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21st May 2014 SWIG – Manchester Rob Stevens, RS Hydro
LaserFlowTM
Overview
Challenges & Applications
Including Existing technologies
Existing Technologies
Pros/Cons
Ideal Solution
Results from The Field
Questions
Applications & Challenges
• MCERTS Discharges• WWTW Inlets/FFT/Process• Sewers/CSOs• Rivers/Streams/Culverts
• Challenges• High standards of installation is required • Minimise costs of installation & Whole of Life Costs• Minimise maintenance• Reduce H&S risks• Maximise uptime & reliability• High accuracy
• Flumes• Area Velocity• Radar• Electromagnetic/Ultrasonic
Existing Technologies
Tech
no
logi
es
Technology Pros Cons
Flumes (U/S or other)
AccuracyLow Maintenance
Cost/Flow Range-Sizing/Downtime
Area Velocity Flexible/PortableCost
AccuracyMaintenanceH&S
Radar Non-ContactCost
Accuracy (requiresprofiling)
Emag/Ultrasonic AccuracyCostU/S non-contact
Full PipeDowntime (Emag)
Pros/Cons
Tech
no
logi
esA familiar story…?Albeit a little extreme…
• FFT• Area Velocity Sensor Installed• Cleaned Daily
• Result after 5 days no cleaning• Required crane to remove• 1 tonne of ragging!
What would it be?• Non-contact?• Low maintenance• Minimal/Zero H&S risk• High Accuracy• Retro-Fit• Wide range of applications incl difficult…WWTW inlets• Others….???
Ideal Solution
LaserFlow Overview> Theory > Installation > Maintenance > Versions
Lase
rFlo
w
LaserFlow Sensor
Return DopplerSignal Light
Flowing Water Stream
V
Below Surface
The Theory
Lase
rFlo
w
Below the surface
5000 Spectral Velocity Readings
The Theory 2
Lase
rFlo
wUltrasonic Level Sensor
• Range 0-3M (0 – 10 feet)
• 45˚ Deflector Plate
• 10˚ Beam Angle
0-3M 0-10 ft
Lase
rFlo
w
• Virtual Zero Dead band
• Ultrasonic dead band is exceeded by the time the signal reaches the bottom of the LaserFlow.
12 “ dead band
Ultrasonic Level Sensor
Lase
rFlo
w
Ultrasonic Level Measurement
Laser Velocity Measurement
Single Point Velocity Method
Single Point Velocity Method
Lase
rFlo
wUltrasonic Level Measurement
Laser Velocity Measurement
Multi Point Velocity Method
Multi Point Velocity Method
Lase
rFlo
wUltrasonic Level Measurement
Laser Velocity Measurement
Multi Point – Multi Depth Velocity Method
Multi Point-Multi Depth Velocity Method
Lase
rFlo
wWhen do you use single point velocity
measurement?• Uniform and consistent flow• Battery Life is a concern• Rapid Data Rate – 1 minute
Lase
rFlo
wWhen do you use Multipoint velocity
measurement?• Non-Uniform Flow
• AC Power
• Longer Reading intervals
Lase
rFlo
wSubmerged Condition
• Measurement during Submerged condition– TIENetTM CW area velocity sensor
• Proven technology• Not a point velocity measurement• More accurate during surcharged conditions
• Measurement can start on different conditions– Variable Rate Data Storage
• Laser Level• Laser Velocity• Laser Temperature• CW Level• CW Velocity
• Laser cone design prevents water from reaching the laser window
Lase
rFlo
wNormal Operation
• Laser velocity
• Ultrasonic Level (USLS)
Lase
rFlo
wSubmerged Condition Begins
Lase
rFlo
wLaserFlow Fully Submerged
CWD sensor reading velocity
Pressure Sensor reading depth
Lase
rFlo
wRedundant Measurement
AreaVelocity(laser)
Level(USLS)
Level(pressure transducer)
AreaVelocity(sound wave)
TIENet Area Velocity sensor with a longer Cable 1,10, 23M
Lase
rFlo
w• Laser can be installed facing in the upstream or
downstream pipe.• Center the bracket over the flow stream.
Installation Requirements
Lase
rFlo
wPermanent Wall Mount
Street Level Installation Tool
Street level installation alignment tabs
Lase
rFlo
wLevel installation
Lase
rFlo
wInto/Away from the flow
Lase
rFlo
wOther Features
• Optical Clarity System to ensure reliable measurement in severe conditions.
• Remote Ultrasonic Option for applications that have > 3” offset in level and velocity measurement points.
• Low Velocity and Low Level Measurement Feature:
• Flow measurement down to a depth of 0.5” (12.5 mm).• Velocity measurement down to 0.5 ft/sec (0.15 m/s).
• Low Temperature operation down to -20 °C.• Adaptive Focus and Automatic Peak Detection Feature to
improve flow measurement in difficult hydraulic conditions. • Steep slope application suitability, smart polarity selections and
customization of bi-directional flow measurement.• Industry leading flow accuracy: +/- 4%.• Improved power management efficiency.
Results from the Field
Res
ult
sWWTW Inlets
• Installations 2-6 hours• No shutdown• Difficult Applications
Res
ult
sMCERTS Flume
Res
ult
sData