Operating instructions Acoustic, digital current meter OTT ADC h s i l g n E We reserve the right to make technical changes and improvements without notice. Table of contents 1 Scope of supply 5 2 Safety information 6 3 Introduction 7 3.1 Measurement principle 7 3.2 Measurement process 7 4 System components 8 4.1 Sensor 4.2 Handheld unit 9 5 Starting up the OTT ADC 14 5.1 Ensuring power supply 14 5.2 Starting up the handheld unit 15 5.3 Starting up the sensor 17 5.4 Connecting the sensor to the handheld unit 21 6 Preparing and carrying out discharge measurement 22 6.1 Preparing for measurement 22 6.2 Carrying out measurement 23 6.3 Transferring data to the PC 26 7 Menu functions on the handheld unit 27 7.1 Main menu 27 7.2 Discharge measuring menu 28 7.3 Depth calibration menu 38 7.4 View data menu 39 7.5 Delete files menu 39 7.6 System status menu 40 7.7 System settings menu 40 7.8 Advanced menu 42 8 Ensuring data quality 43 8.1 Angle of flow 43 8.2 Temperature compensation 44 8.3 Depth calibration 44 8.4 Internal quality check 44 9 Processing data with OTT QReview 46 9.1 System requirements 46 9.2 Installing USB device drivers and software 46 9.3 Transferring data to the PC 48 9.4 Processing and exporting data 48 9.5 Menu functions in OTT QReview 49 10 Maintenance work 50 10.1 Handheld unit 50 10.2 Sensor 50 11 Warnings and error messages 51 11.1 Warnings 51 11.2 Critical error messages 52 12 Troubleshooting 53 13 Technical Data 54 14 Order numbers and accessories 56 3 Appendix A – Theory and practical suggestions for discharge measuring with the OTT ADC 58 A.1 Overview: Methods for velocity measurement 58 A.2 Overview: Methods of discharge calculation 61 Appendix B – Flow velocity measurement with the OTT ADC (functional principle) 64 Appendix C – Firmware upgrade 65 Appendix D – Standard settings 67 Appendix E – Repair 68 Appendix F – Note on the disposal of old units 69 Appendix G– Declaration of conformity 70 Appendix H– Overview main menu 71 H.1 Main menu part 1 71 H.2 Main menu part 2 72 4 1 Scope of supply (cid:2) 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) (cid:2) CD ROM 1 CD-ROM with the following elements: – user firmware for the handheld unit – processing software OTT QReview incl. 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 5 2 Safety information (cid:2)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. (cid:2)The OTT ADC is used for discharge measuring in open waterways. Only use the OTT ADC as described in these operating instructions! (cid:2)During discharge measuring, observe the accident prevention regulations applicable in your country! (cid:2)Keep to the electrical and measurement specifications described in the technical data (see Chapter 13 "Technical Data")! (cid:2)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! (cid:2)Carry out maintenance work as recommended and at regular intervals (see Chapter 10 "Maintenance work"). (cid:2)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. (cid:2)The handheld unit and sensor must have the same serial number in order to function correctly. Therefore, never use devices with differing serial numbers. (cid:2)Only attach the power supply to the handheld unit of the OTT ADC. Never use for other USB standard devices, as differences in the output voltage will cause damage to the device! (cid:2)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"). 6 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. Fig. 1 OTT ADC with sensor and handheld unit to control the measurement and to receive the measurement results 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 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. 7 4 System components The OTT ADC mainly consists of the following components: (cid:2) Sensor (cid:2) 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 data 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: (cid:2) Sensor head with two integrated ultrasonic transducers, temperature sensor and other assemblies (cid:2) Sensor body with integrated pressure cell and connector for the sensor connec- tion cable (cid:2) 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 rearpart of the sensor body, beneath the connection for the sensor connection cable. Fig. 2: Components of the sensor Circular hole of Connector sensor end piece sensor connection cable Sensor head Fixing sleeve Pressure cell Temperature sensor chamber Ultrasonic transducers 8 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 Handheld 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: (cid:2) Digital board for processing the signals received (cid:2)CPU board for data processing and output (cid:2)Fixed battery pack (rechargeable battery) for electrical supply (cid:2)Charging unit (cid:2)Display (cid:2)Keyboard (cid:2)Loudspeaker for key and feedback signals (cid:2)Interfaces for communication with the sensor and for data transfer to the PC (cid:2)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. 9 The following figure shows components that are important for working with the handheld unit: Fig. 4: Handheld unit with display, operating keys and keyboard LC Display Operating keys Keyboard USB interface for connection to the PC On/off switch Sensor connection 10