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Objectives Velocity and flow measurement

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Wellcome Bienvenue Willkommen Bienvenido Добро пожаловать ようこそ歡迎

The Doppler Clamp-on and Open Channel Flow Metering Technique

Introduction Principle of operation. Modes of operation. Installation guidelines.

v =is the speed of waves in the medium v s =is the velocity of the source Approximate relationship between fluid velocity and measured time. Does not include clamp on transducer delays. The general principle of Doppler flow measurement.

Doppler Flow Measurement Continuous frequency is transmitted Sound bounces off gas bubbles or particles in the fluid Reflected sound returns at an altered frequency How it Works:

Doppler Flow Technology Doppler Transmit Doppler Receive Doppler Shift

Modes of operation - Single head  Transmit and Receive Crystals in same Head - Dual-Head  Transmit and Receive Crystals in separate Heads

Installation guidelines Transducer positioning. Flow profiles

COUPLING COMPOUND Doppler Sensor Coupling PIPE SENSOR COMPOUND CLAMP RUBBER PAD

Doppler Sensor Mounting

Doppler Sensor Mounting Avoid Turbulent Flow Locate the Doppler Sensor 6 to 10 pipe diameters from Pipe Elbows or Tees Avoid highly Turbulent Flow locations

Doppler Sensor Mounting Avoid Laminar Flow Viscous or solids-bearing liquids develop a laminar profile Take readings at several locations and mount Sensor where flow is evenly distributed

Doppler Sensor Mounting Avoid Velocity-Increasing Devices Locate the Doppler Sensor 25 to 40 Pipe Diameters from Pumps, Controlling Valves, Orifice Plates, Pipe Discharges or any other Velocity-Increasing Devices Pipe Diameters PUMP

Doppler Sensor Mounting Avoid Flow in Branch Lines Doppler ultrasonic signals can travel long distances in clean, non-aerated liquids Mount the Doppler Sensor 25 to 50 diameters from branch lines with flow

Summary Principle of operation. Modes of operation. Installation guidelines.