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UFM610UFM610UFM610UFM610
WellcomeBienvenue
Willkommen Bienvenido
Добро пожаловать ようこそ
歡迎
The Transit Time Clamp-on Flow Metering Technique
Introduction
•Principle of operation.
•Modes of operation.
• Installation guidelines.
Principle of operation
•The general principle of time of flight flow measurement.
•The phase measurement system.
•Modes of operation
A B
Flow
Sensor Block
Liquid
Sensor Block
Vf = Flow velocityl = Distance between transducersCf = Path length between transducer
facest = Transit-time downstreamKn = Profile correction factor = Propagation angle
Approximate relationship between fluid velocity and measured time. Does not include clamp on transducer delays.
fnf ct
lKV
sin
1
The general principle of time of flight flow measurement.
Typical sound path for a clamp on ultrasonic meter
Steel
Transducers
Plastic
Line represents path of sound wave Water
Pipe cut through side view
The direct time measurement system
A B
Flow
Sensor Block
Liquid
Sensor Block
Pipe wall
A
Flow Liquid
Sensor Block
BSensor Block
Pipe wall
Reflex mounting• ease of setup • good results over a broad range of applications
Diagonal mounting• extends the readable pipe diameter for given sensors • better for high flows• better with turbulent applications
Modes of operation
A B
Flow
Sensor Block
Liquid
Sensor Block
Pipe wall
A B
Flow
Sensor Block
Liquid
Sensor Block
Pipe wall
Double reflex mounting• ease of setup• useful for smaller pipe diameters • good on low flow rates
Triple reflex mounting• ease of setup• useful for smaller pipe diameters • good on low flow rates
Modes of operation
Installation guidelines
•Transducer positioning.
• Flow profiles
Ultrasonic flow meter axial and radial sensor location
Summary
•Principle of operation.
•Modes of operation.
• Installation guidelines.