OTT ADC Manuel utilisateur
DOC026.53.80104
OTT Acoustic Digital Current
(ADC) Meter
05/2013, Edition 3 (North American Version) 10.500.001.B.U.
User Manual
Table of Contents
Specifications..............................................................................................................3
General information..................................................................................................4
Safety information........................................................................................................4
Use of hazard information............................................................................................ 4
Precautionary labels....................................................................................................5
Certification..................................................................................................................5
Product overview.......................................................................................................6
System components....................................................................................................6
About the sensor..................................................................................................8
Temperature compensation.................................................................................. 8
Installation.....................................................................................................................8
About the power supply and battery............................................................................8
Battery specifications ........................................................................................... 9
Charge the battery................................................................................................9
Connect the sensor cable to the handheld unit...........................................................9
To disconnect the sensor...................................................................................10
Attach the handheld display unit to the wading rod...................................................10
Attach the sensor to a wading rod.............................................................................12
Operation.....................................................................................................................12
Turn the handheld unit On and Off............................................................................12
Display screen...........................................................................................................13
Operating key icons ..................................................................................................13
Menu navigation and data entry................................................................................14
Display symbols ........................................................................................................14
Main Menu ................................................................................................................15
System settings.........................................................................................................15
Advanced settings ....................................................................................................16
Upgrade firmware......................................................................................................17
Performing measurements..................................................................................18
Station set up.............................................................................................................18
Angle of flow.......................................................................................................19
Quality control............................................................................................................19
Adjust quality thresholds..................................................................................... 20
Quick quality checks..................................................................................................21
Internal quality check.................................................................................................22
Calibrate the pressure cell (depth calibration)...........................................................22
Turn the depth sensor on or off..........................................................................23
About sensor offsets..................................................................................................23
Perform a single point measurement.........................................................................24
Velocity and discharge measurement methods.........................................................24
Methods for velocity measurement..................................................................... 24
Methods of discharge calculation.......................................................................26
Measurement settings menus.................................................................................... 28
Measurement settings [1/3] ...............................................................................28
Measurement settings [2/3]................................................................................28
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Measurement settings [3/3]................................................................................29
Field quality checks...................................................................................................30
Perform a discharge measurement...........................................................................30
Perform an ICE measurement...................................................................................33
Discharge measurement window .............................................................................. 34
QReview discharge measurement summary file.......................................................35
Delete a file................................................................................................................36
QReview software....................................................................................................36
Overview....................................................................................................................36
QReview main menu options ............................................................................. 37
Installation..................................................................................................................37
Install the QReview software..............................................................................37
Operation...................................................................................................................37
Change the language.........................................................................................37
Change the units................................................................................................38
Connect the ADC................................................................................................ 38
Retrieve ADC data.............................................................................................. 39
Open and view ADC data files............................................................................ 40
Export data.........................................................................................................43
Edit screen.......................................................................................................... 43
Print a report.......................................................................................................44
Maintenance...............................................................................................................44
Handheld unit maintenance.......................................................................................45
Sensor maintenance..................................................................................................45
Troubleshooting.......................................................................................................45
Measurement guidance.............................................................................................45
Common problems....................................................................................................45
Device warning messages ........................................................................................46
Measurement warnings and errors ...........................................................................47
View system status....................................................................................................48
Contact information................................................................................................48
Table of Contents
2
Specifications
Specifications are subject to change without notice.
Specification Details
Velocity measurement (Acoustic
Ultrasonic Transducers)
Measurement range: – 0.2 m/s to 2.4 m/s (–0.65 ft/s to 7.87 ft/s)
Accuracy: ±1% of the measured value, ±0.25 cm/s (±0.01 ft/s)
Resolution: 0.001 m/s (0.001 ft/s)
Ultrasonic transducers
Frequency: 6 MHz
Beam angle: 20°
Measured volumes
Distance from the sensor: 10 cm (3.93 in.)
Diameter: 1 cm (0.39 in.) per sound pulse
Length: 5 cm (1.97 in.)
Depth measurement (Piezoresistive
pressure cell (absolute))
Measurement range: 0 to 5 m (0 to 16.4 ft)
Accuracy: 0.1% FS
Resolution: 0.01% FS
Maximum overload: 1.5 times the measuring range
Temperature measurement
Measuring range: –5 to 40°C (23 to 104 °F)
Accuracy: ± 0.5 °C
Resolution: 0.1 °C (0.1 °F)
Salinity Range: 0 to 50 ppt (mg/L)
Power supply
Type of batteries: Rechargeable NiMH, fixed battery pack
Life duration: > 14 hours (the battery lifetime is affected by
environmental conditions and charging cycles)
Charging cycles: > 500 (charging cycles vary by use, environment and
other factors)
Nominal voltage: 9.6 VDC
External class II AC/DC power supply: Input 90–240V, 50/60 Hz
Output voltage of power supply: 18 VDC/VAC
Operating conditions
Operating temperature range: –20 to 60 °C (–4 to 140 °F)
Storage temperature range: –40 to 85 °C (–40 to 185 °F)
Shock resistance: compatible with EN 60068-2-32
Dimensions and weight
Cylindrical sensor body: Ø 40 mm (0.20 in.)
Length: 14.5 cm (5.71 in.)
Weight in air: 800 g (1.76 Ib)
Weight in water: 620 g (1.37 Ib)
Handheld unit:
Dimensions: 23.3 x 8.3 x 3.2 cm (9.20 x 11.41 x 1.26 in.)
Weight: 700 g (1.76 Ib)
English 3
Specification Details
Material
Sensor housing: Delrin®/stainless steel
Screws: stainless steel
Handheld unit: aluminium, powder coated
Keypad: Autotex V 150 XI
IP protection class Handheld unit: IP65 (housing, keypad)
Sensor: IP68
EMC
EN 61000-6-2
EN 61000-6-4
FCC Part 15
EMC Directive 2004/108/EU, Article 5
Internal data memory Capacity: 4 MB (flash)
OTT QReview software
Operating system: Windows®98, Windows®ME, Windows®NT,
Windows®2000, Windows®XP, Windows® Vista, Windows® 7
Functionality: Data transfer from handheld unit, Data check and
processing, Data export (XML, ASCII)
General information
Revised editions are found on the manufacturer’s website.
Safety information
N O T I C E
The manufacturer is not responsible for any damages due to misapplication or misuse of this product including,
without limitation, direct, incidental and consequential damages, and disclaims such damages to the full extent
permitted under applicable law. The user is solely responsible to identify critical application risks and install
appropriate mechanisms to protect processes during a possible equipment malfunction.
Please read this entire manual before unpacking, setting up or operating this equipment. Pay
attention to all danger and caution statements. Failure to do so could result in serious injury to the
operator or damage to the equipment.
Make sure that the protection provided by this equipment is not impaired. Do not use or install this
equipment in any manner other than that specified in this manual.
Use of hazard information
D A N G E R
Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate injury.
N O T I C E
Indicates a situation which, if not avoided, may cause damage to the instrument. Information that requires special
emphasis.
4 English
Precautionary labels
Read all labels and tags attached to the instrument. Personal injury or damage to the instrument
could occur if not observed. A symbol on the instrument is referenced in the manual with a
precautionary statement.
This symbol, if noted on the instrument, references the instruction manual for operation and/or
safety information.
This symbol indicates that a risk of explosion is present.
This symbol indicates that a risk of fire is present.
This symbol indicates the need for protective eye wear.
Electrical equipment marked with this symbol may not be disposed of in European public disposal
systems after 12 August of 2005. In conformity with European local and national regulations (EU
Directive 2002/96/EC), European electrical equipment users must now return old or end-of-life
equipment to the Producer for disposal at no charge to the user.
Note: For return for recycling, please contact the equipment producer or supplier for instructions on how to return
end-of-life equipment, producer-supplied electrical accessories, and all auxiliary items for proper disposal.
Certification
Canadian Radio Interference-Causing Equipment Regulation, IECS-003, Class A:
Supporting test records reside with the manufacturer.
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de classe A répond à toutes les exigences de la réglementation canadienne
sur les équipements provoquant des interférences.
FCC Part 15, Class "A" Limits
Supporting test records reside with the manufacturer. The device complies with Part 15 of the FCC
Rules. Operation is subject to the following conditions:
1. The equipment may not cause harmful interference.
2. The equipment must accept any interference received, including interference that may cause
undesired operation.
Changes or modifications to this equipment not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment. This equipment has been tested
and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules.
These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference, in which case the user will be required to
correct the interference at their expense. The following techniques can be used to reduce
interference problems:
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1. Disconnect the equipment from its power source to verify that it is or is not the source of the
interference.
2. If the equipment is connected to the same outlet as the device experiencing interference, connect
the equipment to a different outlet.
3. Move the equipment away from the device receiving the interference.
4. Reposition the receiving antenna for the device receiving the interference.
5. Try combinations of the above.
Product overview
The OTT Acoustic Digital Current meter (ADC) is a mobile acoustic current meter designed
specifically for measuring point velocities and water depth in open channels and natural streams.
Examples of ideal uses include single or multiple point velocity measurements and discharge
measurements.
Velocity and depth information from the sensor is displayed in real time on the graphical display of
the handheld unit.
Discharge measurements are based on standard vertical or sub-section measurement techniques
associated with MID and MEAN section discharge calculations. The process used to calculate
discharge measurements is based on internationally recognized USGS and ISO748 standards. Mean
velocity and depth measurements taken by the OTT ADC, along with the position of a vertical relative
to a reference, are used to calculate the discharge.
All measurements, including quality checks, velocity and discharge measurements can be
downloaded using the QReview application software. QReview displayed provides basic analysis
tools, graphics, one-second time series, reports, and review of potential quality issues. Data can be
exported in different formats.
System components
The system consists of two components: the sensor, and the handheld display with sensor
connection cable. The sensor itself contains two 6 MHz acoustic transducers, along with a
temperature and depth sensor.
Other components of the system include wading rod adapter, power adapters, charging and
connection cables. Refer to Figure 1 for a complete list of system components.
The handheld unit contains calibration data for the temperature sensor and the pressure cell of the
relevant sensor. Sensors and handheld units that are used together as part of the same
measurement system must have the same serial numbers. The sensor serial number is engraved on
the rear of the sensor body, below the sensor cable connector. The serial number is also listed on
the gray label on the back of the handheld display.
6 English
Figure 1 OTT ADC components
1 Location of user documentation and software 6 Wading rod (accessory)
2 USB charging cable 7 Mounting clamp
3 USB download cable 8 Sensor
4 Power charger (not shown, located below handheld
unit)
9 ADC handheld unit
5 AC/DC adapter
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About the sensor
The sensor components are shown in Figure 2.
The transducers transmit ultrasonic signals which are reflected back to the sensor by air bubbles or
particles suspended in the water column. These received backscatter echoes are amplified in the
sensor head and digitized in the digital signal processor (DSP) inside the handheld display. This
transmit-and-receive process is repeated to generate a second echo pattern. The DSP uses a pulse-
coherent technique to calculate the phase of each returned pulse echo. Phase differences (lag time)
between the returned pulse echoes is proportional to the flow velocity. Each measurement is
validated against quality thresholds for accuracy.
Figure 2 Sensor components
1 Sensor head 4 Sensor end piece (for attachment to wading rod)
2 Sensor connection cable 5 Ultrasonic transducers
3 Pressure cell chamber 6 Temperature sensor
Temperature compensation
The OTT ADC is equipped with a temperature sensor. Water temperature is an important parameter,
both for the calculation of the speed of sound and for the temperature-compensated depth
measurement given by the pressure cell. Therefore, a best practice when starting a measurement is
to allow the sensor to adjust to the water temperature. The temperature adjustment of the sensor
under extreme conditions (from approximately 50 ºC to 5 ºC) takes approximately 5 to 6 minutes.
Installation
CAUTION
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
About the power supply and battery
WARNING
Explosion hazard. Incorrect battery installation can cause the release of explosive gases. The battery
pack cannot be replaced by the user. Contact technical support.
8 English
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