Mobile measurement systems
OTT measurement systems
_ Reliable measurement technology
_ Well-thought-out solutions
_ Proven procedures
_ Precise data
OT T flow measurement
Mobile measurement systems
Mobile flow measurement
OTT company
founding
First meter
production
“Universal”
suspended
meter
OTT measurement
channel
(max. 3.5 m/sec)
Continued
­development
OTT meters
OTT C31
OTT C2
OTT Nautilus
(magnetic
inductive sensor)
1973
1974
1991
OTT calibration tank
(max. 10 m/sec)
1993
Acoustic/
magn. inductive
current meters
...
1873
1881
around 1890
1925
Mobile flow measurement
The mobile flow measurement counts as one of the oldest routine
work relating to waterways.
Since the invention of the mechanical meter in 1790, flows have
been determined according to the traditional verticals procedure.
This procedure is an indirect measurement procedure, where both
the average flow velocity at specified verticals is recorded as well
as the flow cross-section.
Using the measurement values, at the end of a measurement the
flow can be calculated using a mathematical model.
Characteristics / Advantages
__Compact, functional design
__Safety clutch
__Optimized cable guide
__Secure holding of the load
with the automatic mechanical
brake or spring-applied brake
__Flexible drive type
__For mobile suspended meter
measurements
2006 2007
2012
OTT single-drum winches
Mobile measurement with suspended meters
With flow measurements with suspended meters, the measurement equipment hangs on a steel cable and is brought into the
relevant measuring position using an electrical or mechanical
winch.
If the measurement cross-section is in the area of a bridge, or if
a survey vessel is available, mobile measurement is possible. For
this, the suspended meter is brought into position at the required
measurement point using a single-drum winch with a fixed
mounting on a boom.
Quantitative Hydrology
Compact, reliable and easy to operate
OTT offers both mechanical and electrical single-drum winches
that are designed for loads between 25 and 100 kg. The winches
are light and safe to operate. They ensure secure holding of the
suspended meter and are protected against overload, so that
even if the meter is caught by flotsam, for example, it does not
represent a problem. The lowering depth can be comfortably read
from the built-in depth counter.
Verticals procedure
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.
The verticals procedure, an internationally recognized standard,
is comprehensively documented in various rules and standards
such as in the ISO standard 748.
In practice, with this method current meters are used that enable
the measurement of the flow velocity at individual points or the
recording of a complete velocity profile at the verticals.
Cable way on request
For stations without a bridge or survey vessel, on request we also
offer a stationary cable way that is TÜV tested and fulfills all safety
requirements. To move the suspended meter horizontally and vertically, our cable ways are equipped in each case with a double-drum
winch, which can be driven mechanically or electrically and has a
distance or depth counter.
All OTT current meters are conceived for flow measurement using
the classic verticals procedure. From the smallest meter to a
sophisticated measurement system – reliable data and the appropriate application in practice are in the foreground at OTT.
Bridge boom with
OTT single-drum winch
OT T C2 and C31
Classic flow measurement with proven meters
Characteristics/Advantages
OTT C2
__Exact measurement of the
flow velocity from as low as
0.025 m/s
__For the most shallow water
from 4 cm
__Robust and indestructible
__Compact and easy to
transport
Tradition for over a hundred years
The classic among the current meters is the OTT meter. Proven
thousands of times, it is in operation worldwide as the standard
measurement device.
With OTT meters, the point flow velocity is determined using the
number of propeller rotations at a measure point. Careful and individual calibration of the devices in our calibration tank in Kempten
guarantees long-term, reliable measurement results.
Even under extreme conditions, OTT meters deliver exactly what
they promise – high-quality materials and the extremely robust
construction make sure of it.
Characteristics/Advantages
OTT C31
__Exact measurement of the
flow velocity
__Wide range of applications
from 0.25 m/s to 10 m/s
__Robust and indestructible
__Can also be used for checking
current and flow meters
__Can be used universally as
rod-mounted or suspended
meter
OTT C2
With its small dimensions, the OTT C2 has its niche in very
shallow 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 at
stations that are difficult to reach.
OTT C31
Signal counter set OTT Z400
Technical Data
OTT C2
Ø propeller (mm)
30; 50;
Propeller pitch (m)
0.05; 0.10; 0.25; 0.50
Propeller material
aluminum
v min. (m/s)*
0.025; 0.030; 0.035;
0.050; 0.055; 0.060
v max. (m/s)*
1.0; 2.0; 4.0; 5.0
Exact calibration
in our in-house calibration tank
A modern, digital, signal counter for registering the propeller
rotations (impulses) is available with the OTT Z400.
OTT C31
80; 100; 125
0.125; 0.25;
0.50; 1.00
aluminum;
plastic
0.025; 0.030; 0.035;
0.040; 0.055; 0.060;
2.5; 3.0; 5.0; 6.0; 10.0
*The velocity measurement ranges are dependent on the diameter and pitch of the
propeller used
Using a connection wire, the meter is simply attached to the
signal counter. The simple membrane keyboard allows the
largest hands to use it reliably.
The device can save meter equations internally and display
both the number of impulses counted and the flow velocity
itself.
Digital signal counter set
OTT Z400
Quantitative Hydrology
The OTT C31 can be used both in small flowing waterways
with low depths and in deeper waterways with higher velocities. Depending on the application, the meter can be used on
a measuring rod or, mounted on a weight, as a suspended
meter.
OT T ADC
Ultrasound technology for the traditional rod measurement
Quantitative Hydrology
Characteristics/Advantages
__Can be used with conventional measuring rods
__Familiar measurement process
__Step-by-step user guidance
__Correct immersion depth can
be read on display
__Automatic flow calculation in
accordance with international
standards
__High measurement accuracy
__Can be used in a variety of
situations such as rivers,
streams, canals, dams
Handy handheld unit from
OTT ADC
Contemporary rod measurement in the proven way
The OTT ADC (Acoustic Digital Current meter) measures point
­velocities in open channels using acoustic signals. Highly
­developed procedure for signal evaluation guarantees precise
and reliable measurement results.
Precise measurement values
and data always available
Similar to a meter, the OTT ADC can be used on conventional
measuring rods. It does not only measure the flow velocity at
the measuring point, but is also equipped to measure the depth:
A pressure cell integrated in the sensor automatically determines
the water depth at the vertical and the immersion depth of the
device.
Sophisticated measurement process
The ultrasound transducers of the OTT ADC transmit signals
at short intervals. These are reflected by, for example, floating
material in the water and return as an echo. Using mathematical
methods, the OTT ADC checks two sequential echos for similarity
and determines their time shift. This is then used to calculate the
flow velocity. The most modern technology, intelligent evaluation
algorithms and integral quality checks guarantee a high accuracy
of 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 partial
and total flows are saved in the handheld unit and can be simply
called from there. For further use, the user can transfer the data
to a PC using the OTT Qreview processing software and process
it there.
Step-by-step user guidance
The display on the handy handheld unit helps the user to position
the sensor exactly. The other data are also easy to read on the
display. The software for the handheld unit leads the user from
edge to edge, step by step, and at the end of each measurement
calculates the flow.
Technical Data (1)
Technical data (2)
Velocity measurement:
Measuring range Accuracy
- 0.2 m/s … 2.4 m/s
± 1% of the measured value ± 0.25 cm/s
Operating temperature
-20 °C … +60 °C
Supply voltage9.6 V DC (permanently
installed battery)
Life
typically 14 hours
Acoustic frequency
Ultrasonic transducers
6 MHz
Depth measurement (piezoresistive absolute pressure cell)
Minimum water depth
4 cm
Measuring range
Resolution
Accuracy
Methods for
discharge calculationMid section method
EN ISO 748
Mean section method
Easily read display
with important data
on the measurement
0…5m
0.01 % FS
0.1 % FS
OT T MF pro
Versatile magnetic-inductive sensor
Rod measurement using magnetic-inductive sensor
The OTT MF pro unit is an easy-to-use magnetic-inductive
current meter that requires nearly no maintenance and is
designed to cost-efficiently measure point velocities in open
channels and canals.
Reliable data within shortest
period of time
The compact and rugged sensor is attached to the measuring
rod. The measuring procedure is similar to that of the OTT ADC
unit, however, a magnetic-inductive sensor is used with the OTT
MF pro unit. Its compact design allows measurements to be
performed even in very shallow water.
The point velocities measured and the flow that is automatically calculated are visualized in real time which allows trends
to be recognized immediately. And thanks to the transflective
color display, information and instructions can be read even in
sunlight.
Faraday measuring method
A magnetic coil incorporated in the sensor head creates a
magnetic field. When water is passing the sensor head the
water ions create a voltage that relates to the flow velocity. It is
obtained by means of two electrodes and then amplified. A smart
microprocessor processes the signals and sends the results to
the handheld unit.
Extended application
Because of the measuring method, the OTT MF pro unit
provides reliable results, also with low flow velocities. Even in
turbulent flow conditions or high suspended matter content,
the unit provides dependable data and may be used both in
weed-infested and dirty waters.
Technical data (1)
Technical data (2)
Velocity measurement:
Operating temperature
Supply voltage
Life
Measuring range Accuracy 0 … 3 m/s
Accuracy 3 … 5 m/s 0 m/s … 6 m/s
±2 % of the measured value ± 0.015 m/s
±4 % of the measured value ± 0.015 m/s
Minimum water depth
3.18 cm
– 20 °C … +60 °C
Lithium-ion battery
typically 18 hours
Depth measurement (optional):
Sensor
Absolute pressure sensor with
single point calibration
Measuring range
0 … 3.05 m
Accuracy*the larger of ±2% of the measured
value or ±0.015 m
Methods for
discharge calculationMid section method
EN ISO 748
Mean section method
Field-proven handheld unit of the
OTT MF pro
Field operations made more easy
Operating the OTT MF pro can easily be learned based on the
definite instructions provided on the display of the handheld
unit. No manual logging required, since all data is automatically stored. This saves time and prevents copying errors.
The stored data may easily be transferred to a PC via the
USB interface.
Compact
and rugged sensor
*Steady state temperature and static non-flowing water
Quantitative Hydrology
Characteristics/Advantages
__Compact, requires low
maintenance
__Usual measurement process
__Intuitive user guidance
__Reduced time
__Optional: Automatic water level
measurement
__Flow calculation according to
international standards
__Also for weed-infested
sections
__With turbulent flow conditions
__In dirty waters
OT T Qliner 2
Mobile flow measurement system with Doppler technology
Characteristics/Advantages
__Exact measurement data
__Robust design
__Automatic flow calculation
__Safety when measuring – no
need to enter the water
__For waterway depths up to
20 m and flow velocities up
to 10 m/s
__No problems with drift and
moving bed
Made for hydrologists
The OTT Qliner 2 is a mobile flow measurement system that
meets all the demands of the real world. It consists of an ultrasound Doppler current sensor, a robust glass-fiber boat as device
carrier, a Bluetooth data transfer unit and a waterproof PDA
(Personal Digital Assistant).
Simple process according to
known measuring method
Measurement process
Important parameters on the measurement cross-section and
process are entered into the operating software of the PDA by
the user.
For the actual flow measurement, the boat is positioned at the
vertical to be measured using cable guides. The boat remains
stable and secure in the flow even at high speeds – and even with
moving bed the Qliner 2 provides reliable measurement values.
Corresponding to the verticals procedure, at defined verticals of
the flow cross-section the OTT Qliner 2 measures the water depth
and the vertical velocity distribution precisely and reliably.
Wireless communication
Generally, the PDA and the electronics of the OTT Qliner 2 communicate 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.
Using the measurement data, it then calculates the average flow
velocity at the verticals, the partial flow of individual flow segments
and then the total flow. In this it uses the mid-section method, an
international standard.
Quantitative Hydrology
After completing the measurement, the user can transfer the
data to a PC and process it further there using the OTT Qreview
software.
Technical data (1)
Technical data (2)
Velocity measurement
Operating temperature
Supply voltage
Life
-10 … +60 °C
12 V DC (rechargeable battery pack)
typically 1 day use in the field
Pocket PC (PDA)
Type
Nomad (Timber Tec)
Radio connection
Frequency
Type
Range
2.4 GHz
Bluetooth class 1
up to 150 m
(depending on environmental conditions)
Measuring range
± 10 m/s
Accuracy± 1% of the measured value ± 0.5 cm/s
Convenient remote control
from the bridge
Transducer frequency
Max. range
(water depth)
1 MHz
2 MHz
20 m
10 m
Minimum water depth
1.20 m
0.35 m
Waterproof and robust
handheld unit (PDA) of the
OTT Qliner 2
OT T Qreview
Powerful software for data processing and visualization
Characteristics/Advantages
__Validation of flow measurement data __Clear representation of the
measurement cross-section
and the different values
measured
__Convenient processing
__Simple data export to XML or
TXT format
__Specially conceived for
data from OTT ADC and
OTT Qliner 2
Evaluation software included
Flow measurements that have been carried out with the OTT ADC
or 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 the
OTT Qreview software.
Powerful and at the
same time completely
uncomplicated
Useful functions
You can confidently save yourself laborious evaluation of flow
data with OTT – it is dealt with by the software. With clear
menu functions you only need a few clicks to get to where you
are going. The numerous functions include:
;;
The comprehensive functions of OTT Qreview make it possible to
validate the data and offer convenient routines for further processing. An export to external databases can also be done with a few
steps with OTT Qreview.
;;
;;
The processing software OTT Qreview is included with the OTT
ADC or OTT Qliner 2.
;;
;;
;;
;;
Quantitative Hydrology
;;
isualization of the measurement cross-section with the
V
measured velocities in each case
Visualization of individual verticals
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 of
flow
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 ADC
mounted on the measuring rod
PDA for the OTT Qliner 2
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Germany
OTT Hydromet GmbH
Austria
OTT Hydromet GmbH
Branch office Austria
Tel. +49 831 5617-0
Fax +49 831 5617-209
info@ott.com
www.ott.com
Tel. +43 7235 8899-8
Fax +43 7235 8899-1
m.schinnerl@ott.com
www.ott-austria.at
UK & Ireland
OTT Hydrometry Ltd.
Asia Pacific
OTT Hydromet
India
OTT Hydromet
Tel. +44 1246 573 480
Fax +44 1246 813 873
sales@ott-hydrometry.co.uk
www.ott-hydrometry.co.uk
Tel. +65 6448 7626
Fax +65 6448 7176
c.aw@ott.com
www.ott.com
Tel. +91 11 7109 48 24
Fax +91 11 7109 48 17
someshkumar@hach.com
www.ott.com/india
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OTT France
Switzerland
OTT HYDROMETRIE AG
Spain
OTT MedioAmbiente
Mexico & Central America
HACH Mexico
South America
OTT Hydromet
Tél. +33 (0)4 42 90 05 90
Fax +33 (0)4 42 90 05 95
info@ottfrance.fr
www.ottfrance.com
Tel. +41 56 470 64 34
Fax +41 56 491 21 06
info@ott-schweiz.ch
www.ott-schweiz.ch
Tel. +34 91 651 47 69
Fax +34 91 659 02 09
info@ott-medioambiente.com
www.ott-medioambiente.com
Tel. +52 55 5393 1514
www.ott.com
r.hijosa@hach.com
www.ott.com
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