
N/A
|
Conditional
|
N/A
|
High temperature support
|
Available
|
Available
|
Available
|
Micro flow
|
Conditional
|
N/A
|
Available
|
Medium flow
|
Available
|
Conditional
|
Available
|
Large flow
|
Available
|
Available
|
Conditional
|
Viscosity
|
Available
|
Available
|
Conditional
|
Slurry
|
Available
|
Available
|
Available
|
Oil
|
N/A
|
Available
|
Available
|
Accuracy
|
Available
|
Available
|
Available
|
Maintainability
|
Available
|
Available
|
Available
|
Pressure loss
|
Available
|
Available
|
N/A
|
Air bubbles
|
Conditional
|
N/A
|
Available
|
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