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OTT SLD Series Quick Reference

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Summary of Contents for OTT SLD Series

  • Page 1 Quick Reference Side Looking Doppler OTT SLD...
  • Page 2 We reserve the right to make technical changes and improvements without notice.

  • Page 3: Table Of Contents

    Appendix B – SDI-12 commands and responses B.1 Basic commands B.2 Advanced commands Appendix C – OTT SLD and Modbus fieldbus protocol Appendix D – Representation of the accumulated discharge volumes D.1 Representation in SDI-12 protocol D.2 Representation in Modbus protocol Appendix E –...

  • Page 5: System Description

    1 System description During installation, the sensor is connected to the PC and parameterized using a serial interface (a). After completing the installation, serial communication is termi- nated. Thereafter, the sensor is controlled from the datalogger through SDI-12 or RS-422/RS-485 (b) (SDI-12 protocol). a) Sensor –...

  • Page 6: Parts Supplied/Components Of The Ott Sld

    2 Parts supplied/components of the OTT SLD Please check the contents of the shipping crate against the packing list supplied. The sensor specification may be obtained from the name plate. Basically, the OTT SLD scope of supply includes 3 items: Connection cable Sensor Operating software CD Fig.

  • Page 7: Preparing For Installation

    SDI-12 Data SDI-12 SDI-12 GND RS-232 Rx RS-232 RS-232 RS-232 Tx + Supply (typ. +12 V) Supply Shielding OTT SLD Fig. 5: RS-422 connection diagram. RS-422 Rx+ RS-422 RS-422 Rx– Not used RS-422 RS-422 Tx– RS-422 RS-422 Tx+ + Supply (typ. +12 V)

  • Page 8: Checking The Communication

    3.4 Programming the datalogger Configure your datalogger (refer to the netDL/OTT DuoSens Operating Instructions). In Appendix B, all SDI-12 commands of the OTT SLD are described. Make sure that the SDI-12 address of the datalogger matches the SDI-12 address of the OTT SLD.

  • Page 9: Installation

    4 Installation Please note: Install the OTT SLD in such a way that it will be immersed in water under any operating conditions. In case this cannot be ensured, provide suitable equipment for automatically disconnecting the operating voltage when the unit is "falling dry".

  • Page 10: Setting The Operating Parameters

    [s] + 5 s River bank Select the river bank side (in flow direction) at which the OTT SLD is installed: "Left" or "Right". The OTT SLD is designed to be installed at the right-hand bank side of a flowing water- way.
  • Page 11 In such a case, the OTT SLD will retain the previous measured value for an adjustable period of time.
  • Page 12 The speed of sound in water depends on its density. The density itself is influenced by the temperature and the salinity of the water. The OTT SLD calculates the flow velocity of a water body based on the speed of sound. There are two ways to do...
  • Page 13 File format: "*.XML". Please note: The k*A table created must match the cells used! When the OTT SLD e.g. uses the cell numbers 3 through 7 for discharge calculation, the k*A table must also have been created based on these cells.
  • Page 14 Using the settings made in this window, the OTT SLD calculates the discharge "Q" from the flow velocity measured as well as from the table values for water level and corrected areas (k*A) ("Q" calculation based on the index method). More- over, the OTT SLD uses the Q values calculated to determine an accumulated discharge value over a selectable period of time.

  • Page 15: Aligning The Sensor

    4.3 Aligning the sensor Attach the sensor to the bracket. Position the sensor in the water as desired. To check proper operation of the sensor, the sensor head must be within the water. The pressure cell requires a minimum water coverage of 15 cm. Ensure that there are no obstructions in the water that may affect sensor operation.
  • Page 16 (Tilt = Pitch + Roll Value range: ±25° (shown in gray, beyond this value, the OTT SLD will set bit 3/ bit 4 in status value to “1” Refer to “Level Check” window (“On-line” menu) in OTT EasyUse software Fig. 21: Pitch/Roll values when aligning the OTT SLD.

  • Page 17: Checking The Water Level

    4.4 Checking the water level The water level is determined by evaluating the runtime an acoustic signal takes from the sensor to the water surface and back. Runtime measurement is supported by a pressure sensor. Figure 20 shows the strength of the amplitude (green) and the quality (yellow) of the received (reflected) signal in the horizontal axis.
  • Page 18 Figure 23 shows a test that provides an optimum result. For both acoustic beams, the strength of the echo signal continuously decreases over the entire distance. The increase obtained in cell #5 is caused by reflections from the opposite bank. Therefore, only cells #1 through #4 should be used.

  • Page 19: Operation

    5 Operation After completing all tests to be done during installation, the sensor is ready for use. 5.1 Disconnecting the PC from the sensor Check whether the datalogger measurement interval is larger than the averaging interval of the flow or level measurements (for the formula, refer to Chapter 4.2). From the "Deployment"...

  • Page 20: Connection To Datalogger

    Please check it carefully. Use the "Confirm" button to confirm the configuration. Fig. 28: Confirming the deployment. Now you have successfully configured the OTT SLD. Use the "OK" button to disconnect the connection to the PC. Fig. 29: SDI-12 started.

  • Page 21: Verifying The Data

    3.2 (use a silicone spray)! 5.3 Verifying the data On the instantaneous value display of the OTT netDL/OTT DuoSens datalogger, the OTT SLD instantaneous values are shown. Please note the time offset caused by the configured intervals.

  • Page 22: Technical Data

    1 % of meas. value ±5 mm/s Resolution 1 mm/s Measurement averaging time 1 s … 3600 s Number of measuring cells OTT SLD 2.0 MHz OTT SLD 1.0 MHz OTT SLD 0.6 MHz Frequency 2 MHz 1 MHz 600 kHz Blanking 0.1 …...

  • Page 23: Information On Electromagnetic Compatibility

    Select "OK" to confirm the safety question ➝ The OTT SLD EasyUse software copies the new firmware into the OTT SLD. Note The settings saved in the OTT SLD are not lost after an update. However, the measured values recorded will be lost!

  • Page 24: Appendix B - Sdi-12 Commands And Responses

    Appendix B – SDI-12 Commands and Responses B.1 Basic commands All SDI-12 basic commands are implemented in the OTT SLD. The following SDI-12 basic commands are relevant to the operation of the OTT SLD: Conventions applicable to measure value formats: p –...
  • Page 25 Range: –6.00 … +40.00°C <value2> – Combined water coverage from pressure measure- ment and acoustic measurement (pressure measure- ment specifies the range in which the OTT SLD evalu- ates the acoustic measurement) [m] Measured value format: pb.eee Range: +0 … +9.999 m <value3>...
  • Page 26 – Sensor address – Time in seconds until the sensor has determined the measurement result. OTT SLD response = averaging times set (average interval) from "Flow" and "Level" + 5 seconds – Number of measured values OTT SLD response = 2 a<CR><LF>...
  • Page 27 Read accumulated discharge – Sensor address a<CR><LF> after 1 second – Time in seconds until the sensor provides the measurement result. OTT SLD response = 001 – Number of measured values OTT SLD response = 8 a<CR><LF> – Service request aD0! a<value1><value2><value3>…...
  • Page 28 Beam 1: Read signal amplitudes of the last measurement – Sensor address a<CR><LF> after 1 second – Time in seconds until the sensor has provided the result. OTT SLD response = 001 – Number of measured values OTT SLD response = 9 a<CR><LF> – Service request aD0! a<value1><value2><value3><CR><LF>...
  • Page 29 Read unfiltered velocity in y direction – Sensor address a<CR><LF> after 1 second – Time in seconds until the sensor has provided the result. OTT SLD response = 001 – Number of measured values OTT SLD response = 9 a<CR><LF> – Service request aD0! a<value1><value2><value3><CR><LF>...

  • Page 30: Advanced Commands

    For more information on the SDI-12 basic commands, please refer to the publication SDI-12; "A Serial-Digital Interface Standard for Microprocessor-Based Sensors; Version 1.2" (refer to the website "www.sdi-12.org"). B.2 Advanced SDI-12 commands There are no SDI-12 advanced commands implemented in the OTT SLD.

  • Page 31: Appendix C - Ott Sld And Modbus Fieldbus Protocol

    Appendix C – OTT SLD and Modbus fieldbus protocol Using a protocol converter, the OTT SLD may be connected to a fieldbus system featuring RS-485 interfaces and Modbus protocol. For this purpose, OTT offer the UNIGATE CL-RS protocol converter as an accessory, which provides the necessary ®...
  • Page 32 Installing the UNIGATE ® CL-RS protocol converter The UNIGATE CL-RS is designed to be installed onto a standard C rail (TS 35). ® The electrical connections are to be made as shown in Figure 33. The fieldbus sys- tem must be fitted with terminators at the front and back ends of the bus line. For this purpose, two slide switches are provided to connect one terminator (RS-485) / two terminators (RS-422) (for RS-485 (two-wire configuration): Rx-422 ➝...
  • Page 33 Accumulated discharge value, the two LSBs of a 48-bit value [ l] Please note: After having connected the UNIGATE CL-RS protocol converter to the OTT SLD, you have to start the OTT SLD operation mode "On-Line Data Collection" during com- missioning: Select the "Start Data Collection"...

  • Page 34: Appendix D - Representation Of The Accumulated Discharge Volumes

    The measured values for instantaneous discharge as well as the accumulated discharge values may take large to very large numerical values. Therefore, the OTT SLD splits the measured values into partial amounts that are weighed differently. In the evaluation unit (alternatively in the datalogger as far as it is able to handle value ranges in the magnitude required), these numerical values then have to be "reassembled"...

  • Page 35: Representation In Modbus Protocol

    D.2 Representation in Modbus protocol Instantaneous discharge Example: Q = 2 512.345 m³/s = 2 512 345 l/s inst Decimal 2 512 345 l ➝ 0x26 55d9 l Split into two partial amounts in one Modbus register each: ➝ Decimal 38 ➝...

  • Page 36: Appendix E - Installation Examples

    Appendix E – Installation examples The way how the OTT SLD is installed in a waterbody strongly depends on the local conditions. Installing the unit requires individual planning, based on the particular station. For installing the unit, OTT offer various stainless steel brackets and slide systems.

  • Page 37: Example #1 - Installation At A Staircase For Water Level Measurement (Mounting Rail With Slide)

    E.1 Example #1 – Installation at a staircase for water level measurement (mounting rail with slide)

  • Page 38: Example #2 - Installation At A Staircase For Water Level Measurement

    E.2 Example #2 – Installation at a staircase for water level measurement (dual T rail with roller slide)

  • Page 39: Example #3 - Installation At A Natural River Bank Slope (Mounting Rail With Slide)

    E.3 Example #3 – Installation at a natural river bank slope (mounting rail with slide)

  • Page 40: Example #4 - Installation At A Vertical Edge Wall (Mounting Rail With Slide)

    E.4 Example #4 – Installation at a vertical edge wall (mounting rail with slide)

  • Page 41: Example #5 - Installation On A Concrete Base In The River Bed

    E.5 Example #5 – Installation on a concrete base in the river bed...

  • Page 42: Example #6 - Installation At A Sheet Pile

    E.6 Example #6 – Installation at a sheet pile...

  • Page 43: Example #7 - Installation At A Vertical Edge Wall (Mounting Plate)

    E.7 Example #7 – Installation at a vertical edge wall (mounting plate)
  • Page 44 OTT HydroMet GmbH Ludwigstrasse 16 87437 Kempten · Germany Phone +49 831 5617-0 Document number +49 831 5617-209 22.330.001.K.E 09-0419 info@ott.com · www.ott.com...

This manual is also suitable for:

Sld 2.0 mhzSld 0.6 mhzSld 1.0 mhz

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