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Operating instructions Acoustic, digital current meter OTT ADC

1. In practical use in the field there are naturally often small deviations from the optimum sensor alignment leading to angled flows These but also angled flows resulting from the cross sections e g near to vertical edge walls lead to angles of flow that are not equal to zero Due to the measuring principle and the location of the ultrasonic transducers the OTT 15 relatively little affected by angular flows In field tests the measure ment of the velocity was found to be unaffected by angular flows of up to 10 Furthermore the measurement error is approx 6 with an angle of flow of 20 and approx 8 with an angle of 30 Please note Align the sensor visually so that it is positioned towards the flow and ot right angles to the measurement cross section 43 44 8 2 Temperature compensation The OTT ADC is equipped with a temperature sensor The water temperature is an important parameter both for the calculation of the speed of sound and for the temperature compensated depth measurement with the pressure cell The temperature adjustment of the sensor under extreme conditions from approx 50 C to 5 C takes approx 5 to 6 minutes Please note Before beginning the measurement wait approx 5 minutes until the sensor has adjusted to the temperature of the water 8 3 Depth calibration The OTT ADC is equipped with an absolute pressure cell In order to be able to measure the depth of the sensor exactly
2. Avg Depth Average water depth Area Size of the measurement cross section m Subsequent window Data Files Vertical nr i x Shows the results for each individual vertical The percentage value x26 shows what proportion of the total discharge is represented by the partial discharge of the vertical i Position Distance of the vertical i from the reference point m Discharge Partial discharge represented by vertical i m3 s Avg Velocity Average flow velocity at vertical i m s Depth Water depth at vertical i m Area Cross section of the measured discharge seg ment represented by vertical i m2 s 7 5 Delete files menu Using this menu you call the sub menu Delete which contains a list of all files saved on the handheld unit Here you can delete files that are no longer required After selecting the files to be deleted a warning is displayed You can continue deleting or cancel the process 39 40 7 6 System status menu Using this menu you can call the System Info sub menu which contains informa tion on the handheld unit Sub menu System Status System Info Free Memory Available memory relative in and absolute in points Battery Charging state of the battery in Serial Nr Serial number of the handheld unit Only a sensor with the same serial number may be connected to the handheld unit Fw Firmware version The firmware is a program permanently integrated in the handheld uni
3. 1 5 and is the product of the average cross section velocity and the discharge cross section flowed through The discharge measurement with the classic verticals process is an indirect mea suring method The goal of the measurement is to determine the average flow velocity of the specified verticals and at the same time determine the discharge cross section In this way it is possible to calculate the discharge using a mathe matical model at the end of the measurement see Section A 2 Overview Meth ods of flow calculation A 1 Overview Methods for velocity measurement The average flow velocity at a vertical is calculated from a defined number of individual measurements at different depths Applied to the vertical depth these individual velocities give an image of the velocity distribution velocity surface see also hatched surface in Figure 18 The quotient of velocity surface and water depth is the average flow velocity For the arrangement of individual points there are various methods The following methods can generally be differentiated Velocity distribution method multi point method Method with reduced measure points Supplementary methods Tab 3 Methods supported by the OTT ADC for velocity measurement The following table contains an overview of all methods for velocity measurement that are supported by the OTT ADC Method 1 point measure ment 2 point measure ment 3 point measure ment
4. A point measure ment 5 point measure ment 6 point measure ment 2 point Kreps 1 point mea surement 2 point ice mea surement Surface measure ment Multi point mea surement Position of mea sure points 0 6 xh 0 2 0 8 xh 02 0 6 0 8xh Doc a P near to surface 0 0 6 O 8xh near to bed near to surface 0 2 0 4 0 6 0 8 x h near to bed near to surface 0 62 xh 0 5 x hetfective 0 2 0 8 heffective near to surface Number and posi tion of the measure points are freely selected Formula for calcu lating the mean velocity Vin Comments Vin Vo 2 Vos 2 A Vin 0 25 2x Vo 4 Vos Vin 0 25 x Vo2 Voz Vos m 0 1 x Vo 3 x Vo2 3 x Vos 2 V3 Vin 0 1 x Vo 2 x Vo2 2xVo4t2x Vos 2 Vos Vs Vin 0 31 x Vo 0 634 x Voe2 Vin Vos X Kice Vin Vos 2 Vin Vo x Ko See figure 19 A Method with reduced measure points Advantage Disadvantage lower time requirement based on the assumption of a consistent logarithmic velocity distribution B B Kice 0 88 0 90 ISO 1996 Ko 0 84 0 9 ISO 748 D With new stations it is recommended to confirm the accuracy of the method with reduced measure points by using comparative measurements with the multi point method 59 60 Tab 4 Number of measure points in relation to the
5. impulses per sound pulse which are transmitted in a burst lasting 75 ms From this the measured values each second for velocity SNR and correlation are gener ated Each measured value is subject to an internal quality check see Chapter 8 Appendix C Firmware upgrade The firmware relevant to the user is a program integrated into the handheld unit that is responsible among other things for the representation of menus sub menus and subsequent windows Every handheld unit is supplied with a particular ver sion of the user firmware The version can be queried via the main menu 2 2 See menu System Status System Info Example of output 1 03 117 The last three numbers in the example 117 constitute the version number which is part of the firmware file name An upgrade of the firmware is only necessary if OTT Hydromet releases a new firmware version for example if new functions have been included Information on any releases can be found on the Internet at www ott com Here you can find the current firmware Firmware file name ADC_Vxxx bin xxx Version number The file name must not be changed Carry out the upgrade The processing program OTT QReview is available to carry out the upgrade of the user firmware The upgrade is carried out in two steps 1 Put the handheld unit into upgrade mode 2 Carry out the upgrade Requirements The batteries of the handheld unit are charged battery symbol in display is completely
6. 4 3 61000 4 3 und den hinterlegten Pr fberichten bereinstimmt und damit den Bestimmungen entspricht and the taken test reports and therefore corresponds to the regulations of the Directive et les rapports d essais notifi s et ainsi correspond aux r glement de la Directive Ort und Datum der Ausstellung Kempten den COO AM Ou Place and Date of Issue Lieu et date d tablissement Name und Unterschrift des Befugten X Ne Ves Name and Signature of authorized person Nom et signature de la personne autoris e Peter Fend Director R amp D OTT MESSTECHNIK GmbH amp Co KG Gesch ftsf hrer Dr Ing Anton Felder Pers nlich haftende Gesellschafterin OTT MESSTECHNIK Verwaltungs GmbH Postfach 21 40 87411 Kempten Sitz der Ges Kempten Registergericht Kempten HRB 7687 und HRA 3807 USt ID Nr DE 128 780710 Steuer Nr 127 171 51206 LudwigstraBe 16 8 437 Kempten WEEE Registrierungs Nummer 49590817 Tel 349 0B 1 99 17 0 Deutsche Bank AG M nchen BLZ 700 700 10 Kto Nr 409 0304 00 BIC DEUTDEMM IBAN DE96 7007 0010 0409 0304 00 Fax 49 0 8 31 5617 209 info ott com Es gelten unsere Allgemeinen Gesch ftsbedingungen siehe www ott com AGB www ott com All business transactions shall be subject to our General Terms and Conditions see www ott com GTC 70 iew main menu Appendix H Overv Main menu part 1 H 1 eBuoupsiq eoppng 051 pup
7. Discharge START Vertical i Position or Next vertical i Position Depth cannot be zero Please enter a valid depth At the start of the measurement of the first measure point of a new vertical the water depth is automatically set to zero The user is thus forced to give the water depth for each vertical 2 Measure water depth Discharge START Start Measuring Point i Water Depth Not enough valid data There are not enough valid measured values available to calculate the average flow velocity Possible causes are an SNR value that is too low or water turbu lence that is too high each of which can lead to invalid measurements see also Chapter 8 4 Internal quality check 51 52 11 2 Critical error messages If a critical error message is displayed a discharge measurement started cannot be finished FILE SYSTEM FAIL Press 1 to FORMAT Can occur once after switching on a new handheld unit for the first time or a handheld unit with a new flash memory chip gt Press key 1 and format the flash memory Could not open close write to delete the file Error in internal file system gt Format recorder Advanced Format recorder If the error reoccurs there is a device error gt Send the handheld unit and sensor to the OTT repair center Error while starting sensor The CPU Central Processing Unit of the handheld unit could not make a con nection to the digital signal processor at startup 2 Send the
8. by pressing the relevant number on the keyboard of the handheld unit Some subsequent windows are accessed by using the operating keys Main Menui 1 2 Main Menu 2 2 1 Discharge 1 Delete files 2 Depth Calibration 2 System Status 3 View Data 3 System settings 4 Advanced ee The following sections describe the individual menus and their sub menus and subsequent windows A detailed view of the most important display views can be found in the brief instructions For an overview of the main menu see Appendix H 27 28 7 2 Discharge measuring menu In this menu the basic settings are made for a discharge measurement and the measurement is started Settings Name Party Notes START Making basic settings for the measurement The basic settings are used as input parameters for internal advance planning of measurements and for calculating partial flows and complete discharge Enter the file name for the measurement Input format alphanumeric max 8 characters Enter the name of the party Input format alphanumeric max 30 charac ters Enter notes Input format alphanumeric max 80 charac ters Start discharge measuring Sub menu Discharge Measuring Settings This sub menu is divided into three subsequent windows in which you enter para meters for the measurement cross section the type of measurement and the calcu lation method The measurement time is also
9. confirming the message all set tings on the handheld unit are deleted and reset to the settings at delivery Subsequent window Advanced Advanced Language Choice of English Dutch German Spanish and French The currently set language is marked with Subsequent window Advanced Advanced Units The currently set unit is marked with Metric Imperial Measured values and distances are calculated and displayed using the metric system Unit meter Measured values and distances are calculated and displayed using the imperial system Unit foot Fig 17 Sensor alignment with an angle of flow of 0 8 Ensuring data quality To guarantee exact measurement data an internal quality check in the device is necessary as well as correct use and active checking by the user Notes on the correct use of the OTT ADC can be found in the relevant sections of these instructions The following sections describe what should be noted in addi tion to ensure the quality of your measured data 8 1 Angle of flow The angle of flow is the angle between the alignment of the sensor symmetry axis and the direction of flow In an ideal situation the angle of flow is 0 Hydraulically suitable stations exhibit low angles of flow when the sensor is posi tioned at right angles to the measurement cross section and the flow is parallel to the edges Direction of flow Measurement cross section
10. filled The OTT QReview QReview exe software is installed on the PC USB driver of the handheld unit is installed on the PC The current firmware is saved on the PC Please note The batteries of the handheld unit must be fully charged for the upgrade process With insufficient power supply the upgrade process cannot be carried out 1 How to put the handheld unit into upgrade mode Switch off the device Connect the handheld unit to the PC via the USB connection Put the handheld unit into upgrade mode Press key combination and hold and switch on the handheld unit The message FIRMWARE UPGRADE CHECKING STATUS appears on the display After a few seconds the UPGRADE CODE is requested Enter the upgrade code Enter the numbers 1 2 and 4 and confirm press key The handheld unit is now in firmware upgrade mode and ready for the upgrade 65 66 2 How to carry out the upgrade Start OTT QReview In the Tools menu select the ADC Firmware Upgrade menu point Select the current firmware in the subsequent window under Upgrade file and confirm with the Open button Select the COM port Serial Port that is used by the USB interface that the hand held unit is connected to see Chapter 9 2 1 Section Checking the COM port Press the Start button The upgrade is carried out In the Status area of the ADC Firmware Upgrade win dow you can see information on the progress of the upgrade As soon as the upgrade is complet
11. handheld unit and sensor to the OTT repair center Please note If a repair is necessary please send both the handheld unit and sensor in the transport case to the OTT repair center irrespective of which system components are affected by the repair The address of the OTT repair center can be found in Appendix E Repair 12 Troubleshooting The depth measured seems unrealistic Sensor properly calibrated in the air gt Calibrate the pressure cell as described in Chapter 6 2 1 After switching on the handheld unit startup process completed symbols disappear in the display before calibration function was called 2 Only calibrate after the end of the startup process Sand or mud in pressure cell chamber 2 Clean the chamber as described in Chapter 10 2 Sensor correctly connected to the handheld unit gt Check the sensor connection cable Check the number 12 and align ment of the contact pins in the connector see Chapter 4 1 No velocities are displayed during measurement operation Continuous data output set gt Set the measured value display to Continuous Main menu 2 2 System Settings System Menu Display Ultrasonic transducers dirty gt Clean the ultrasonic transducers of any soiling sand mud flotsam such as leaves or similar Sensor correctly connected to the handheld unit gt Check the sensor connection cable Check the number 12 and align ment of the contact pins in the con
12. of flow and the symmetry axis of the sensor is at right angles to the mea surement cross section There should be no obstructions in the immediate vicinity of the sensor Ideally the measurement is carried out from a bridge or a measur ing pontoon If the measurement is taken directly in the water the user must stand at a sufficient distance from the measuring device to ensure an unobstructed flow GAD n U U e How to carry out a discharge measurement Position the sensor at the first vertical Call the Discharge Measuring menu and select Start In sub menu Start Measuring confirm the list of the important basic settings with Ok and continue Lower the sensor to the bottom and select Water Depth in the window of the relevant measure point In the subsequent window confirm the measured water depth return to the window for the relevant measure point Select Ok and continue to call the measuring mode Position the sensor at the first measure point The correct depth is shown on the display of the handheld unit the value Submersion depth of sensor set value blinks until the correct position is reached Start measurement press 6 button 25 26 The measurement now runs for the set time interval After completing the measure ment the result for this measure point is displayed You can reject the measure ment and r
13. supplied with a universal attachment for measuring rods In this way the handheld unit can be attached both to rods with 20 mm and to rods of type USGS There is a fixing plate on the rear of the handheld unit with a permanently attached ball head When attaching the handheld unit to a rod the aluminum plates of the universal attachment clamps onto the ball thus allowing the handheld unit fo move and be rotated in different directions Please note Only attach the handheld unit after the sensor is mounted on the rod see Chapter 5 3 Starting up the sensor How to attach the handheld unit to the rod Clamp the aluminum plates of the universal attachment to the ball on the rear of the handheld unit Loosen the wing nut Clamp the free end of the universal attachment around the rod so that the plastic coated plates surround the rod Lock in the required position with the wing nut Fig 9 Attachment of the ADC sensor to the rod 5 3 Starting up the sensor Before beginning the measurement you have to attach the sensor to the rod and connect to the handheld unit The sensor end piece serves as a mechanical adapter for attaching the sensor to measuring rods 5 3 1 Fixing and positioning the sensor on the 20 mm diameter rod Required components OTT ADC sensor 20 mm diameter rod starting piece extension for rod if necessary How to attach the sensor to the rod Unscrew the fixing sleeve of the sensor
14. to position the sensor on the USGS rod Loosen the fixing screw of the meter sensor bracket Move the sensor and fix at the new position with the fixing screw 19 20 Fig 12 Attachment of the ADC sensor to the USGS top setting wading rod 5 3 4 Fixing and positioning the sensor to rods with USGS top setting wading rod Required components OTT ADC sensor with sensor end piece as mechanical adapter for rod type USGS top setting wading rod of type USGS with appro priate meter sensor bracket extensions for round rod and top setting wading rod if necessary How to attach the sensor to the USGS top setting wading rod Push the sensor with the circular cutout of the sensor end piece mechanical adapter onto the receiver provided on the meter sensor bracket of the top set ting wading rod Ensure the sensor connection cable is pointing upward Press the sensor as far as it goes Fix the sensor with the fixing screw of the mechanical adapter Position the sensor at the required point on the round rod see below Extend the USGS top setting wading rod as required Sensor end piece Meter sensor bracket How to position the sensor with the USGS top setting wading rod Press on the rubber stopper of the catch on the handle of the USGS top setting wading rod and release the catch Move the sensor using
15. waterway depth B Supplementary methods Supplementary methods with which the velocity near the surface Vo and the veloc ity near the bed Vs are measured require that the sensor is positioned as near as possible to the water surface and the waterway bed Near the water surface the sensor must be completely submerged The position of the highest and lowest measure points should be the same for each vertical as far as possible It should be ensured that a measurement immediately below the surface is not influenced by wind and random surface waves C 2 point KREPS measurement Approximation method from the year 1949 where the velocity near the surface and at 38 of the depth are measured It is named after its developer Oberbau rat government building officer Dr techn Harald Kreps Austrian hydrologist The notes under A apply D Multi point method With this method the measure points are allocated freely based on the water depth and flow conditions It is also here important that the highest and lowest measure points are positioned as near to the water surface bottom as possible The following table gives a rough guide to the number of measure points Water depth Purser f mue points lt 1 3 4 1 3 4 6 4 7 5 8 gt 7 6 10 Advantage Exact recording of velocity surfaces Disadvantage Decreasing measurement reliability with varying water levels Fig 19 Calculation of the average flow velocity Fig 20 MEAN sectio
16. 0 00 m 10 00 m 1 00 m 1 00 m alternating 0 00 m 0 00 m 0 70 0 89 0 80 0 00 m 305 O ppt 30 min 305 max 10 max 0 25 m s 0 10 m 0 02 m 40 100 gt 10 db min 0 02 m 1 100 1 10 The values for date and time are carried forward and therefore deviate from the the basic settings when delivered 67 68 Appendix E Repair With a device defect use Chapter 12 Troubleshooting to see if you can resolve the problem yourself In case of device defects please contact the repair center of OTT Hydromet OTT Hydromet GmbH Repaircenter Ludwigstra e 16 87437 Kempten Germany Telephone 49 831 5617 433 Fax 49 831 5617 439 repair ott com Please note Send both the handheld unit and the sensor to the OTT Repaircenter in the trans port case provided irrespective of which component appears to be affected by the fault Warning Only have a defective OTT ADC checked and repaired by the repair center at OTT Hydromet Never make any repairs yourself under any circumstances Any repairs or attempted repairs carried out by the customer will result in the loss of any guarantee rights Appendix F Note on the disposal of old units Within the member countries of the European Union In accordance with the European Union guideline 2002 96 EC OTT Hydromet takes back old devices within the member countries of the European Union and disposes of them in an appropriate way The devices concerned by this are mar
17. 0 1 Handheld unit Ensure that the USB port on the handheld unit is closed with the special protec tive cover when not in use Check the charging state of the battery before and after the measurement and charge the battery if necessary The battery only needs changing after being charged more than 500 times Never replace the battery yourself The replacement must be done at the factory by the OTT repair center see Appendix E Repair Always carefully dry a handheld unit that has been made wet before placing in the transport case Store the handheld unit in the transport case supplied when it is not in use In this way it is protected from dust damp and contamination Wipe the handheld unit with a slightly damp lint free cloth as necessary Do not use wet cloths or aggressive solvents cleaning materials or abrasives 10 2 Sensor Before you pack the device after a measurement remove any contamination and dry the sensor and rods with a dry lint free and absorbent cloth Regularly check the ultrasonic transducers for contamination for example by sand If necessary clean the transducers with a lint free cloth or a soft brush After using the sensor in sandy or muddy waterways the sensor body should be cleaned under clear running water Ensure at the same time that the holes for the pressure cell chambers are washed out so that all contamination is removed With heavy soiling it is recommended that the sensor is first placed
18. 0 10 00 Entry format numerical Note The value for Spacing should be O so thot the OTT ADC can calculate the position of the indi vidual verticals in advance Sequence in which the measure points are processed along the verticals The current set ting is shown on the display In the subsequent window the measurement sequences Surface to bottom Bottom to surface and Alternating are available Distances between sensor base plate and base plate waterway bed The symmetry axis of the sensor where the pressure cell is located never lies directly on the waterway bed and there is therefore a remaining distance When using rods with base plate and tip this extra distance can be larger depending on whether the subsurface is firm or yields The extra distance is important as a parameter for the correct determination of the water depth Subsequent window Discharge Measuring Settings Discharge 1 3 Rod Offsets Sensor offset Point offset Distance between the symmetry axis of the sen sor and the base plate of the rod m Value Range 0 00 1 00 Entry format numerical Distance between the base plate of the rod and the waterway bed m Value range 0 00 0 50 Entry format numerical 31 32 Subsequent window Discharge Measuring Settings Discharge 2 3 Measure method Using Corr factor Methods for velocity measurement The currently selected method is shown on the display In the subsequen
19. 0 136 9 2 16 000 138 9 2 16 000 139 9 2 16 000 140 9 2 16 000 141 9 2 Extension pieces for 20 mm rods 1 m long division into dm 3 4m 16 000 152 3 2 4 5m 16 000 153 3 2 5 6 m 16 000 1 54 3 2 6 7 m 16 000 1 55 3 2 Extension pieces for 20 mm rods 1 m long division into cm upon request HERES top setting wading rod Push on rod for 20 mm rods Allows the sensor to be vertically adjusted in the water The top setting wading rod is 1 m shorter than the respective rod in each case 2 m long 2 part 16 000 081 9 2 3 long 3 part 16 000 082 9 2 4 m long 4 part 16 000 083 9 2 5 m long 5 part 16 000 084 9 2 Direction indicator for rod 16 000 090 4 2 for showing the sensor direction when mounted without HERES top setting wading rod Rod holder 16 000 007 2 1 with carrying strap for a maximum of rod lengths each of 1 m or 5 HERES top setting wading rod pieces each 1 m long Replacement pieces for HERES top setting wading rod starting piece 1 m long 16 000 088 9 2 middle piece 1 m long 16 000 040 9 2 end piece 1 m long 16 000 038 9 2 57 58 Fig 18 Example of a discharge cross section for discharge measurement Appendix A Theory and practical suggestions for discharge measuring with the OTT ADC The discharge in flowing waterways is defined as the water volume that flows through a particular cross section in the time unit DIN 4049 Part 1 It is normally given in m3 s
20. Ends the discharge measurement Before finally ending a warning is shown that allows the process to be canceled Continue Continues the discharge measurement with a further vertical 7 3 Depth calibration menu In this menu you carry out the calibration of the sensor for depth measurement see Chapter 6 2 1 Depth Calibration The integrated pressure cell is calibrated in the current atmospheric pressure conditions at 0 00 m depth of the sensor The sensor must therefore be out of the water The calibration starts as soon as the menu is called Calibrate at Shows the depth at which the calibration is done 0 00 Sensor reading Shows the current measured value for the depth After confirming with Ok and continue the subsequent window Calibrated is dis played which summarizes the results of the calibration At Depth at which calibration took place Measured Depth measured Offset Current air pressure mBar 7 4 View Data menu Using this menu you call the sub menu Data Files which contains a list of all files saved on the handheld unit The files contain information on discharge measure ments previously carried out Subsequent window to sub menu View Data Data Files Shows the results of the complete discharge and partial discharges of the respec tive discharge measurement Subsequent window Data files filename Discharge Total discharge determined m3 s Avg Velocity Average flow velocity m s
21. ID section method mid cross section method With the mid cross section method the measurement cross section is also divided into individual segments The individual segments do not however lie between the verticals but are defined by half the distance to the neighboring vertical in each case For this reason the first and last verticals should be as near to the edges as possible when using this method D 1 Y D 1 Y section zero point o 9 Ving Dh X h The equation given describes the discharge calculation for an individual segment for the MID section method The total discharge is thus the sum of the partial dis charges of all segments Fig 22 Taking account of vertical edges in the discharge calculation Tab 5 Edge factor dependent on the roughness of the edge Comment In practice experience shows that this method leads to more exact results com pared to the average cross section method and is also quicker to calculate It is therefore the default setting for the handheld unit of the OTT ADC Taking account of vertical edges Both previously described methods take account of the flow element in the edge areas with vertical edge walls using the following method Fig 22 o o c b Qr dL Pe 2 a 1 2 Vm2 hi h ZZN qus x hl nn
22. Ka edge factor for allowing for the roughness of the edge wall The edge factor Ke is dependent on the roughness of the edge The Ke values shown in the following table can be considered as guide values Edge characteristics Ke Smooth edge with no vege tation e g concrete steel 0 8 0 9 cement Brick sides with vegetation 0 7 Rough walls 0 6 0 5 with heavy vegetation 63 64 Appendix B Flow velocity measurement with the OTT ADC functional principle For the measurement of the flow velocity the OTT ADC is aligned towards the flow As the sensor body influences the incoming flow dependent on the flow velocity the velocity measurement is a two stage process 1 Rough velocity measurement by a cell near the sensor 2 Exact velocity measurement in measured volumes approx 10 cm in front of the sensor The measurement of the flow velocity is based on the evaluation of the phase dif ference from independent pulse echos For this purpose the ultrasonic transducers of the OTT ADC sensor transmit in each case two short ultrasound impulses with a modulation frequency of 6 MHz Afterwards the sensor receives the reflections caused by particles in the water The signal received is amplified filtered and digitalized With the information attained the phase shift of the two signals is calculated and converted into the proportional velocity The current measured value is an average of the individually transmitted sound
23. Operating instructions Acoustic digital current meter OTT ADC We reserve the right to make technical changes and improvements without notice Table of contents 2 3 10 11 12 13 14 Scope of supply Safety information Introduction 3 1 Measurement principle 3 2 Measurement process System components 4 Sensor 4 2 Handheld unit Starting up the OTT ADC 5 1 Ensuring power supply 5 2 Starting up the handheld unit 5 3 Starting up the sensor 5 4 Connecting the sensor to the handheld unit Preparing and carrying out discharge measurement 6 1 Preparing for measurement 6 2 Carrying out measurement 6 3 Transferring data to the PC Menu functions on the handheld unit 7 1 Main menu 7 2 Discharge measuring menu 7 3 Depth calibration menu 7 4 View data menu 7 5 Delete files menu 7 6 System status menu 7 7 System settings menu 7 8 Advanced menu Ensuring data quality 8 1 Angle of flow 8 2 Temperature compensation 8 3 Depth calibration 8 4 Internal quality check Processing data with OTT QReview 9 System requirements 9 2 Installing USB device drivers and software 9 3 Transferring data to the PC 9 4 Processing and exporting data 9 5 Menu functions in OTT QReview Maintenance work 10 1 Handheld unit 10 2 Sensor 50 Warnings and error messages 11 1 Warnings 11 2 Critical error messages Troubleshooting Technical Data Order numbe
24. a for the temperature sensor and the pressure cell of the relevant sensor Therefore only use a sensor and handheld unit with the same serial number and never exchange them between devices 4 1 Sensor The sensor is the base element of the OTT ADC The important necessary assem blies for measuring speed water depth and water temperature can be found in it It consists of the following components Sensor head with two integrated ultrasonic transducers temperature sensor and other assemblies Sensor body with integrated pressure cell and connector for the sensor connec tion cable Sensor end piece as adapter for the rod bracket with fixing sleeve for attach ment to the rods The serial number of the sensor is engraved into the rear part of the sensor body beneath the connection for the sensor connection cable Circular hole of Connector sensor end piece sensor connection cable Sensor head Fixing sleeve Pressure cell Temperature sensor chamber Ultrasonic transducers The sensor connection cable is fixed to the sensor body It is used to connect the sensor to the handheld unit for transmitting data and electrical power Fig 3 Connector for sensor connection cable Contact pins of connector Please note Never replace the sensor connection cable yourself For a professional replace ment of the sensor connection cable send the device to the OTT repair center if necessary 4 2 Hand
25. andheld unit of the OTT ADC Never use for other USB standard devices as differences in the output voltage will cause damage to the device Dispose of the OTT ADC properly after taking out of service Never dispose of the device in the normal household waste see Appendix F Note on the dis posal of old units Fig 1 OTT ADC with sensor and handheld unit to control the measurement and to receive the measurement results 3 Introduction The OTT ADC is a mobile acoustic current meter for measuring point velocities in open waterways It is used for discharge measuring with the classic verticals process with conventional rods During a discharge measurement the OTT ADC measures not only the vertical velocity distribution at the verticals but also the water depth and the respective depth of the sensor It calculates the average speed at the verticals from the mea surements and also the partial flow in a flow segment in accordance with Euro pean standard EN ISO 748 Finally it calculates the sum of all partial flows to determine the complete discharge 3 1 Measurement principle There are two ultrasonic transducers in the sensor head of the OTT ADC While measuring the flow velocity these transmit ultrasonic signals which are reflected by the waterway particles and return as echo signals The echo signals are received by the transducers and digitalized by a digital signal processor DSP as an echo
26. cessary for each measurement Details for near edge and far edge such as position water depth roughness and stream width Position of the first vertical and spacing of the verticals Planned sequence of the measurements at the verticals e g from bottom to top Rod offsets distances between rod base plate and waterway bed and between base plate and symmetry axis of the sensor Method of velocity measurement e g 2 point method or multi point measure ment Selection of the discharge calculation method MID or MEAN section Required measurement duration per measure point If necessary details of salt content of the water If basic settings already exist for the station concerned these can be loaded and used again It is also possible to load the data for a measurement already carried out and saved and to add further measure points See menu Main menu 1 2 Discharge Measuring Settings The measurement should also be named For this the following details are required File name to be used for saving the measurement data Name of the party See menu Main menu 1 2 Discharge Measuring Name or Party Fig 13 Positioning of the sensor in the water 6 2 3 Carrying out discharge measurement The sensor is only put into the water at the beginning of the discharge measure ment The depth of the sensor must be at least 2 cm The sensor is ideally positioned when the sensor head is pointing against the direction
27. cl operating manual available online USB driver for the connection between the handheld unit and the PC brief instructions for OTT ADC as PDF file operating instructions for OTT ADC as PDF file Acrobat Reader 2 Safety information Read these operating instructions through before using the OTT ADC for the first time Make sure you are familiar with the initial startup and operation of the device Retain these operating instructions for later reference The OTT ADC is used for discharge measuring in open waterways Only use the OTT ADC as described in these operating instructions During discharge measuring observe the accident prevention regulations applicable in your country Keep to the electrical and measurement specifications described in the technical data see Chapter 13 Technical Data Do not make any technical changes to the sensor or handheld unit of the OTT ADC and do not open the devices Otherwise you will lose all guarantee rights Carry out maintenance work as recommended and at regular intervals see Chapter 10 Maintenance work Have a defective device inspected and repaired by the OTT repair center Never carry out repairs yourself This also applies to replacing batteries and the sensor connection cable The handheld unit and sensor must have the same serial number in order to function correctly Therefore never use devices with differing serial numbers Only attach the power supply to the h
28. d with intelligent energy management A switched on device supplied by the batteries switches off automatically if no keys are pressed or no data communication takes place over a period of more than 15 minutes The background illumination is switched off as standard after 30 seconds without a key press However the automatic switching off of the background illumination can also be deactivated All data saved on the handheld unit are persistent and are also retained even with completely discharged batteries Please note Replacing the batteries installed is only possible by the OTT repair center see Appendix E Repair Charging batteries Required components handheld unit power supply with charging cable con nector and power supply cable with plug charging cable How to charge the batteries Connect the charging cable connector of the power supply to the charging cable with the barrel connector Connect the charging cable to the handheld unit via the USB connection Connect the mains plug of the power supply to the mains electricity supply The batteries are charged The display of the handheld unit is automatically switched on The charging process lasts around 2 hours It is possible to make entries via the handheld unit while it is being charged Note You can also charge the batteries using a vehicle voltage converter There is an optional adapter available for this see Chapter 14 Order numbers and acces sories Cautio
29. e a suitable message is displayed The handheld unit is auto matically switched off and put back into ready mode Please note During the upgrade process the handheld unit must not be switched off The on off switch of the handheld unit is therefore deactivated during the upgrade process Appendix D Standard settings Settings on the handheld unit Volume Contrast Background illumination Units Language Measured value display velocity Hours Minutes Seconds Year Month Day 10 8 Automatic Metric English Continuous 00 00 00 01 01 00 Standard settings for parameters for discharge measuring Stream width Near edge position Far edge position Position of first vertical Spacing of verticals Measure Order Sensor offset Point offset Roughness Correction factor ice 1 point measurement Correction factor ISO surface measurement Depth Measurement duration averaging time Salinity System constants Interval for calibrating the depth measurement Automatic background illumination length of inactivity until switching off Permitted number of failed measurements within a discharge measurement Permitted change in velocity between two measurements Minimum spacing of the measure points of a vertical with multi point measuring Minimum sensor depth Required correlation value Required SNR value Distance of vertical to edge Number of verticals Number of measure points per vertical 10 00 m
30. e respec tive verticals 35 36 Fig 16 Example for alternative displays during the measurement Measuring mode After you have confirmed the window Point i with Ok and continue the hand held unit changes to measuring mode Position the sensor at the preset depth Take note of the display symbols the OTT ADC shows the depth of the relevant mea suring point and whether the sensor is already at the correct position see Chapter 4 2 1 Display screen Alternatively you can change the display view to call fur ther information e g on water temperature and SNR value measure of the validi ty of the measured values see Chapter 8 4 Internal quality check uil B SEE gt 0 95 0 85 0 85ms 15 5 0C 10 95 SNR40dB 10 07 1 00 E N ER ET EX Start the measurement with key The measurement runs for the set amount of time At the end of the measurement the results are shown in a subsequent win dow You can reject this measurement and repeat it or accept the measurement results and continue with the next measure point Once all measure points for a vertical have been processed the subsequent screen Completed is shown Note If the sensor is not positioned at the specified measure point you receive the warning message Wrong depth after starting the measurement If you still want to position the sensor at a depth other than that specified continue as follows Cancel the
31. een Saved data and current information on the measurement running are shown on the graphical user interface of the display Data quality display Measurement NN iul Bl Battery charge state progress indicator Submersion depth set value Flow velocity 0 8 5 0 957 Distance of W v verticals E B M from reference point zx El Function display for operating buttons Position of the sensor on the vertical Position of the verticals Units Water and sensor depth as well as various positions and distances are shown in separate displays on the handheld unit without units Depths and distances are measured in meters m or feet ft The unit is specified when the handheld unit is set see Chapter 5 2 1 Setting the handheld unit 4 2 2 Display symbols Display symbols provide information on the system status and the current mea surement In the course of the discharge measurement being run they also give information to the user on the correct positioning of the sensor Distance of verticals Battery charging state gt from cross section zero y ging point alll Data quality display v Position of vertical Measurement progress indi Position of sensor on the cator vertical actual value Water t h Position of sensor on ZE femperdture vertical set value Depth of the sensor actual Battery power supply l value Note Leave sensor at cur V Flow velocity rent positi
32. elow An exact description of the individual menu functions can be found in the online operating instructions for OTT QReview Help menu Using the File menu open a new file or print out a file already open In the Edit menu you can adapt the measurement data and recalculate it e g you can change the calculation method In the Settings menu you specify certain calculation parameters e g a value that influences the calculation of the average flow velocity PowerLaw or the unit to be used In the Settings menu select the software language With the Tools menu you can carry out a PowerLaw analysis and thus represent the relationship of the average flow velocity to the waterway depth In this menu you can also start the upgrade of the user firmware for the hand held unit see Appendix C Firmware upgrade The ADC menu is used for transferring of measurement data from the handheld unit to the PC see Chapter 9 3 Transferring data to the PC The Export menu offers an open interface for the export of data in various for mats txt XML depth list so that the data are also accessible to other evalua tion programs e g for BIBER SoftwareQ or Excel The Help menu provides information on the software used e g the current ver sion of OTT QReview Here you can also find the online operating instructions 49 10 Maintenance work The high quality design of the OTT ADC makes only a little maintenance work necessary 1
33. end piece Push the sensor with the circular hole of the sensor end piece mechanical adapter over the rod Ensure the sensor connection cable is pointing upward Position the sensor at the required point on the rod Tighten the fixing sleeve of the sensor end piece until the sensor is fixed Extend the rod as required Fixing sleeve 02 D Cl Eti How to position the sensor on the rod To move the sensor to a different position on the rod during a measurement it has to be lifted out of the water Unscrew the fixing sleeve of the sensor end piece Move the sensor and fix at the new position with the fixing sleeve 17 18 Fig 10 Attachment of the sensor to the OTT HERES 5 3 2 Fixing and positioning the sensor on the rod with the OTT HERES top setting wading rod When using the OTT HERES top setting wading rod the sensor is attached to the top setting wading rod using the HERES adapter Required components OTT ADC sensor OTT HERES top setting wading rod starting piece 20 mm diameter rod extension for rod and OTT HERES if necessary How to attach the sensor to the OTT HERES Unscrew the fixing sleeve off the sensor end piece Loosen the Allen screw on the HERES adapter Push the sensor end piece onto the receiver provided on the HERES adapter and fix with the Allen screw Ensure the sensor connection cable is pointing upward towards the rod Slide the starting
34. ength Weight in air Weight in water Handheld unit Weight Dimensions L x W x H Material Sensor housing Screws Handheld unit Keyboard IP protection class Handheld unit Plug connected Plug not connected Sensor except for the plug 0 2 m s to 42 4 m s 1 926 of the measured value 0 25 cm s 0 001 m s 10 cm 1 cm per sound pulse 5 cm 6 MHz 5 0 1 FS 0 01 FS 1 5 times the measuring range 5 C to 35 C 0 5 0 1 C O ppt to 50 ppt mg l fixed battery pack NiMH 9 6 VDC typically gt 14 hours gt 5007 18 VDC 1A 20 C to 60 C 40 C to 85 C compatible with EN 60068 2 32 40 mm 14 5 cm 800 g 620g 700 g 23 3 cm x 8 3 cm x 3 2 cm Delrin stainless steel stainless steel aluminium powder coated Autotex V 150 XI IP65 IP 40 IP 68 1 battery life which can be actually achieved depends on environmental conditions and on the number of charging cycles completed 2 the number of charging cycles depends on the application environmental conditions and other factors 3 for the sensor connection cable Internal data memory Capacity Ultrasonic transducers Frequency Beam angle OTT QReview software Operating system Functionality EN 61000 6 2 2001 EN 61000 6 4 2001 FCC Part 15 subpart B Section 145109 EMC Directive 89 336 EEC Article 4 EMC Directive 2004 108 EU Article 5 A MB flash 6 MHz 20 Windows 98 Wind
35. epeat it or confirm it and continue with the next measure point Once the measure points for all verticals have been processed an appropriate message is shown If necessary you can modify the edge parameters retrospectively After wards the handheld unit shows the calculated complete discharge If required you can can still call details of the partial discharges for the individual verticals and then end the measurement See menu Discharge Measuring Start Notes All relevant data for a discharge measurement are automatically saved on the handheld unit You can interrupt a measurement already started To do so switch off the hand held unit When next switched on the measurement will be continued Please note As soon as the point Start in the Discharge Measuring menu is selected you are led through the measurement by the user interface of the handheld unit Familiar ize yourself with the display symbols so that you will correctly interpret the graphi cal information see Chapter 4 2 2 Display symbols Canceling measurement measurement already started can be canceled as soon as the operating key function for Call Main Menu is active in the respective operating situation Call main menu and move to Main Menu 1 2 if necessary Select menu point Discharge Select END Navigate through the subsequent windows until the Return operating key function is active Press several times as necessary on Return opera
36. erway width Please note the minimum waterway width to use an OTT ADC 0 5 m Specify the verticals The number and position of the verticals are dependent on the geometric shape of the measurement cross section and the intended measurement and evaluation method The following rules apply according to EN ISO 748 Waterway width Number of verticals inm 0 and 0 5 gt 0 5 and lt 1 gt land lt 3 gt lt 5 0 gt 5 and lt 10 10 20 gt 10 gt 20 Om R C 4 5 8 The distances between verticals are generally smaller where water depth and flow velocities change significantly This affects above all the bank areas vertical or steep slopes ledges in divided cross sections and transitions from the main water way bed to the foreland Verticals should also be located at significant changes in the profile of the waterway bed With consistent bed gradient of the waterway there is the possibility to reduce the number of verticals and to space them evenly without being in conflict with the above requirements European standard EN ISO 748 recommends selecting verticals in such a way that with large waterways a discharge segment defined by the vertical s repre sents less than 5 of the complete discharge where possible and a maximum of 10 A sufficient number of verticals is thus a prerequisite With discharge measuring with the OTT ADC you can check the percentage pro portion of the complete discharge f
37. h Roughness Stream width Position of the far edge m Value gt 0 The value is equal to the distance of the far edge from the reference point Value range gt 0 00 300 00 Entry format numerical Note The distance between near and far edge must be at least 0 5 m Water depth at the far edge m Value for natural waterways Value gt 0 for right angled cross sections Value range 0 00 10 00 Entry format numerical Roughness factor of the side wall The roughness factor is only relevant for right angled cross sections For these it is used as an influencing factor when calculating the dis charge proportion of the edge areas Value range 0 00 1 00 0 00 very rough 1 00 smooth Entry format numerical Width of the water surface from the left to the right edge m Corresponds to the value for stream width in subsequent window Near Edge and is automat ically adapted there if the stream width is changed here If required the edge parameters can be changed retrospectively at the end of a measurement Verticals Enter position and spacing of the verticals and the measurement sequence Subsequent window Discharge Measuring Settings Discharge 1 3 Verticals First pos Spacing Measure Order Rod Offsets Distance of the first vertical from the reference point m Value range 0 00 300 00 Entry format numerical Distance between the verticals m Value range 0 0
38. h and the USB connection to the PC M 0 E ADC USB connection On off switch Sensor connection Please note Cover the USB connection as soon as it is no longer needed for connecting to the PC For this use the protective cover supplied The sealing of the handheld unit is only ensured in this way Protect the socket of the sensor connection from damp and dirt 13 14 5 Starting up the ADC Before you can carry out a measurement with the OTT ADC you have to prepare the unit for the measuring process This includes Ensuring the power supply Setting the handheld unit according to requirements Attaching the sensor to the measuring rod Attaching the handheld unit to the measuring rod Connecting the sensor to the handheld unit 5 1 Ensuring power supply The power supply for the handheld unit and sensor is provided by rechargeable batteries which are permanently installed in the handheld unit The charging state of the battery is shown by the filled amount of the battery sym bol in the upper right corner of the display You can also query the charging state via the menu of the handheld unit See menu Main menu 2 2 System Status Battery With fully charged batteries operation for more than 20 hours measuring opera tion is possible Empty batteries can be charged more than 500 times The charg ing time with completely discharged batteries is approx 2 hours The handheld unit is equippe
39. held unit In order for the handheld unit to be recognized as a USB device two components have to be installed on the PC USB driver Serial driver virtual COM port The following steps describe the driver installation using the automatic hardware recognition in Windows XP The sequence of steps and window content can vary slightly for other Windows versions Place the CD supplied in the CD drive of the PC Connect the handheld unit to the PC via the USB connection Use the USB cable supplied for this Switch on the handheld unit The Add Hardware Wizard opens In the Welcome window answer the question whether a connection should be made to Windows Update with No not this time Click on Next In the next window answer the question How do you want to proceed with Install software from a list or a particular source for advanced users Click on Next In the next window select the following options Search this source for the most suitable driver Search floppy disk CD Click on Next Ignore the subsequent warning message Windows Logo Test not passed and click on Continue installation The USB driver is installed In the next window click on Finish to complete the installation After successfully installing the USB driver the Add Hardware Wizard is restarted as the serial driver for the USB device has not yet been installed The installation of the serial driver is carried out in the same way It star
40. held unit The handheld unit is the interface between user and sensor The user enters the necessary parameters for the station and measuring method with the handheld unit The graphical user interface of the unit leads the user through the measure ment and provides measurement information The handheld unit consists of the following components Digital board for processing the signals received CPU board for data processing and output Fixed battery pack rechargeable battery for electrical supply Charging unit Display Keyboard Loudspeaker for key and feedback signals Interfaces for communication with the sensor and for data transfer to the PC On off switch Please note The serial number is printed on the type plate on the rear of the handheld unit You can also query the serial number via the menu of the handheld unit See menu Main menu 2 2 System Status Serial Nr 10 Fig 4 Handheld unit with display operating keys and keyboard The following figure shows components that are important for working with the handheld unit LC Display Operating keys op Up ES N w J K 5 z 2 Keyboard PQRS e lt S Oz N go A E gt g USB interface for connection to the PC On off switch Sensor connection Fig 5 Display screen during the measurement example 4 2 1 Display scr
41. in clear water for a few minutes until all encrustation is dissolved Store the sensor in the transport case supplied when it is not in use In this way the device is protected from dust damp and contamination 11 Warnings and error messages During a measurement you may see warning messages or error messages on the display of the handheld unit The messages and their meaning are listed below 11 1 Warnings Stream width is incorrect Check Edges The distance between near and far edges is too small It must be at least 0 5 m gt Change the position of the near and far edges as appropriate Discharge Measuring Settings Discharge 1 3 Near Edge or Far Edge This file already exists Press 1 to overwrite The file name given already exists gt Press key 1 to overwrite the file deletes the existing data or allocate a new file name Cannot calculate Nr of verticals Spacing 0 The user has given the value for the distance between verticals The OTT ADC cannot therefore calculate the overall number of verticals in the measurement cross section gt Enter a spacing value gt 0 Discharge Measuring Settings Discharge 1 3 Verticals Spacing Position is beyond edge The position of the verticals lies outside the area defined by the near and far edges gt Check the near and far edges and adjust the position of the verticals appropriately Discharge Measuring Settings Discharge 1 3 Verticals Position or
42. jurod ejBuic eo 10 juo eje1 jurodiunw eopjang OS juiod omy a jurod o uouoes NY3W Buis pouilew 100 z eB1ouosiq 4 snoad p Aquo E SIesuyO pod 9Bp3 104 1 eBuoupsiq 95x 1 au JPA 1 o mee uoupJqio uideq sBuiyas Buunspew sine oq uideq eBuotpsiq c 1 nuaw UIDW 71 H 2 Main menu part 2 Main Menu 2 2 1 Delete files 72 System information 2 System Status gt System Info Free Memory Battery Serial Nr Fw Firmware version em Display 1 Backlight Sound level lees 2 Contrast 3 Velocity display 1 English 4 Spanish 2 Sound ON OFF 4 Fomat Recorder E Result only Document number 10 500 001 B E 05 0213 OTT Hydromet GmbH Ludwigstrasse 16 87437 Kempten Germany Tel 49 831 5617 0 Fax 49 831 5617 209 infoGott com www ott com
43. ked with the symbol shown aside For further information on the return procedure please contact your local sales contact You will find the address of the sales partners in the internet on www ott com Please take into consideration also the national implementation of the EU guideline 2002 96 EC of your country For all other countries Dispose of the OTT ADC properly after taking out of service Observe the regulations valid in your country for the disposal of electronic devices Never put the OTT ADC into the normal household waste Materials used See Chapter 13 Technical data 69 Appendix Declaration of conformity OTT EE Konformitatserklarung Declaration of Conformity Declaration de Conformit Wir Wei Nous OTT Messtechnik GmbH amp Co KG Anschrift Address Adresse LudwigstraBe 16 D 87437 Kempten erkl ren da das Produkt declare that the product declarons que le produit Bezeichnung Name Nom OTT ADC Artikel Nr Article No No d Article 10 500 001 9 0X X 10 500 002 9 0X X mit den Anforderungen der Normen fulfills the requirements of the standard satisfait aux exigences des normes EG 2004 108 EG St raussendung emission mission national international EN 61000 6 4 TEC 61000 6 4 Klasse class classe A class classe A FCC Part 15 St rfestigkeit noise immunity immunit national international EN 61000 6 2 TEC 61000 6 2 EN 61000 4 2 IEC 61000 4 2 EN 61000
44. l number important if there are several OTT ADC devices available Measuring rods and top setting wading rods to be used must be available in sufficient number and be able to be connected without problem Aids for setting up the station must be ready e g measuring rope or tape mea sure pegs sledge hammer sickle etc Functional protective clothing should be available waders rubber boots waterproof clothing etc 6 1 2 Setting up the station The area of use of the OTT ADC attached to the rod is limited by the effort needed from the user to hold the sensor against the pressure of the flow The effort is mainly dependent on the flow velocity of the waterway and the length of the lever Setting up the measurement cross section The correct selection of the measurement cross section is significant for the quality of the measurement Hydraulically suitable stations can be found in a straight length of waterway with regular cross sections and as consistent a bed gradient as possible Measurement cross sections with still areas counter or eddy currents should be avoided Equally unsuitable are stations in deep pools below large inflows in the vicinity of ship moorings ferries and sluices The measurement cross section is set at right angles to the main flow direction For this a tape measure or a measuring rope is used for example Ensure that the tape or measuring rope is faut Tab Number of verticals in relation to the wat
45. n The power supply has been specially developed for the OTT ADC The power sup ply may not be used for other devices that correspond to the USB standard as dif ferences in the output voltage can lead to damage to the device 5 2 Starting up the handheld unit Before you start using the handheld unit ensure that the batteries are charged Switching the handheld unit on off Press on off switch for approx one second The startup process takes approx 10 seconds It is finished when the at the upper edge of the display disappears 5 2 1 Setting the handheld unit You can adapt the settings of the handheld unit according to your individual wish es Menus that contain the parameters for individual settings can be found in the main menu See menu Main Menu 2 2 The following menus are relevant System Settings System Menu Here you can set the date and time control the display screen and change the volume for key and feedback sounds Advanced Advanced Here you can set the display language specify whether the key sounds are switched on and specify the unit of measurement to be used on the display and for calculations metric imperial Further information on the individual parameters and options of the relevant menus can be found in Chapter 7 Menu functions on the handheld unit 15 16 Fig 8 Attachment of the handheld unit to the rod 5 2 2 Attaching the handheld unit to the measuring rod The OTT ADC is
46. n method The average flow velocity is calculated according to the following rule WT V c V p V c V NU V Vi xh V V x he V V x h 2h A 2 Overview Methods of discharge calculation The calculation of the discharge can be done with either graphical or arithmetic methods The graphical methods require large amounts of processing power and are therefore supported by conventional evaluation programs for discharge vol umes e g SoftwareQ BIBER The OTT ADC supports the arithmetic calculation method according to EN ISO 748 MEAN section method procedure with average cross section With this method the measurement cross section is divided into individual flow segments Each partial segment is limited by two adjacent verticals 2 b t 9 b eh 1 x 4 ei 5 b 2 bh a b O _ E 1 2 3 A v h h2 Vua hg Yma ha Segment 23 4 gt V Vt V h h 3 4 e 61 62 Fig 21 MID section method The equation given describes the discharge calculation for an individual segment for the MEAN section method The total discharge is thus the sum of the partial discharges of all segments Comment The additional discharge element of the two edge segments is calculated with the assumption that speed and depth at the edges are zero M
47. nector see Chapter 4 1 The velocity measured seems unrealistic Ultrasonic transducers soiled or damaged gt Check the ultrasonic transducers for contamination for example by sand and for damage If necessary clean the transducer with an absorbent lint free cloth or a soft brush Sensor correctly aligned gt Align the sensor at right angles to the measurement cross section see Chapter 8 1 Ensure that the rod is held straight Obstruction in front of the sensor gt Remove the obstruction or select a different measuring position Data quality sufficient SNR gt 10 display symbol for data quality solid gt Choose a different measuring position if necessary The SNR value does not change or only little Sensor properly calibrated in the air gt Calibrate the pressure cell as described in Chapter 6 2 1 53 54 13 Technical data Velocity measurement Measuring range Accuracy Resolution Measured volumes Distance from sensor Diameter Length Acoustic frequency ultrasonic transducer Depth measurement Piezoresistive pressure cell absolute Measuring range Accuracy Resolution Max overload Temperature measurement Measuring range Accuracy Resolution Salinity Range Power supply Type Nominal voltage Life Charging cycles Output voltage current of power supply Operating conditions Operating temperature range Storage temperature range Shock resistance Dimensions and weight Cylindrical sensor body L
48. oint of a measured dis charge cross section Value gt if the near edge is not the reference point The value is then equal to the distance of the near edge from the reference point Value Range 0 00 300 00 Entry format numerical Water depth at the near edge m Value for natural waterways Value gt 0 for right angled cross sections Value range 0 00 10 00 Entry format numerical Roughness factor of the side wall The roughness factor is only relevant for right angled cross sections For these it is used as an influencing factor when calculating the dis charge proportion of the edge areas Value range 0 00 1 00 0 00 very rough 1 00 smooth Entry format numerical Width of the water surface from the left to the right edge m Corresponds to the value for stream width in subsequent window Far Edge and is automati cally adapted there if the stream width is changed here Value range gt 0 50 300 00 Entry format numerical The values for position near far edge and stream width are dependent on each other If the value for position is changed to a value gt O a value previously set for stream width is automatically adapted to this value 29 30 Far Edge Enter parameters for the far edge For definition see Near Edge The far edge is on the side where the measure ment is ended Subsequent window Discharge Measuring Settings Discharge 1 3 Far Edge Note Position Dept
49. on Checking the COM port How to transfer data to the PC Connect the handheld unit to the PC via the USB connection Use the USB cable supplied for this Switch on the handheld unit Start the OTT QReview application double click on QReview exe Select ADC tab and click on Connect f necessary check which COM port the handheld unit is available on In the subsequent window select the relevant COM port from the drop down menu and click on Connect The files are displayed in the the area Files on ADC in the Connect window To save the files on the PC proceed as described below Highlight the files required Under Files on desktop select a directory where the files are to be stored Click on the Retrieve files button The selected files are saved in the relevant directory on the PC If no further files are to be saved you can close the Connect window 9 4 Processing and exporting data In order to be able to process an ADC file saved on the PC with OTT QReview you first have to open it Select File open in the main window of OTT QReview In the subsequent window select the required file from the relevant directory mark it and confirm with ok In the Graphics tab the measurement data for the selected file are shown graphi cally and in the Data tab they are listed 9 5 Menu functions in QReview You can edit the measured data print it or export it For this there are various menus available described briefly b
50. on depth 1 Note Position sensor fur No signal blinks A V ther up down 11 12 4 2 3 Operating keys With the help of the operating keys you can control the menu sequence or delete existing characters in the input masks The function of the oper ating keys depends on the current operating situation It is shown directly above the respective key in the display Call main menu Return to previous menu Delete character Ok and continue lin entry masks 4 Confirm entr in input mol Move up down in multipart menus and lists Call help Switch between two views A Starting measurement on a display m d RBS 4 2 4 Character entry Characters e g file names are entered in special input masks via the keyboard of the handheld unit Depending on the operational situation the entry of numbers numerical values or text alphanumeric values is possible in the individual entry mask Numerical values and press relevant key once Alphanumeric values press relevant key 1x 2x 3x or 4x until the required character is shown in the display Fig 6 E le of an input z ig E Discharge Measuring entering file name Filename EIE ES KE SS Fig 7 Interfaces and on off switch on handheld unit 4 2 5 Interfaces and switches on the handheld unit On the underside of the handheld unit there is a socket for the sensor connection the on off switc
51. or each segment This is automatically calculat ed and shown on the display of the handheld unit at the end of the measurement See menu Main menu 1 2 Discharge Measuring Start Completed Discharge Measur ing Details 6 2 Carrying out measurement Requirements The measuring equipment is complete and functioning the station is set up sensor and as required handheld unit are attached to the rod the sensor is connected to the handheld unit 6 2 1 Depth calibration To determine the water and sensor depths an absolute pressure cell is built into the sensor body of the OTT ADC To ensure correct measurement values the pres sure cell must be calibrated under the currently existing air pressure conditions 23 24 Please note The sensor must be outside the water during calibration A first calibration is started before beginning the measurement with the help of the handheld unit During the measurement you are requested every 30 minutes to repeat the calibration via the user interface of the handheld unit See menu Main Menu 1 2 Depth Calibration 6 2 2 Making basic settings to the discharge measurement In order to lead the user through the discharge measurement and for the subse quent determination of the discharge the OTT ADC firstly needs basic data for the respective station These data basic settings are entered via the handheld unit before beginning the measurement The following basic settings are ne
52. ows ME Windows NT Windows 2000 WindowsXP Windows Vista Data transfer from handheld unit Data check and processing Data export XML ASCII 55 56 14 Order numbers and accessories OTT ADC acoustic digital current meter Versions available with version code with 2 5 m connection cable and adapter for 20 mm rods with 6 m connection cable and adapter for 20 mm rods with 10 m connection cable and adapter for 20 mm rods with 2 5 m connection cable and adapter for rod type USGS with 6 m connection cable and adapter for rod type USGS with 10 m connection cable and adapter for rod type USGS OTT ADC accessories Power supply with AC DC converter Universal power adapter set for power supply Charging cable Adapter for 12 V vehicle connection Universal attachment for handheld unit USB connection cable for PC connection Protective cover for handheld unit USB socket Bubble level Rod accessories Rod 20 mm with base plate and point Division into dm 2 m long 2 part 3 m long 3 part 4 m long 4 part 5 m long 5 part 6 m long 6 part Division into cm 2 m long 2 part 3 m long 3 part 4 m long 4 part 5 m long 5 part 6 m long 6 part 10 500 001 9 0 10 500 420 9 5 97 850 022 9 5 10 500 428 9 5 97 850 025 9 5 10 500 057 9 5 97 120 337 9 5 10 500 425 9 5 99 960 003 9 5 16 000 126 9 2 16 000 128 9 2 16 000 129 9 2 16 000 130 9 2 16 000 131 9 2 16 00
53. pattern After a short pause the process is repeated so that there is a sec ond echo pattern The DSP checks both echo patterns for similarity using a mathe matical procedure and calculates their time difference The difference is then used to calculate the flow velocity 3 2 Measurement process Before beginning the measurement the user enters the relevant parameters for the specific station and the required measuring and calculation methods via the hand held unit During the measurement the graphical user interface on the handheld unit leads the user step by step from the first to the last measure point In the process the communication between the handheld unit and the sensor is via the sensor con nection cable Relevant parameters and measurement results for a station are saved in a specific file in the handheld unit After the measurement the user can load the data onto the PC prepare and process it using the processing software OTT QReview Fig 2 Components of the sensor 4 System components The OTT ADC mainly consists of the following components Sensor Handheld unit Further components are for example an adapter for connecting the handheld unit and sensor to the measuring rod the power supply a charging cable and connec tion cables for connecting the handheld unit to the sensor and PC Please note The serial numbers of the sensor and handheld unit must correspond The hand held unit contains calibration dat
54. piece of the OTT HERES onto the rod with the sensor mounted Extend the rod and OTT HERES as required OTT HERES starting piece HERES adapter dE Li Allen screw How to position the sensor with the OTT HERES Using the OTT HERES top setting wading rod which is pushed over the rod as a sleeve the sensor can be repositioned without lifting it out of the water Loosen the fixing screw of the OTT HERES top setting wading rod Move the sensor with the OTT HERES and fix at the new position with the fixing screw 5 3 3 Fixing and positioning the sensor to rods of type USGS Required components OTT ADC sensor with sensor end piece as mechanical adapter for rod type USGS rod of type USGS with appropriate meter sensor bracket extensions for rod if necessary How to attach the sensor to the USGS rod Push the sensor with the circular cutout of the sensor end piece mechanical adapter onto the receiver provided on the meter sensor bracket of the rod Ensure the sensor connection cable is pointing upward Press the sensor as far as it goes Fix the sensor with the fixing screw of the mechanical adapter Position the sensor at the required point on the rod see below Extend the rod as required Fig 11 Attachment of the ADC sensor to rods of type USGS Sr 7 Sensor end piece Meter sensor bracket How
55. prox 30 seconds no entry has been made or no data communication has taken place The display illumination is switched off Setting the display contrast Value Range 1 10 1 low contrast 10 high contrast Specily the frequency of the measured value display Subsequent window Velocity display The current setting is marked with Continuous Result only The measurement results for flow velocity mea surement are continuously displayed and updated every second Note The continuous display allows a visual impres sion of the turbulence of the flowing waterway Only the end result of the flow velocity mea surement is displayed Subsequent window System Settings System Menu Sound level Sound level Sets the volume for key clicks and feedback sounds Value Range 0 10 0 no sound 10 loud 41 42 7 8 Advanced menu Use this menu to call the Advanced sub menu where you can make further set tings for the handheld unit clear the memory or carry out a reset Sub menu Advanced Advanced Language Key Sound Units Format Recorder Reset Select display language Switch key sounds on off The current setting is shown on the display ON or OFF Select units Format recorder After calling Format Recorder a warning mes sage appears After confirming the message all files saved on the handheld unit are deleted Carry out reset After calling Reset a warning message appears After
56. receive the message DISCHARGE MEASUREMENT COMPLETED This is followed by the win dow for setting the edge parameters in which you can change these parameters if necessary This can be particularly necessary for the far edge parameters as they may only be clearly ascertained at the end of the measurement See menu Discharge Measuring Settings Discharge 1 3 Near Edge or Far Edge Subsequent window Discharge Measuring START Completed Next vertical Completed Edges Discharge Measurement Name File name of the discharge measurement Discharge Calculated total discharge m3 s Details Details of the discharge measurement Subsequent window File name Discharge Calculated total discharge m3 s Avg Velocity Average flow velocity m s Avg Depth Average water depth m Area Size of the measurement cross section m2 Scrolling with the operating keys and opens the detail windows for the individual verticals Subsequent window Vertical nr i x The percentage value x shows what proportion of the total discharge is rep resented by the partial discharge of the vertical i Position Distance of the respective vertical from the ref erence point m Discharge Partial discharge represented by vertical i m3 s Avg Velocity Average flow velocity at vertical i m s Depth Water depth at vertical i m Area Cross section of the measured discharge seg ment represented by vertical i m2 s 37 38 End
57. rnal quality check for flow velocity measurement is based on the parameters in the following table Parameters Description Comment SNR SNR Signal Noise Ratio Limit SNR 10 db Indicator for the strength of the reflections caused by ihe particles in the water If the SNR value is too low a valid measurement is not possible CF CF correlation factor Limit CF gt 40 Indicator for the consistency of sequentially received scan patterns Peaks Outliers in measured values caused see Comment by environmental conditions oV Standard deviation for the velocity see Comment B Indicator for the measurement accuracy Takes account of water turbulence and internal measuring errors Percentage proportion of a dis EN ISO 748 2000 charge segment to the total ds lt 5 ideal charge XQ lt 10 max see Comment C Comment A peaks Peaks are eliminated in the check of the velocity gradient Comment B standard deviation The standard deviation is decisive for the determination of the valid measuring range Comment C segment proportion of total discharge After a completed measurement the percentage proportion of each segment of the total discharge is shown on the display of the handheld unit The user can then decide whether additional verticals should be allocated see recommendations in ISO standard Notes The SNR value can be viewed in the measuring mode by changing to the alter native display
58. rs and accessories Appendix A Theory and practical suggestions for discharge measuring with the OTT ADC A 1 Overview Methods for velocity measurement A 2 Overview Methods of discharge calculation Appendix B Flow velocity measurement with the OTT ADC functional principle Appendix C Firmware upgrade Appendix D Standard settings Appendix E Repair Appendix F Note on the disposal of old units Appendix G Declaration of conformity Appendix H Overview main menu H 1 Main menu port 1 H 2 Main menu part 2 58 58 61 64 65 67 68 69 70 71 71 72 1 Scope of supply OTT ADC 1 acoustic digital current meter consisting of sensor with sensor connection cable and mechanical adapter to attach the sensor to the measuring rod handheld unit with integrated battery and charging unit rod bracket for attaching the handheld unit to measuring rods universal attachment power supply with AC DC converter and connection for charging cable charging cable power cable for power supply USB cable for connecting the handheld unit to the PC OTT ADC brief instructions transport case factory acceptance test certificate FAT Optional universal power adapter set for power supply travel plug Optional adapter for 12 V vehicle connection CD ROM 1 CD ROM with the following elements user firmware for the handheld unit processing software OTT QReview in
59. rtical If required the values displayed can be modified the current water level entered and measure ments of any obstructions entered Position Depth Gauge Define obstruction Distance of the vertical i from the reference point m The position can be modified in the subsequent entry window Value Range 0 00 300 00 Entry format numerical Water depth at the vertical The current value can be confirmed or modified in the subsequent window see subsequent win dow Discharge START Start Measuring Point sti Water depth Current gauge level The gauge level can be entered changed in the subsequent entry window Entry format numerical Enter definition of any obstructions in the mea surement cross section An obstruction is for example a bridge pier Subsequent window Discharge Measuring START Vertical i Define obstruction Note First edge Last edge Width Distance of the side of the obstruction facing the near edge from the reference point Value Range 0 00 Stream width Entry format numerical Distance of the side of the obstruction facing the far edge from the reference point Value Range 0 00 Stream width Entry format numerical Width of the obstruction m Value range 0 00 300 Entry format numerical 15 automatically calculated if the edge values are already available If an obstruction is defined the OTT ADC recalculates the position of th
60. see Chapter 7 2 Section Measuring mode The correlation is shown in the measuring mode with a display symbol data quality display Each solid vertical bar represents a correlation factor of 20 If all five bars are solid the correlation is between 80 and 100 The continuous display of the flow velocity on the handheld unit screen gives a visual impression of the waterway turbulence See menu Main menu 2 2 System Settings System Menu Display Velocity display 45 46 9 Processing data with QReview To give a clear representation of your data on a PC and for subsequent analysis the OTT QReview software is supplied Using OTT QReview you can transfer your measured data directly from the handheld unit to a PC 9 1 System requirements IBM compatible standard PC notebook desktop from 233 MHz processor Operating system MS Windows 98 or higher 64 MB RAM 10 MB free space on hard drive Monitor with at least 800 x 600 pixel resolution recommended gt 768 pixel USB connection 9 2 Installing USB device drivers and software USB drivers for the handheld unit and the software components for OTT QReview can be found on the CD supplied The drivers for the handheld unit are in the directory PC Software USB Driver OTT QReview components are in the directory PC Software GhReview xxx version identification Software updates can be found at www ott com 9 2 1 How to install the drivers for the hand
61. specified and the salinity of the waterway if appropriate Subsequent window Discharge Measuring Settings Discharge 1 3 Load Load basic settings from a saved file and use it or continue previous measurement Subsequent window Discharge Measuring Settings Discharge 1 3 Load Load settings only Continue a previous measurement Calls the list of saved files After selecting the file required the settings saved there are loaded They are now preset for the new mea surement and can be modified as necessary Calls the list of saved files After selecting the required file the settings saved there are loaded and the relevant measurement can have further measure points added Note To go to the measuring mode after selecting the required file press Return three times key Vertical and position of the next measure point are shown on the display Near edge Enter parameters for the near edge The near and far edges are the left and right edge points that limit and define the complete width of the water surface The near edge is on the side where the measurement is started from Subsequent window Discharge Measuring Settings Discharge 1 3 Near Edge Position Depth Roughness Stream width Note Position of the near edge Value 0 if the near edge corresponds to the reference point for calculating the position of the verticals As a rule the reference point is the cross section zero p
62. t An upgrade is possible with the OTT QReview processing software see Appendix C Firmware upgrade 7 7 System settings menu Use this menu to call the System Menu sub menu in which you set the parameters for the handheld unit Sub menu System settings System Menu Date and Time Setting date and time Display Set display and measured value display Sound level Set volume Subsequent window System Settings System Menu Date amp Time Input mask for time and date The date entry format is numerical and integer in each case Hour Current time Enter whole hours Value range 0 24 Minutes Current time Enter minutes Value range 0 60 Seconds Current time Enter seconds Value Range 0 60 Day Current date Enter day Value range 1 31 Month Current date Enter month Value range 1 12 Year Current date Enter year Value range 0 99 e g 08 for the year 2008 After confirming with Ok and continue your entries are displayed After renewed confirmation the date and time are saved in the handheld unit Example for output 14 22 32 13 11 08 Subsequent window System Settings System Menu Display Backlight Set display illumination on off Subsequent window Display Backlight The current setting is marked with On Automatic Off Contrast Velocity display The display remains illuminated until the hand held unit is switched off The illumination is automatically switched off if after ap
63. t window there are 11 methods available 1 point 2 point 3 point 4 point 5 point 6 point measurement 2 point Kreps method 2 Point Kreps 1 point ice measure ment Ice Single point 2 point ice measure ment Ice Two Point surface 1 point measure ment ISO surface multipoint measure ment Explanations of the individual methods for velocity measurement can be found in Appen dix A 1 Overview Methods for velocity mea surement Set the method for calculating the complete dis charge The currently set method is shown on the display The possibilities available are MID section or MEAN lt section Note Experience shows that the MID section method provides more exact results ISO 748 Correction factor for the 1 point ice measure ment and the surface 1 point measurement Can only be selected if under Measure method the Ice Single point or ISO surface method has been selected Value range 0 7 1 0 Entry format numerical Subsequent window Discharge Measuring Settings Discharge 3 3 Averaging Salinity Enter measuring time 5 The measuring time applies to all measure points The currently set measuring time is shown on the display Value range 1 480 Entry format numerical integer Note The length of the measuring time at a measure point should be at least 30 s It is generally set at between 30 s and 50 s Enter salinity ppt The currently set value is shown on the display The salini
64. th at the vertical m To measure the water depth the user lowers the sensor to the bottom and calls menu point Water Depth key 2 Subsequent window Discharge START Start Measuring Point i Water Depth Measured Sensor Depth Sensor offset Water Depth 2 point example End this vertical Notes Depth of the sensor m Distance between the symmetry axis of the sen sor and the waterway bed m The distance shown is dependent on the basic settings for the rod offset which are listed in the subsequent window and can be modified if necessary see also subsequent window Discharge Settings Discharge 1 3 Rod Off sets The water depth calculated from the sensor depth and sensor offset In the subsequent window it is possible to mod ify the calculated water depth Value range 0 0 10 0 Entry format numerical Currently set method for velocity measurement The method can be modified in the Measure method subsequent window End measurements for this vertical and contin ue with the next vertical The measurement of the water depth is necessary at every vertical It can also be carried out in the detail window Vertical i or Next vertical i If you modify the position of a vertical the OTT ADC calculates the positions of the following verticals based on this new position Detail window Discharge START Start Measuring Point i Vertical i This window summarizes the information on the respective ve
65. the pressure cell must be calibrated in the air before beginning the measurement see Chapter 6 2 1 Depth calibration An internal timer requests the user to recalibrate after 30 minutes In this way incorrect measurements caused by changes in air pressure are practically excluded 8 4 Internal quality check The internal quality check in the device is closely linked to the flow velocity mea suring process More details on this process can be found in Appendix B Each measured value is checked internally for adherence to the following criteria Correlation gt 40 Velocity gt 0 25 m s and lt 2 5 m s Velocity gradient lt 0 25 m s difference between current measurement and the previously measured velocity SNR gt 10 db Measured values that meet the criteria are saved If the measurement time inte gration time is set to 30 s for example the OTT ADC collects a maximum of 30 values for each sound pulse At the end of the measurement time the OTT ADC checks whether at least 50 of all measured values are valid If not the measure ment is rejected and the user requested to repeat the measurement If the measured values are confirmed the OTT ADC calculates the mean and stan dard deviation for the measured velocities in the cells closest to and furthest from the sensor Based on the result of the calculation the final velocity is determined and output Tab 2 Parameters for internal quality check The focus of the inte
66. the round rod and hold at new position Release pressure on the rubber stopper and lock 5 4 Connecting the sensor to the handheld unit To provide the sensor with electricity and allow communication with the handheld unit it has to be connected to the handheld unit Connect the sensor connection cable to the handheld unit Take care to note the markings gt on the plug and socket After switching on the handheld unit the OTT ADC is ready for measuring see Chapter 6 2 Carrying out measurement 21 22 6 Preparing and carrying out discharge measurement The following sections describe what you have to take note of before a discharge measurement with the OTT ADC and in which steps the actual measurement pro ceeds Explanations for the individual menus and sub menus can be found in Chapter 7 Menu functions on the handheld unit The brief instructions for the ADC show step by step with example illustrations how to use the OTT ADC menus during a discharge measurement 6 1 Preparing for measurement 6 1 1 Checking the measuring equipment Before going to the station you should collect the measuring equipment required and check its functionality Note the following points All components of the OTT ADC must be in perfect condition and be complete in the transport case The handheld unit must have sufficient battery capacity see Chapter 5 1 Ensuring power supply Handheld unit and sensor must have the same seria
67. ting key to reach rest mode 6 3 Transferring data to the PC The OTT GReview software is provided to clearly illustrate the data and for pro cessing the data Using OTT QReview the measurement data can be loaded onto the PC and processed further there see Chapter 9 Processing data with OTT QReview Fig 14 Display in rest mode Fig 15 Part 1 and part 2 of the main menu 7 Menu functions on the handheld unit If the sensor is out of the water after switching on the handheld unit the display starts in rest mode after a few seconds unless a previous measurement had been interrupted If the sensor is in the water the display changes to measuring mode see section Measuring mode 15 51 34 ll NH m s nos POOO We From the rest mode and depending on the operating situation from within certain menus and sub menus the main menu is called with the right side operating key Note The following description uses the unit for clarity for displaying distances depths speeds and discharge values e g m s If the appropriate setting is changed on the handheld unit the values shown are displayed with the respective values in ft 7 1 Main menu The main menu of the handheld unit is divided into two parts Main Menu 1 2 and Main Menu 2 2 Both parts include several menus that are also divided into sub menus and up to three subsequent windows Menus sub menus and subse quent windows are called
68. ts with the Welcome win dow After installing both components the handheld unit is available via the USB inter face as an additional COM port for the PC Note If the Add Hardware Wizard does not find a driver it may be necessary to give the directory where the drivers are saved using Browse Depending on the processor type in the PC various driver versions may be necessary for transmit ting data from the handheld unit to the PC which are saved in the following direc tories on the CD supplied Directory i386 for PCs with a Pentium processor Directory amd64 for PCs with an AMD processor Checking the COM port When transferring data from the handheld unit to the PC or for a firmware upgrade you may have to give the COM port the handheld unit uses to communi cate with The COM port can be found via the device manager of the operating system For example with Windows XP at Start Control Panel System Hardware Device Manager Ports COM and LPT OTT ADC COMx The COM port is only shown if the handheld unit is connected to the PC via the USB port and is switched on 9 2 2 How to install the sofrware Save QReview files from the relevant directory on the CD supplied onto the hard drive of the PC Start the application Double click on QReview exe 47 48 9 3 Transferring data to the Requirements Software and drivers are installed The COM port used for the handheld unit is known see Chapter 9 2 1 Secti
69. ty influences the speed of the sound and is used as a parameter in the velocity measurement In freshwater waterways this is generally O ppt Value range 0 50 Input format numerical integer Sub menu Discharge Measuring START In this sub menu the discharge measurement takes place If no name has been given in the basic settings the file name for the measurement is queried after call ing START The following two windows list the previously made basic settings for information purposes The Start measuring window shows the file name of the measurement the water way width the total number of verticals and the number of measure points After confirmation the subsequent window Point i is displayed The Discharge Details window shows the selected measuring method and calcula tion method 33 34 Subsequent window Discharge START Start Measuring Point i With this window you can run the measurement of the water depth at the verti cals The window also provides information on the position of the verticals and the selected measuring method which can also be modified as required Finally you can end the measurement at the respective vertical Vertical Position Water Depth Number of the vertical The first vertical has the number 1 Distance of the vertical from the reference point m The position can be modified in the following input window Value range 0 00 to 300 00 Input format numerical Water dep
70. warning message key In the subsequent entry window enter the required depth input format numerical value range 0 0 10 0 Continue the measurement Subsequent window Discharge START Start Measuring Point i Completed The measurement is completed for all measure points of a vertical You can con firm the information in this window and continue with the next vertical or you can reject the measurement for this vertical Vertical nr i Number of the respective vertical Position Distance of the vertical from the reference point m Avg Velocity Average flow velocity at the vertical m s Points Number of measure points that have been measured Subsequent window Discharge Measuring START Completed Next vertical i This window shows the position of the next vertical Here you can also measure the water depth enter the new gauge and define any obstructions The parame ters in this window are identical to the parameters in the detail window Vertical i See menu Discharge START Start Measuring Point sti Vertical i After you have confirmed the window Next vertical i the window for the next measure point is displayed This has the identical content to window Point 1 of the first measure point See menu Discharge START Start Measuring Point i After confirming with OK and continue the measurement for this measure point is started When the measure points of all verticals have been processed you

Operating instructions Acoustic, digital current meter OTT ADC

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