INTERNAL
Level Measurement - Water and Waste Water Industry
Level Measurement Technologies in the Water and Waste Water Industry
• Ultrasonic• Submersible Pressure• Guided Wave Radar• Free Space Radar• Capacitance• Vibration• Conductivity• Floats
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The Prosonic Family
Level Measurement - Water and Waste Water Industry
Value
Perfo
rman
ce
Prosonic TFMU30
Prosonic MFMU4x
Prosonic SFMU9x/FDU9x
Hopefully, it wasn’t a secret to you that E+H sells ultrasonic level
instruments!
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Secret #1 – The FMU30
Level Measurement - Water and Waste Water Industry
For on site operation
display
FieldCare (with service DTM)
Two versions: 1½”/2” with
16 ft. / 26 ft. in liquids
Certificates:Reliable software algorithms and software structure, electronic components Ex ia /IS
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Secret #2 – Dynamic Build Up Compensation
Level Measurement - Water and Waste Water Industry
• Unit monitors the amplitude of the signal at the transducer membrane
• When the amplitude is dampened, build up is detected
• Unit automatically adjusts power to the transducer face, continually ensuring the transducer face is free of build up
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Secret #3 – Decoupled Transducer Housing
Level Measurement - Water and Waste Water Industry
• Transducer housing is decoupled via an inner ring
• Eliminates false high levels due to ringing:• Caused by over tightening• Temperature effects of a metal coupling
Mechanical decoupling with an inner ring
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Secret #4 FDU90 Sensor – The Little Brother of the FDU9x Sensors
Level Measurement - Water and Waste Water Industry
-40°F /
176°F
(302°F)
-40°F/
203°F
-40°F /
203°F
-40°F / 221°F
(275°F)
-40°F /
176°F
-40°F / 176°FTemperature range
272315.711.811.82.7Blocking distance [in]
10 - 21
PSIA
10 - 58
PSIA
10 – 58 PSIAPressure
137493316164Max. measuring distance
(solids) [ft]
8265333310Max. measuring distance
(liquids) [ft]
FDU95FDU93FDU92FDU91FFDU91FDU90
10 - 58
PSIA
10 - 43
PSIA
10 - 58
PSIA
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Secret #5 Alternating Pump Control
Level Measurement - Water and Waste Water Industry
• Up to 6 pumps to program• Control possibilities:
1. By Limits (high or low)2. By pump rate (to reach a programmed pump rate in dependence of the inflow of a lift station) – “stand by function”
• Alternating function selectable• For each pump: Switch on delay, backlash function, crust
reduction and error handling programmable
Lift Station
ChannelNetwork
M
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Pump Control by Pump Rate
Level Measurement - Water and Waste Water Industry
Level
t min
Inflow 1
Target emptying rate
Pump 1+2+3 on
Pump 1 on
Pump 1+2 on
Switch on
Switch off
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Secret #6 Crust Reduction
Level Measurement - Water and Waste Water Industry
To reduce crust building at the walls of a pump shaft a variable switch point (e.g. +/- 2%) for pumps is programmable.
Why ? Crust at the wall can cause wrong readings and the customer has to clean it, using crust reduction reduce
maintenance time.
Switch on
Switch off
Level
t
+/- 2%
+/- 2%
Switch on
Switch off
+/- 2%
+/- 2%
INTERNAL
Level Measurement - Water and Waste Water Industry
Secret #7 Sludge Detection
Sludge detection:
• Ratio between Ld/Lu will be detected. For Ld/Lu smaller a programmed value the relay will set an alarm.e.g. Ld/Lu should be bigger than 0,6
Level upstream Lu Level downstream Ld
Ratio =0,80,70,60,5
e.g. Sludge detection in flumes
INTERNAL
Level Measurement - Water and Waste Water Industry
Secret #8 Backwater Detection
• The ratio of the downstream depth to the upstream depth is expressed as a percentage and referred to as the submergence ratio.
• Calibration tests show that the discharge of a flume is reduced once the submergence ratio exceeds certain specified ratios.
• Once the submergence ratio exceeds these values, the flume is operating under submerged conditions and the flow rate is adjusted according to submerged discharge tables/formulas.
• As the ratio increases, the flow rate decreases. At a ratio of 1.0, the flow rate will be 0.
Ratio = 0.8
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Secret #9 Measuring Level and Flow in Storm Water BasinLevel Measurement - Water and Waste Water Industry
Level
4 ... 20 mA
Over
flow
4 ... 20 mA
Storm water basin
to river
Level
Over
flow
Easy to order:
Customer chooses via structure:
- 1 x sensor FDU 9x
- 2 x 4 ... 20 mA
- Application: Flow + Level
Benefit:
Only one sensor to measure two
parameters
lower cost
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Sewer system monitoring
Level - Continuous Liquids - Ultrasonic
overflowbarrier
• Control the filling level if the channel is used as storm water basin
• Calculate amount of raw sewage that is discharged into the river
• Channel blockage monitoring
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Flow measurement in open channels and weirs
• Records volume water flowing into treatment plant.
• The relationship between level and flow in a wastewater channel is represented in a Q/h curve
• Many channel and weir configurations are stored in Prosonic S
• Other channels can be programmed via a 32-point chart or via parameters.
Level - Continuous Liquids - Ultrasonic
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Inlet control: Rake/screening control for cleaning
• Measurement of differential level before and after the rake/screen with Prosonic S and 2 x FDU 90/91 sensors.
Slide 18
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Level Measurement - Water and Waste Water Industry
Water and Waste Water Industry
What applications in Water and Wastewater would we look at
technologies other than Ultrasonic Level Transmitters?
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Lift Stations
Level Measurement - Water and Waste Water Industry
FMX21
Submersible Pressure
Process Indicator with Pump Control
RIA452
INTERNAL
Level Measurement - Water and Waste Water Industry
Bulk Hydrochloric Acid Storage Tank
• Replaced an Ultrasonic Transmitter• Problems
• Fumes • Center Mount – re-focused
acoustic energy
• Free Space Radar• FMR51 Success
• Not affected by vapors• Fiberglass tank does not reflect
Microwaves
INTERNAL
Level Measurement - Water and Waste Water Industry
Sludge Digester Level
• Ultrasonic Transmitter Failed• Problems
• Irregular surface - foam• Warm environment -
Condensation • Methane and Carbon Dioxide
Fumes
• Free Space Radar• FMR54 Success
• Not affected by vapors• 6GHz less affected by
condensation and foam
INTERNAL
Level Measurement - Water and Waste Water Industry
Sewage Wet Well
• Ultrasonic Transmitter Failed• Problems
• Warm environment -Condensation
• Hydrogen Sulfide Vapors
• Free Space Radar• FMR50 Success
• Not affected by vapors• TFE Antenna design sheds
condensation
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Level Measurement - Water and Waste Water Industry
Chemical Storage in Plastic Tanks
• Plastic vessels are often used for aggressive / corrosive liquids
• The Levelflex Guided Wave Radar can be mounted on the outside of a plastic vessel
• Microwave energy penetrates through the plastic wall and reflects off the surface of the liquid providing a non-contact measurement
INTERNAL
Level Measurement - Water and Waste Water Industry
Scum Pit
• Ultrasonic Transmitter Failed• Problems
• Foam • Irregular surface
• Free Space Radar• FMR54 Success
• 6GHz better with foam• Larger beam angle helps
with irregular surface
INTERNAL
Level Measurement - Water and Waste Water Industry
Point Level Pump Protection
• Liquiphant mounted in the suction side piping for progressive cavity pumps
• When the Liquiphant indicates the line is empty, shut down pump to prevent “Run Dry” damage