Level Measurement Water and Wastewater Industry Measurement Water and Wastewater Industry. ... Level Measurement ... • Fiberglass tank does not reflect Microwaves.

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Level Measurement Water and Wastewater Industry

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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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E+H Ultrasonic Level Instruments

The best kept secrets exposed

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The Prosonic Family


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


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


• 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


• 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


-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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FDU90 Customer Benefits


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Secret #5 Alternating Pump Control


• 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

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


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%

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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

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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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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


FMX21

Submersible Pressure

Process Indicator with Pump Control

RIA452

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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

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Sludge Digester Level

• Ultrasonic Transmitter Failed• Problems

• Irregular surface - foam• Warm environment -

Condensation • Methane and Carbon Dioxide

Fumes


• Not affected by vapors• 6GHz less affected by

condensation and foam

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Sewage Wet Well


• Warm environment -Condensation

• Hydrogen Sulfide Vapors


• Not affected by vapors• TFE Antenna design sheds

condensation

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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

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Scum Pit


• Foam • Irregular surface


• 6GHz better with foam• Larger beam angle helps

with irregular surface

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Overfill Protection - Liquiphant


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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


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Thanks for Your AttentionQuestions?

Level Measurement Water and Wastewater Industry Measurement Water and Wastewater Industry. ... Level Measurement ... • Fiberglass tank does not reflect Microwaves.

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