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Nortek VECTRINO User Manual

Velocimeter
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V
ECTRINO
V E L O C I M E T E R
USER GUIDE
OCTOBER 2004
Rev. C

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Summary of Contents for Nortek VECTRINO

  • Page 1 ECTRINO V E L O C I M E T E R USER GUIDE OCTOBER 2004 Rev. C...
  • Page 3 – be copied, photocopied, translated, converted or reduced to any electronic medium or machine-readable form without prior consent in writing from Nortek AS. Every effort has been made to ensure the accuracy of this manual. However, Nortek AS makes no warranties with respect to this documentation and disclaims any implied warranties of merchantability and fi...
  • Page 4 Nortek’s Forums at www.nortek-as.com/cgi-bin/ib/ikonboard.cgi and post your message there. The Forums also offer a great opportu nity to share your experience using Nortek sensors with other users around the world, and to learn from their experience. Communicating with us...
  • Page 5 This chapter provides the technical specifi cations. Chapter 3 – Technical Description In this chapter you’ll fi nd a description of the Vectrino’s functional principles, some of the theory behind the Doppler principles, and practical aspects such as the cable pin-outs.
  • Page 6 What’s in this manual? Chapter 6 – Use with other instruments The Vectrino may be used with other Vectrinos, as a master (controlling the sampling), or as a slave (having the sampling controlled from the outside). This chapter describes what to consider when setting up a multisensor system.

  • Page 7: Table Of Contents

    Error Codes and Status Codes................... 21 CHAPTER 4 Initial Preparations ......................23 Inspect the Received System ..................... 23 Installing the Vectrino PC Software ................. 24 Verifying Proper Operation ....................24 Run a Functionality Check ....................24 The Probe Check Feature....................26 ....................29...
  • Page 8 My Data Does Not Look Right..................43 Grounding Problems......................44 Vibration in Mounting Fixture................... 44 Initial Problems? Did You Check This? ................44 No Detection of the Vectrino on the Serial Port..............45 Diagnostic Testing Using the Probe Check Function............46 ........................49 Appendix 2 Maintenance Preventive Maintenance.....................

  • Page 9: Chapter 1 Getting Started

    Thank you for purchasing a Nortek Vectrino Velocimeter! The Vectrino has been designed to provide you with many years of safe, reliable service. Your approach to the Vectrino documentation depends on what you want to do and how much you already know. Depending on your requirements you may fi nd that you use some parts of this manual regularly and others not at all.

  • Page 10: Warranty

    In the unlikely event of trouble with your Nortek product, fi rst try to identify the problem by consulting the documentation accompanying your Nortek product. If you need further assistance when trying to identify the problem, please contact your local Nortek representative or the factory.

  • Page 11: Chapter 2 Main Data

    You hear the Doppler effect whenever a train passes by – the change in pitch you hear tells you how fast the train is moving. The Vectrino uses the Doppler effect to measure current velocity by transmitting a short pulse of sound, listening to its echo and measuring the change in pitch or frequency of the echo.

  • Page 12: Specifi Cations

    WATER VELOCITY MEASUREMENT ±0.01, 0.1, 0.3, 1, 2, 4 m/s (software selectable) Range: ±0.5% of measured value ±1 mm/s Accuracy: 1–25 Hz, 1–200 Hz (Vectrino + fi rmware only) Sampling rate (output) : 200–5000 Hz Internal sampling rate SAMPLING VOLUME 0.05 m...
  • Page 13 DIMENSIONS 70 mm Cylinder: 388 mm. Length: OPTIONS Standard or Vectrino + fi rmware (upgrade to Vectrino + fi rmware is also • available as retrofi t) 4-beam down-looking probe on 40-cm stem • or 4-beam probe on 1-m cable Upgrade kit from NDV or ADV™...
  • Page 14 CHAPTER 2 Main Data Rev. C • 10.2004...

  • Page 15: Chapter 3 Technical Description

    NORTEK VECTRINO VELOCIMETER User Guide CHAPTER 3 Technical Description Vectrino Components Rigid stem shown, cable probe available POM (Delrin) instrument housing and endcaps Recesses for clamping Integrated shape zinc anode Underwater mateable connector shown Low cost lab-type connector available Title:...

  • Page 16: Temperature Sensors

    Cable Wiring. cable. The connector type is either IP68 connector or MCBH-12-FS, bronze (Impulse). The Vectrino power lines are diode protected, so you don’t have to Impulse connector worry about wiring the Vectrino power backwards – this will not damage your (external view) instrument.

  • Page 17: Using The Doppler Effect

    You hear the Doppler effect whenever a train passes by – the change in pitch you hear tells you how fast the train is moving. The Vectrino uses the Doppler effect to measure current velocity by transmitting short pairs of sound pulses, listening to their echoes and, ultimately, measuring the change in pitch or frequency of the returned sound.
  • Page 18 Since the receive beams are slanted at 30°, all three receivers measure the veloc- ity that is slanted about 15° from the transmit beam. This means that the Vectrino is more sensitive to the Z-velocity (the component parallel to the transmit beam) than it is to the X- or Y-velocity. Consequently, the Z-velocity component yields a lower measurement uncertainty.

  • Page 19: Data Handling

    NORTEK VECTRINO VELOCIMETER User Guide on your beam geometry. The long-term bias in the Vectrino is typically a frac- tion of 1 cm/s. The Vectrino software predicts errors based on the short-term error of a single ping and the number of pings averaged together.

  • Page 20: Ascii Formats

    CHAPTER 3 Technical Description ASCII formats The ASCII data format is subject to change, but the current format is always de- scribed in the header ( ) fi le generated by the data conversion function. .hdr Velocity Data Header Type Unit Distance Quality...

  • Page 21: Correcting For Sound Speed Errors

    NORTEK VECTRINO VELOCIMETER User Guide Correcting for Sound Speed Errors If you enter the wrong salinity, the Vectrino will compute the wrong sound speed. You can correct velocities ( ) for sound speed errors using the following equation: New sound speed •...
  • Page 22 CHAPTER 3 Technical Description Rev. C • 10.2004...

  • Page 23: Chapter 4 Initial Preparations

    Verify that you have received all parts. Install the Vectrino Software on a PC. Perform a functional test of your new Vectrino. When you are ready to make your measurements, mount the Vectrino in ac- cordance with the guidelines provided in Mounting guidelines (in this chap- ter).

  • Page 24: Installing The Vectrino Pc Software

    CHAPTER 4 Initial Preparations Do not hesitate to contact NORTEK if you fi nd that parts of the Note! delivery are missing. Installing the Vectrino PC Software To install the Vectrino software on a PC running Microsoft ® Windows ®...
  • Page 25 NORTEK VECTRINO VELOCIMETER User Guide The velocity in water (left part of the graph) and in air (right part of the graph). Put the transducers in the water and observe the velocity, the standard devia- tion and the amplitude in counts. Watch the graphical view of the velocity as the probe goes in and out of the water.

  • Page 26: The Probe Check Feature

    Designed to act as a measurement quality assurance tool, the func- Probe Check tion in the Vectrino software lets you inspect the region where the Vectrino makes its measurements by showing how the signal varies with range. To start the probe check: Make sure the probe is submerged in water.
  • Page 27 Strictly speaking, we are unable to measure the signal without the noise present, so should read . However, for SNR Amplitude Amplitude signal signal + noise values in the magnitude applicable to typical Vectrino situations, the differ- ence is negligible. Rev. C • 10.2004...
  • Page 28 CHAPTER 4 Initial Preparations Rev. C • 10.2004...

  • Page 29: Chapter 5 Setting Up For Operation

    NORTEK VECTRINO VELOCIMETER User Guide CHAPTER 5 Setting Up for Operation The Vectrino software program has been designed to set up and read back data acquired by the Vectrino. Confi guration To confi gure your Vectrino velocimeter: Connect the Vectrino to power and to the COM port of the PC.
  • Page 30 To gain access to the Confi guration setup, select Data collection > Confi guration The Confi guration setup pane lets you set up all accessible Vectrino parameters. Note that the 200 Hz sampling rate applies to Vectrino versions only. Rev. C • 10.2004...

  • Page 31: The Confi Guration Settings

    The available nominal velocity range settings are: Vectrino: ±0.01, ±0.1, ±0.3, ±1, ±2, ±4 [m/s] • Vectrino : ±0.01, ±0.1, ±0.3, ±1, ±2, ±4 [m/s] • Sampling Volume Height Setting The sampling volume is cylindric with a fi xed diameter of 6 mm. The height is user adjustable.

  • Page 32: Power Level

    Input Sync The SyncIn signal permits external control of the sampling. Two options are available; initiation of the Vectrino sampling upon receipt of an input pulse, or full external control of the data collection rate. Typically, another instrument will provide TTL pulses required to trigger the data collection or the signal can be used as a remote switch that allows the operator to start data collection at the push of a button.

  • Page 33: Vertical/Horizontal Velocity Range

    SyncIn will correspond to an average since the last rising edge of the SyncIn. The Vectrino must be confi gured with the setup software for a sampling rate that is equal to or higher than the sampling rate that will be used.

  • Page 34: Communication Between Vectrino And Pc

    Communication Between Vectrino and PC The Vectrino computer interface is of the RS 232 type. However, if you are going to use more than one Vectrino at the time, you will easily run out of serial ports on your PC. What to do then? Enter USB interface.

  • Page 35: Changing The Baud Rate

    Stop Data Collection 19200 64 Hz it permanent. 38400 128 Hz If you remove power and reapply it, the Vectrino will re-awake with the new 57600 200 Hz baud rate. Table showing the highest permissible sampling rate for a If data download is interrupted, the Vectrino may be left with a baud Note! given baud rate.
  • Page 36 CHAPTER 5 Setting Up for Operation Rev. C • 10.2004...

  • Page 37: Chapter 6 Use With Other Instruments

    Your Vectrino may serve as master for other Vectrinos, or its sampling may be controlled by other sensors. If you connect a controller to the Vectrino, you may set up a fairly sophisticated system, in which the controller may power the Vectrino and provide it with sync pulses to control the sampling accurately.
  • Page 38 SyncIn will correspond to an average since the previouis rising edge of the SyncIn. The Vectrino must be confi gured with the setup software for a sampling rate that is equal to or higher than the sam- pling rate that will be used.

  • Page 39: Specifi Cations Of Signal Levels

    NORTEK VECTRINO VELOCIMETER User Guide Specifi cations of Signal Levels The SyncIn input voltage must be between 0 V and 5.0 V. The SyncIn is a Schmitt Trigger input with a pulldown resistor of 100kΩ to ground. The input threshold values for the SyncIn are: input posi tive threshold, 2.2 V...
  • Page 40 Vectrinos. Connect the ground cables together. Choose Out put Sync for for the fi rst Vectrino. This will be the master. In the setup for the two Vectrino other Vectrinos that will be slaves, check both boxes in the Input Sync ( Start ).
  • Page 41 Vectrinos. Connect the ground cables together. Choose Out put Sync for for the fi rst Vectrino. This will be the master. In the setup for the two Vectrino other Vectrinos that will be slaves, check both boxes in the Input Sync ( Start ).
  • Page 42 CHAPTER 6 Use with Other Instruments Rev. C • 10.2004...

  • Page 43: Appendix 1 Troubleshooting

    User Guide Appendix 1 Troubleshooting Noisy Data You may experience that the Vectrino works as it should, but that there is a lot of noise in the velocity. Noisy data may be caused by: Not enough particles in the water •...

  • Page 44: Grounding Problems

    fl oor (i.e. placing it on a chair). Also, feel free to call NORTEK for fur ther guidance. Keep in mind that ground- ing problems occur around man-made structures, but is not normally a problem in the fi...

  • Page 45: No Detection Of The Vectrino On The Serial Port

    If the Vectrino is powered and properly connected, Send Break and if the terminal is set to use the correct serial port, you will see the Vectrino’s wake-up mes sage. If you see a response consisting of garbled text or strange characters, the Vec- trino and terminal program are probably using different baud rates.

  • Page 46: Diagnostic Testing Using The Probe Check Function

    OK. [mm] Too little backscatter The signal level (H) should reach at least 70 counts. [mm] Broken probe indicated by fl at signal around 40 counts Return the Vectrino to the factory! [mm] Rev. C • 10.2004...
  • Page 47 20 counts (I), clean the receive transducer and make sure it is not blocked. If this does not rectify the problem, return the Vectrino to the factory. [mm] Noise level is too high indicating a possible...
  • Page 48 APPENDIX 1 Troubleshooting Rev. C • 10.2004...

  • Page 49: Appendix 2 Maintenance

    Before you assemble a system that involves custom cables, power supplies or the like, fi rst assemble and test the Vectrino using just the cables and battery that came with the system. This is the easiest way to get the system up and working, and if you have trouble you can always return to this setup to confi...
  • Page 50 Appendix 2 Maintenance Rev. C • 10.2004...

  • Page 51: Appendix 3 Returning Vectrino For Repair

    Nortek AS is by no means liable if the instrument is damaged or disappear while being shipped to Nortek AS for repair. Likewise, Nortek AS is not liable for conse- quential damages as a result of instruments becoming damaged or disappear- ing while being shipped to Nortek AS for repair.
  • Page 52 APPENDIX 2 Spare Parts Rev. C • 10.2004...
  • Page 53 NORTEK VECTRINO VELOCIMETER User Guide Vangkroken 2 51 Rud 174 5 13 7 7 Rev. C • 10.2004...
  • Page 54 APPENDIX 2 Returning Vector for Repair Rev. C • 10.2004...
  • Page 56 Nortek AS, Vangkroken 2, NO-1351 Rud, Norway. Tel +47 6717 4500. Fax +47 6713 6770. inquiry@nortek.no. www.nortek-as.com...

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