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OT T flow measurementMobile measurement systems

OTT measurement systems_ Reliable measurement technology

_ Well-thought-out solutions

_ Proven procedures

_ Precise data


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1881 19931925 1973 1974 1991 2006 20072012

1873

Mobile flow measurementThe mobile flow measurement counts as one of the oldest routinework relating to waterways.Since the invention of the mechanical meter in 1790, flows havebeen determined according to the traditional verticals procedure.

This procedure is an indirect measuremen t procedure, where boththe average flow velocity atspecified verticals is recorded as wellas the flow cross-section.Using the measurement values, at the end of a measurement theflow can be calculated using a mathematical model.

Verticals procedureThe verticals procedure, an in ternationally recognized stan dard,

is comprehensively documented in various rules and standardssuch as in the ISO standard 748.In practice, with this method current meters are used that enablethe measurement of the flow velocity at individual points or therecording of a complete velocity profile at the verticals.

All OTT current meters are conceived for flow measurement usingthe classic verticals procedure. From the smallest meter to asophisticated measurement system reliable data and the appro-priate application in practice are in the foreground at OTT.

OTT single-drum winchesMobile measurement with suspended meters

With flow measurements with suspended meters, the measure-ment equipment hangs on a steel cable and is brought into therelevant measuring position using an electrical or mechanicalwinch.

If the measurement cross-section is in the area of a bridge, or ifa survey vessel is available, mobile measurement is possible. Forthis, the suspended meter is brought into position at the requiredmeasurement point using a single-drum winch with a fixedmounting on a boom.

Compact, reliable and easy to operate

OTT offers both mechanical and electrical single-drum winchesthat are designed for loads between 25 and 100 kg. The winchesare light and safe to operate. They ensure secure holding of thesuspended meter and are protected against overload, so thateven if the meter is caught by flotsam, for example, it does notrepresent a problem. The lowering depth can be comfortably readfrom the built-in depth counter.

QuantitativeHydrology Flexible drive possibilities

Mechanical winches can be easily upgraded to electrical drive.Electrical winches can be used even if there is a power failure, as

they can easily be changed to manual operation.

Cable way on request

For stations without a bridge or survey vessel, on request we alsooffer a stationary cable way that is TV tested and fulfills all safetyrequirements. To move the suspended meter horizontally and verti-cally, our cable ways are equipped in each case with a double-drumwinch, which can be driven mechanically or electrically and has adistance or depth counter.

Mobile flow measurementContinued

developmentOTT meters

First meterproduction

OTT calibration tank(max. 10 m/sec)

OTT measurement

channel(max. 3.5 m/sec) OTT C31 OTT C2

Universal

suspendedmeter

OTT Nautilus

(magneticinductive sensor)

Acoustic/

magn. inductivecurrent meters

OTT companyfounding

around 1890

Characteristics / Advantages

_ Compact, functional design_ Safety clutch_ Optimized cable guide_ Secure holding of the loadwith the automatic mechanicalbrake or spring-applied brake_ Flexible drive type_ For mobile suspended metermeasurements

Bridge boom withOTT single-drum winch


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Characteristics/Advantages

OTT C2_ Exact measurement of theflow velocity from as low as0.025 m/s

_ For the most shallow waterfrom 4 cm

_ Robust and indestructible_ Compact and easy totransport

Tradition for over a hundred years

The classic among the curren t meters is the OTT meter. Proventhousands of times, it is in operation worldwide as the standardmeasurement device.

With OTT meters, the point flow velocity is determined using thenumber of propeller rotations at a measure point. Careful and indi-vidual calibration of the devices in our calibration tank in Kemptenguarantees long-term, reliable measurement results.

Even under extreme conditions, OTT meters deliver exactly whatthey promise high-quality materials and the extremely robustconstruction make sure of it.

Exact calibrationin our in-house calibration tank

Digital signal counter setOTT Z400

Technical Data

OTT C2 OTT C31

propeller (mm) 30; 50; 80; 100; 125Propeller pitch (m) 0.05; 0.10; 0.125; 0.25;

0.25; 0.50 0.50; 1.00

Propeller material aluminum aluminum;plastic

v min. (m/s)* 0.025; 0.030; 0.035; 0.025; 0.030; 0.035;0.050; 0.055; 0.060 0.040; 0.055; 0.060;

v max. (m/s)* 1.0; 2.0; 4.0; 5.0 2.5; 3.0; 5.0; 6.0; 10.0

*The velocity measurement ranges are dependent on the diameter and pitch of thepropeller used


OTT C31_ Exact measurement of theflow velocity_ Wide range of applicationsfrom 0.25 m/s to 10 m/s_ Robust and indestructible_ Can also be used for checkingcurrent and flow meters_ Can be used universally asrod-mounted or suspendedmeter

OTT C2

With its small dimensions, the OTT C2 has its niche in veryshallow waters from 4 cm, for example in:

_ streams and small runoff ditches_ small channels_ pipes_ laboratories_ river models

Compact, handy and easy to transport, it is also often used atstations that are difficult to reach.

OTT C31The OTT C31 can be used both in small flowing wa terwayswith low depths and in deeper waterways with higher veloci-ties. Depending on the application, the meter can be used ona measuring rod or, mounted on a weight, as a suspendedmeter.

Classic flow measurement with proven meters

QuantitativeHydrologySignal counter set OTT Z400

A modern, digital, signal counter for registering the propellerrotations (impulses) is available with the OTT Z400.

Using a connection wire, the meter is simply attached to thesignal counter. The simple membrane keyboard allows thelargest hands to use it reliably.

The device can save meter equations internally and displayboth the number of impulses counted and the flow velocityitself.

OT TC2 and C31


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_ Can be used with conven-tional measuring rods_ Familiar measurement process_ Step-by-step user guidance_ Correct immersion depth canbe read on display_Automatic flow calculation inaccordance with internationalstandards_ High measurement accuracy_ Can be used in a variety ofsituations such as rivers,streams, canals, dams

Contemporary rod measurement in the proven way

The OTT ADC (Acoustic Digital Current meter) measures pointvelocities in open channels using acoustic signals. Highlydeveloped procedure for signal evaluation guarantees preciseand reliable measurement results.

Similar to a meter, the OTT ADC can be used on conventionalmeasuring rods. It does not only measure the flow velocity atthe measuring point, but is also equipped to measure the depth:

A pressure cell integrated in the sensor automatically determinesthe water depth at the vertical and the immersion depth of thedevice.

Step-by-step user guidanceThe display on the handy handheld unit he lps the user to positionthe sensor exactly. The other data are also easy to read on thedisplay. The software for the handheld unit leads the user fromedge to edge, step by step, and at the end of each measurementcalculates the flow.

Technical Data (1)

Velocity measurement:

Measuring range - 0.2 m/s 2.4 m/sAccuracy 1% of the measured value 0.25 cm/s

Acoustic frequencyUltrasonic transducers 6 MHz

Minimum water depth 4 cm

Methods fordischarge calculation Mid section methodEN ISO 748 Mean section method

Technical data (2)

Operating temperature -20 C +60 CSupply voltage 9.6 V DC (permanently

installed battery)Life typically 14 hours

Depth measurement (piezoresistive absolute pressure cell)

Measuring range 0 5 mResolution 0.01 % FS

Accuracy 0.1 % FS

Precise measurement valuesand data always available

Sophisticated measurement process

The ultrasound transducers of th e OTT ADC transmit signalsat short intervals. These are reflected by, for example, floatingmaterial in the water and return as an echo. Using mathematicalmethods, the OTT ADC checks two sequential echos for similarityand determines their time shift. This is then used to calculate theflow velocity. The most modern technology, intelligent evaluationalgorithms and integral quality checks guarantee a high accuracyof the measured values that remains stable in the long term.

Automatic reporting

Laborious reporting of measurement data is unnecessary with

the OTT ADC. All measurement values and the calculated partialand total flows are saved in the handheld unit and can be simplycalled from there. For further use, the user can transfer the datato a PC using the OTT Qreview processing software and processit there.

Handy handheld unit fromOTT ADC

Easily read displaywith important dataon the measurement

QuantitativeHydrology

OT TADCUltrasound technology for the traditional rod measurement


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QuantitativeHydrologyTechnical data (1)

Velocity measurement:

Measuring range 0 m/s 6 m/sAccuracy 0 3 m/s 2 % of the measured value 0.015 m/sAccuracy 3 5 m/s 4 % of the measured value 0.015 m/s

Minimum water depth 3.18 cm

Methods fordischarge calculation Mid section methodEN ISO 748 Mean section method

Technical data (2)

Operating temperature 20 C +60 C

Supply voltage Lithium-ion batteryLife typically 18 hours

Depth measurement (optional):

Sensor Absolute pressure sensor withsingle point calibration

Measuring range 0 3.05 mAccuracy* the larger of 2% of the measured

value or 0.015 m

*Steady state temperature and static non-flowing water


_ Compact, requires lowmaintenance_ Usual measurement process_ Intuitive user guidance_ Reduced time

_ Optional: Automatic water levelmeasurement_ Flow calculation according tointernational standards_Also for weed-infestedsections_ With turbulent flow conditions_ In dirty waters

Rod measurement using magnetic-inductive sensor

The OTT MF pro unit is an easy-to-use magnetic -inductivecurrent meter that requires nearly no maintenance and isdesigned to cost-efficiently measure point velocities in openchannels and canals.

The compact and rugged sensor is a ttached to the measuringrod. The measuring procedure is similar to that of the OTT ADCunit, however, a magnetic-inductive sensor is used with the OTTMF pro unit. Its compact design allows measurements to beperformed even in very shallow water.

Faraday measuring method

A magnetic coil incorporated in the sensor head creates amagnetic field. When water is passing the sensor head thewater ions create a voltage that relates to the flow velocity. It isobtained by means of two electrodes and then amplified. A smartmicroprocessor processes the signals and sends the results tothe handheld unit.

Reliable data within shortestperiod of time

Field operations made more easy

Operating the OTT MF pro can easily be learned based on thedefinite instructions provided on the display of the handheldunit. No manual logging required, since all data is automati-cally stored. This saves time and prevents copying errors.

The stored data may easily be transfer red to a PC via theUSB interface.

The point velocities measured and the flow th at is automati-cally calculated are visualized in real time which allows trendsto be recognized immediately. And thanks to the transflectivecolor display, information and instructions can be read even insunlight.

Extended application

Because of the measuring method, the OTT MF pro unitprovides reliable results, also with low flow velocities. Even inturbulent flow conditions or high suspended matter content,the unit provides dependable data and may be used both inweed-infested and dirty waters.

Versatile magnetic-inductive sensorOT T MF pro

Field-proven handheld unit of theOTT MF pro

Compactand rugged sensor


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OT TQliner2


_ Exact measurement data_ Robust design_Automatic flow calculation_ Safety when measuring noneed to enter the water

_ For waterway depths up to20 m and flow velocities upto 10 m/s_ No problems with drift andmoving bed

Made for hydrologists

The OTT Qliner 2 is a mobile flow measurement system thatmeets all the demands of the real world. It consists of an ultra-sound Doppler current sensor, a robust glass-fiber boat as devicecarrier, a Bluetooth data transfer unit and a waterproof PDA(Personal Digital Assistant).

Corresponding to the verticals procedure, at defined verticals ofthe flow cross-section the OTT Qliner 2 measures the water depthand the vertical velocity distribution precisely and reliably.Using the measurement data, it then calculates the average flowvelocity at the verticals, the partial flow of individual flow segmentsand then the total flow. In this it uses the mid-section method, aninternational standard.

Convenient remote controlfrom the bridge

Waterproof and robusthandheld unit (PDA) of the

OTT Qliner 2

Technical data (1)

Velocity measurement

Measuring range 10 m/sAccuracy 1% of the measured value 0.5 cm/s

Transducer frequency 1 MHz 2 MHzMax. range(water depth) 20 m 10 m

Minimum water depth 1.20 m 0.35 m

Simple process according toknown measuring method

Measurement process

Important parameters on the measurement cross-section andprocess are entered into the operating software of the PDA bythe user.

For the actual flow measurement, the boat is positioned at thevertical to be measured using cable guides. The boat remainsstable and secure in the flow even at high speeds and even withmoving bed the Qliner 2 provides reliable measurement values.

Wireless communication

Generally, the PDA and the electronics of the OTT Qliner 2 com-municate wirelessly via Bluetooth. In this way, all measured data

are transmitted in real time to the PDA to be processed there.Onerous reporting is no longer necessary.

After completing the measurement, the user can transfer th edata to a PC and process it further there using the OTT Qreviewsoftware.

Mobile flow measurement system with Doppler technology

QuantitativeHydrology Technical data (2)

Operating temperature -10 +60 C

Supply voltage 12 V DC (rechargeable battery pack)Life typically 1 day use in the field

Pocket PC (PDA) Type Nomad (Timber Tec)

Radio connection Frequency 2.4 GHz Type Bluetooth class 1 Range up to 150 m

(depending on environmental conditions)


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OT TQreview


_Validation of flow measure-ment data

_ Clear representation of themeasurement cross-sectionand the different valuesmeasured_ Convenient processing_ Simple data export to XML orTXT format_ Specially conceived fordata from OTT ADC andOTT Qliner 2

Evaluation software included

Flow measurements that have been carried out with the OTT ADCor the OTT Qliner 2 are saved on the handheld unit/PDA as a file.

The user can transfer these files to a PC and import them into theOTT Qreview software.

The comprehensive functions of OTT Qrevi ew make it possible tovalidate the data and offer convenient routines for further process-ing. An export to external databases can also be done with a fewsteps with OTT Qreview.

The processing software OTT Qreview is included with the OTTADC or OTT Qliner 2.

Powerful and at thesame time completely

uncomplicated

Useful functions

You can confidently save yourself laborious evalua tion of flowdata with OTT it is dealt with by the software. With clearmenu functions you only need a few clicks to get to where youare going. The numerous functions include:

; Visualization of the measurement cross-section with themeasured velocities in each case

; Visualization of individual ver ticals; Production of a measurement report with overview of

results and details of verticals; Post processing and correction of OTT ADC and

OTT Qliner 2 measurements

; Editing of measurement settings and recalculation offlow; Changing the flow calculation method; Export of the measurement to TXT or XML format,

e.g. for transferring to BIBER software and Software Q; Export of the cross-section coordinates (waterway

profile) in text format

Handheld unit of the ADCmounted on the measuring rod PDA for the OTT Qliner 2

Powerful software for data processing and visualization

QuantitativeHydrology


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www.ott.com

OT T flow measurement

Mobile measurement systems

93.0

00.0

04.I.E

06-11/2013

Germany

OTT Hydromet GmbHTel. +49 831 5617-0Fax +49 831 [email protected]

FranceOTT France

Tl. +33 (0)4 42 90 05 90Fax +33 (0)4 42 90 05 [email protected]

SwitzerlandOTT HYDROMETRIE AG

Tel. +41 56 470 64 34Fax +41 56 491 21 [email protected]

Austria

OTT Hydromet GmbHBranch office Austria

Tel. +43 7235 8899-8Fax +43 7235 [email protected]

SpainOTT MedioAmbiente

Tel. +34 91 651 47 69Fax +34 91 659 02 [email protected]

UK & Ireland

OTT Hydrometry Ltd.Tel. +44 1246 573 480Fax +44 1246 813 [email protected]

India

OTT HydrometTel. +91 11 7109 48 24Fax +91 11 7109 48 [email protected]/india

Asia Pacific

OTT HydrometTel. +65 6448 7626Fax +65 6448 [email protected]

Mexico & Central AmericaHACH Mexico

Tel. +52 55 5393 1514

[email protected]

South AmericaOTT Hydromet

www.ott.com

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