Non-Contacting Doppler Flow Meters - PowerPoint PPT Presentation

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Non-Contacting Doppler Flow Meters

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Introduction to Greyline Doppler Flow Meters and Switches. ... Bienvenue Willkommen Bienvenido – PowerPoint PPT presentation

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Title: Non-Contacting Doppler Flow Meters


1
Wellcome Bienvenue Willkommen Bienvenido ?????
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2
The Doppler Clamp-on and Open Channel Flow
Metering Technique
3
Introduction
  • Principle of operation.
  • Modes of operation.
  • Installation guidelines.

4
The general principle of Doppler flow
measurement.
 
Approximate relationship between fluid velocity
and measured time. Does not include clamp on
transducer delays.
v is the speed of waves in the medium
vs is the velocity of the source
5
Doppler Flow Measurement
  • Continuous frequency is transmitted

How it Works
  • Sound bounces off gas bubbles or particles in the
    fluid
  • Reflected sound returns at an altered frequency

6
Doppler Flow Technology
  • Doppler Transmit
  • Doppler Receive
  • Doppler Shift

7
Modes of operation
  • - Single head
  • Transmit and Receive Crystals in same Head
  • - Dual-Head
  • Transmit and Receive Crystals in separate Heads

8
Installation guidelines
  • Transducer positioning.
  • Flow profiles

9
Doppler Sensor Coupling
10
Doppler Sensor Mounting
Doppler Sensor Mounting
11
Doppler Sensor MountingAvoid Turbulent Flow
  • Locate the Doppler Sensor 6 to 10 pipe diameters
    from Pipe Elbows or Tees
  • Avoid highly Turbulent Flow locations

12
Doppler Sensor MountingAvoid Laminar Flow
  • Viscous or solids-bearing liquids develop a
    laminar profile
  • Take readings at several locations and mount
    Sensor where flow is evenly distributed

13
Doppler Sensor MountingAvoid Velocity-Increasing
Devices
PUMP
25 - 40 Pipe Diameters
  • Locate the Doppler Sensor 25 to 40 Pipe Diameters
    from Pumps, Controlling Valves, Orifice Plates,
    Pipe Discharges or any other Velocity-Increasing
    Devices

14
Doppler Sensor MountingAvoid 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

15
Summary
  • Principle of operation.
  • Modes of operation.
  • Installation guidelines.
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