non-contact area velocity
TRANSCRIPT
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Non-Contact Area Velocity Discuss basic open channel flow measurement
Discuss traditional area velocity flow measurement techniques and technologies
Discuss the latest in Non-Contact Area Velocity flow measurement techniques and technologies
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Primary Devices
Flumes
Weirs
Level – Flow Conversion
Flow Meters
Bubblers
Ultrasonic
Pressure Sensors
Traditional Open Channel Flow Measurement
Techniques
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Flumes - Advantages 5% Accuracy
Traceable
Open Channel Flow
Handbook
Simple level measurement
Accepted measurement
practice
The “standard”
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Flumes - Disadvantages Expensive
Primary Device cost
Installation
Impractical
No place to install
Head loss
Debris
Site conditions change
Flow exceeds initial design requirements
Flume designed to handle future flows
Operating in inaccurate flow range
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Weirs - Advantages
Simple
Construction
Easy to install
Primary Device cost
Requires level measurement
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Weirs - Disadvantages Expensive
Construction/Installation
Primary Device cost
Stainless Steel
Plywood
Head loss
Debris
Submerged Flow Conditions
Need proper hydraulics
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Flow
Measurement
Laboratory
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The right product for the application
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Traditional Doppler Velocity Measurement Q = A x V
A = Pressure
V = Doppler
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C
C
B
B
A
A
CROSS SECTION A-A CROSS SECTION B-B CROSS SECTION C-C
Doppler Velocity Measurement Profile
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Return Spectrum
24" Pipe 0.25% 1780 gpm 8" 4.507 ft/s
2150 201K01367 v1.12 Probe 203F00288
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
-400 -200 0 200 400 600 800 1000
Frequency
Sig
nal S
trength
CWD Velocity
Measurement
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The Doppler Effect Transmitter and receiver moving toward each
other
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The Doppler Effect Transmitter and receiver moving away from
each other
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Advanced diagnostics provided early warning of
debris issues
Graphical Diagnostics
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Velocity Profiling
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Historically the only method for flow measurement without a primary device
Manning Formula
Level only measurement
Bubbler
Ultrasonic
Pressure
Area Velocity
More accurate
Surcharge capabilities
Doppler Area Velocity Sensors
Improved reliability
Data quality unknown
Small pipes
Sensor caused obstruction in flow
Debris, hydraulic issues
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Contact AV Sensors
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Why use a non-contact flow sensor?
Safety
Maintenance
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Market Need
Need non-contact area velocity measurement
Needed more accurate non-contact system than basic
ultrasonic
Manning Formula
Accuracy +/- 20% or worse
Could not handle surcharge or submerged conditions
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Contact vs Non-Contact…Why? Safety
Cannot get flushed down a sewer pipe if you are not in the sewer.
Confined Space Entry
Permits
Traffic Control
Manpower
Large Pipe
Difficult Installations
Flow Depths greater than 3 ft
Velocity over 3ft/second
Maintenance issues
Silting, debris
Small pipes – <24” Low level flow measurement
Shallow water depths with high velocities
Dollars$$$$$
$500 per site visit
1 per month
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Non-Contact Radar Surface Velocity
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Uses radar to read surface velocity.
Surface Velocity is then adjusted to
estimate average velocity
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Smooth surface
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Surface Ripple
from Wind
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Electromagnetic Point Velocity Sensor
Submerged Flow Operation
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Non-Contact Radar Velocity Flow Systems Non-contact Surface Velocity Measurement Non-contact Ultrasonic Level Measurement Advantages
More accurate than level only devices Above water installation Minimal maintenance Reads extremely clean water
Disadvantages Needs velocity high enough to generate surface waves Dead band in ultrasonic level measurement Surcharge sensor reads point velocity Requires velocity profiling
May not be practical with widely fluctuating flows Storm events
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Deadband
Normal Operation — Lower Flows
Non-contact Ultrasonic Surface Velocity
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Confined Space Entry Required
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Normal Operation — Submerged Flow
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Non-Contact Ultrasonic Surface Velocity Non-contact Surface Velocity Measurement
Non-contact Ultrasonic Level Measurement
Advantages More accurate than level only devices
Measures level and velocity in same location
Disadvantages Confined space entry required for both installation and
maintenance.
Requires velocity profiling Needs velocity high enough to generate surface waves
May not be practical with widely fluctuating flows
Storm events
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Non-Contact Laser Subsurface Velocity
Non Contact Area Velocity Flow Measurement System
Level Measurement Ultrasonic
Velocity measurement Laser
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Theory of operation
34
LaserFlow Sensor
Return Doppler Signal Light
Flowing Water Stream
V
Below Surface
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Theory of Operation Below the surface
5000 Spectral Velocity Readings
Point of Convergence
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Ultrasonic Level Measurement
Laser Velocity Measurement
Multipoint -Multidepth
Velocity Method
Multipoint – Multidepth Velocity Method
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Normal Operation Ultrasonic
Level (USLS)
Laser velocity
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Submerged Condition Begins
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LaserFlow Fully Submerged
CWD sensor reading velocity
Pressure Sensor reading depth
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Non-contact Laser Sub-surface Velocity
Non-contact Sub-surface Velocity Measurement
Non-contact Ultrasonic Level Measurement
Advantages More accurate than level only devices
Reads below the surface velocity using laser
No profiling required under normal flow conditions
Disadvantages
Extreme velocity changes could requires velocity profiling
Steam or heavy foam may not work
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Permanent Wall Mount
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Temporary Mount
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Street Level Tool
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Street Level
Installation Tool
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Sensor Mounted
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Repeatable Data
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Ultrasonic Signal Strength
Returned Laser Signal Power
Diagnostic Data
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Non-Contact Applications Collection System Monitoring
Permanent AC powered Billing
Portable DC powered Inflow and Infiltration
WWTP Influent and effluent In plant pipes and channels
Hydraulic Modeling Accuracy
Industrial monitoring Harsh Chemicals / Environments
Storm water Large debris
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Harsh Chemical Environment
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Storm sewer
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Submerged flume condition
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Submerged flume condition Bubbler
Ultrasonic
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“Not” Non-Contact Applications Non uniform hydraulics
Weir walls
Heavy Foam
Major temperature swing environments
See only surface or limited below the surface
Severe bends in manhole
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Dynamic IP
FL Client FL Client
FL Client FL Client
Off-site User
Off-site User
Remote Sites
Firewall
Static IP
Windows Server • Server Software
• IP Listener
• Web UI
• Alarm Server
• Enterprise Database
• MS SQL or Oracle
Organization Network
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Dynamic IP
FL Client FL Client
FL Client FL Client
Off-site User
Off-site User
Remote Sites
Firewall
Static IP
Windows Server • Server Software
• IP Listener
• Web UI
• Alarm Server
• Enterprise Database
• MS SQL or Oracle
Organization Network
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Dynamic IP
FL Client FL Client
FL Client FL Client
Off-site User
Off-site User
Remote Sites
Firewall
Static IP
Windows Server • Server Software
• IP Listener
• Alarm Server
• Web UI
• Enterprise Database
• MS SQL or Oracle
Organization Network
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Dynamic IP
FL Client FL Client
FL Client FL Client
Off-site User
Network Connection
(e.g. VPN)
Off-site User
Remote Sites
Firewall
Static IP
Windows Server • Server Software
• IP Listener
• Alarm Server
• Web UI
• Enterprise Database
• MS SQL or Oracle
Organization Network
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Dynamic IP
FL Client FL Client
FL Client FL Client
Off-site User
Remote Sites
Firewall
Static IP
Windows Server • Server Software
• IP Listener
• Alarm Server
• Web UI
• Enterprise Database
• MS SQL or Oracle
Organization Network Off-site User
via Web Browser
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Whip Style
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Manhole Antenna
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Blade Antenna
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Summary
Non-Contact Area Velocity More accurate than traditional non-contact level
only devices
Precise and accurate
Reasonably priced
Easy to install and maintain
Safety for personnel
Minimal maintenance
Flexible Platform Multi-sensor design
Internet access to data
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Questions?