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Metek uSonic-2 User Manual

Ultrasonic anemometer
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M ET E K G m bH uSonic-2
1
uSonic-2
Ultrasonic anemometer
User manual
Version 6.56

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  • Page 1 M ET E K G m bH uSonic-2 uSonic-2 Ultrasonic anemometer User manual Version 6.56...
  • Page 2 M ET E K G m bH uSonic-2 METEK Meteorologische Messtechnik GmbH Fritz-Straßmann-Straße 4 D-25337 Elmshorn Germany 4121 4359-0 4121 4359-20 e-mail info@metek.de internet http://www.metek.de Version 6.56 Copyright: © 2014 METEK GmbH All rights reserved. No part of this manual may be reproduced, transmitted, stored in a...
  • Page 3 M ET E K G m bH uSonic-2 Index Chapter 1 Principle of measurement Page 5 Physical basics Page 5 Measurement of wind velocity Page 5 Acoustic temperature Page 6 Chapter 2 Installation Page 7 Mounting the uSonic-2 Page 7...
  • Page 4 M ET E K G m bH uSonic-2 Chapter 4 Analog data output (option) Page 25 General function of analog output Page 25 Configuration of analog output Page 25 4.2.1 Limitation of range (offset) Page 25 4.2.2 Scaling of analog output signals Page 26 4.2.3...
  • Page 5 The uSonic-2 is constructed with no moving parts so the uSonic-2 is not subject to mechanical aging. Therefore the uSonic-2 is virtual free of maintenance.
  • Page 6 M ET E K G m bH uSonic-2 Acoustic temperature By adding the two travel times of the sound pulses along each sound path, the contributions of the radial wind component eliminates each other and the residual sound velocity can be determined which is a measure for the acoustic temperature which corresponds in good approximation to the virtual temperature.
  • Page 7 12. Mounting the uSonic-2 The uSonic-2 can be mounted on a pipe with an inside diameter of 34mm. Please regard that the cable has to be installed inside of this tube. Alternatively a pipe clamp can be used. Contact METEK GmbH about additional equipment and adapters for masts.
  • Page 8 M ET E K G m bH uSonic-2 Vertical alignment against horizontal plane Screw to fix uSonic-2 Pipe clamp with cable outlet (option) Connection cable uSonic-2 Illustration: Mounting on pipe Grounding cable Pipe clamp Connection cable uSonic-2 Illustration: Mounting with pipe clamp...
  • Page 9 Connector Illustration: Dimensions uSonic-2 Adjustment to the north To detect the wind direction, the uSonic-2 has to be adjusted exactly to the geographical north. Consider that the north marker of the uSonic-2 shows to the north and the grounding screw shows to the south.
  • Page 10 Illustration: Top view uSonic-2 Illustration: North marker Installation and connection of the connector Usually the uSonic-2 is delivered with a compatible connector but without cable. A complete cable with user defined length and with assembled connector is available as an option.
  • Page 11 M ET E K G m bH uSonic-2 2.3.1 Installation of the connector Please see Appendix E, assembling connector. 2.3.2 Pin- assignment of the connector Consider position of code slot Illustration: Cable connector (female), view at contact sockets The sonic is optionally delivered with a complete16 wire connection cable with a cable length configured to contract.
  • Page 12 M ET E K G m bH uSonic-2 Cable pinning for a 10-wire cable without analog output channels Color Function Color Function green TxD-, Z (RS422) Bus-, Z (RS485) yellow TxD+, Y (RS422) Bus+, Y (RS485) + 12…36 V DC, power...
  • Page 13 Please attend specifications at usage of cables which are not manufactured by METEK GmbH! Attend local regulations, if required. 2.3.4 Connection of analog output signals (option) The uSonic-2 provides the possibility to display the measured values by 4 analog output ports. Following configurations are possible: 2 ports 0..10 V or 0..5 V...
  • Page 14 M ET E K G m bH uSonic-2 2.3.5 Connection of serial interface The uSonic-2 provides a serial interface. This is available as a RS232- or a RS422/RS485-type. This serial interface allows the configuration, operation and the data output of the uSonic-2.
  • Page 15 Flow control : XON/XOFF This is the standard configuration of the uSonic-2 (status of delivery). You will see data, displayed by the uSonic-2, if the connection is working properly. The displayed data are depending of the configuration of the uSonic-2. In state of delivery, you can see all 10 s data on the computer.
  • Page 16 Averaging Time Asking all system parameter: If you type just a „?“ and the <ENTER>- key, the uSonic-2 displays all system parameters, the firmware version and its serial number. Tip: You can record the terminal session and store the whole configuration („?“...
  • Page 17 RS485-bus should be made (i.e. sampling frequency, averaging time, etc.). The parameter EC should be set to 0 (EC=0) to disable the reflection of the commands by the uSonic-2. The last parameter of these settings should be the address of the uSonic-2.
  • Page 18 3.2.5 Device- specific service address Instead of the device-address (000-254) it is also possible to use the serial number of the uSonic-2. This may be helpful if the device- address is unknown – the serial number is printed on the identification plate.
  • Page 19 Serial data output The serial data output always starts with a letter. This letter signalizes the status of the uSonic-2 (Exception: PR=8, see chapter 3.3.1). This letter is called indicator, followed by a colon „:“. After this colon the content of the dataset will follow..
  • Page 20 M ET E K G m bH uSonic-2 3.3.1 Options of output format of digital data output It is possible to choice the output format (protocol) with the command PR (Protocol): Possible settings: PR=0 Standard protocol all values are displayed with identifier and space- keys.
  • Page 21 M ET E K G m bH uSonic-2 3.3.2 Choice of values with the parameter OD (output digital) The uSonic-2 provides following values: Value Scale Meaning Measurement range 0 … 60 m/s 0,01 m/s x- component of wind 0 … 60 m/s...
  • Page 22 M ET E K G m bH uSonic-2 3.3.3 Examples of different serial output formats The application of a data logger or diagnosis program it is necessary to know the exactly format of the dataset. The following illustrations describe some different dataset. The empty fields stand for space, CRLF stands for carriage return, linefeed.
  • Page 23 The possible setting is 4000…40000, analog to 4…40Hz. Averaging time The command AT defines the averaging time. The uSonic-2 accumulates in this time an averaged value of the the measured values. At the end of this time the uSonic-2 displays the averaged value at the serial interface and refreshes the analog output signals.
  • Page 24 M ET E K G m bH uSonic-2 Example: AV=4, AT=10, SF=40000 4 measuring cycles (40Hz) will be averaged coherent and committed to the processor. The processor averages these results and displays them after 10s. The processor can handle max. 10 Hz. Consequently the commands SF und AV are depending of each other and may limit each other.
  • Page 25 M ET E K G m bH uS o n ic - 2 Analog data output (option) The uSonic-2 provides 4 analog output signals. Variants of 0...5VDC, 0...10VDC or 0…20mA are available. General function of analog output The 4 analog output signals will stay at the last indicated value until the signals will be refreshed.
  • Page 26 M ET E K G m bH uSonic-2 4.2.2 Scaling of analog output To optimize the resolution, the range of the analog output signals can be configured. The commands VR and TR configure the whole possible range (consider also command AO, chapter 4.2.1).
  • Page 27 The analog output ports can be checked with test values. With OA=32 the analog output signals are fixed to constant values. The level of the signals depends on the hardware configuration of the uSonic-2 (0 … 2.5 VDC or 0... 5 VDC or 0...10 VDC) and on the commands TV and AO.
  • Page 28 M ET E K G m bH uSonic-2 Examples: TV=0 uSonic-2 variant 0...10 VDC / 0...20 mA AO=0 C1, C2 value: 0 VDC OA=32 C3, C4 value: 0 mA TV=50 uSonic-2 variant 0...5 VDC / 0...20 mA AO=0 C1, C2 value: 2.5 VDC...
  • Page 29 70%, an error will be indicated at the analog output ports like defined by the command AE. The data quality is an internal check. The uSonic-2 checks, how many measuring cycles are detected with implausible values. The possible setting is 1…100 (%).
  • Page 30 M ET E K G m bH uSonic-2 NMEA protocol A special output protocol type NMEA0183 is offered by the uSonic-2 in order to make the usage in marine applications as easy as possible. Because the NMEA- format requires certain interface adjustments usage of the following commands should be done only if the usage of the NMEA format is essential.
  • Page 31 M ET E K G m bH uS o n ic - 2 The output of this sentence can be activated/deactivated according to the setting of parameter NO (refer to table in chapter 5.1). Additional a checksum can be applied to each sentence (MWV and MTA). This behaviour is selected by parameter FR.
  • Page 32 M ET E K G m bH uSonic-2...

  • Page 33: Table Of Contents

    M ET E K G m bH uS o n ic - 2 System parameters and control commands System parameters Command Meaning Page A1…A4 Calibration amplitudes Device Address Analog Errorhandling Analog Offset Averaging Time Total Averaging Number Device Azimuth Baudrate Battery voltage Density threshold Echo...
  • Page 34 M ET E K G m bH uSonic-2 Test Values Version date Version number Velocity Range Control commands Command Meaning Page Abort Averaging Interval Battery Status Calibration L1 … L3 Load Parameters Log Status Redraw Data Read Log Reset S1 ... S3...

  • Page 35: Calibration Amplitudes

    Possible settings: RS422: 0 or 1…99 RS485: 001…255 The command AD defines a device specific address. In the RS422- mode the uSonic-2 responds to commands without an address and to commands with the specified address. Example: AD=0 : Address- mode switched off.

  • Page 36: Ao Analog Offset

    M ET E K G m bH uSonic-2 AE=3 C1…C4 maximum value See chapter 4.2.4 Analog Offset Possible setting 0…50 (% of the total available range) The command AO configures an offset to the analog output signals. This offset configures a range, which is not used for the data output.

  • Page 37: Br Baudrate

    AZ is implicated at displaying d, ds, x and y. Example: A compass is in line with the north marker of the uSonic-2. The compass needle is indicating 30°. Setting the command AZ=30 will correct the measured data. Baud rate...

  • Page 38: Ec Echo

    EC=0 No reflection of the commands.(recommended for RS485) EC=1 All commands will be reflected by the uSonic-2 when the ENTER- key is pushed. Frame Possible settings 0,2 The command FR defines if the data output of the serial interface is embedded in a frame of STX and ETX with a checksum control.

  • Page 39: Hd Sensor Head Down

    If HT is set to “2” the uSonic-2 identifies implausible values after a power new start, the uSonic-2 supposes an iced sensor head and the heater will be switched...

  • Page 40: Lc Last Calibration

    Last Calibration This information displays the date and time of the last calibration and will be set by the uSonic-2 while calibration procedure and cannot be entered by the user. Log Data Possible setting 0, 1, 2, 55 or 99...

  • Page 41: Lu Logger Unread

    M ET E K G m bH uS o n ic - 2 Logger unread Shows the number of unread data sets of the internal data logger. Maximum Deviation Possible setting 0 ... 65535 The command MD defines the acceptance criteria of the internal quality check.

  • Page 42: Calibration Offsets

    M ET E K G m bH uSonic-2 O1… Calibration offsets These values are calculated for each transducer by the uSonic-2 with the calibration procedure and cannot be entered by the user. Output Analog Possible setting 0, 1, 2, 3 or 32 The command OA defines the selection of the measured data for the analog output ports.

  • Page 43: Qt Qualitiy Threshold

    If i.e. QT=70 and the data quality is lower than 70%, an error will be indicated at the analog output ports like defined by the command AE. The data quality is an internal check. The uSonic-2 checks, how many measuring cycles are detected with implausible values.

  • Page 44: Sf Sampling Frequency

    00:08:00, 00:18:00, 00:28:00 etc. Synchronized Averaging Possible setting 0 or 1 The command SY defines if the data output is synchronized with the internal clock of the uSonic-2. If the SY=1, averaging will be finished at complete interval timing Example: SY=1 : If AT=15 the averaging time will be finished all full 15 s intervals, i.e.

  • Page 45: Tc Calibration Temperature

    Calibration Temperature Possible setting -5000 ... 5000 (0,01°C) To calibrate the uSonic-2, it is necessary to measure the temperature with a thermometer and enter the temperature with the command TC. The calibration temperature can just be entered in the service mode.

  • Page 46: Vd Version Date

    M ET E K G m bH uSonic-2 See chapter 4.2.3.1 Version date Shows the date of creation of the present firmware version. Version number Shows the present version number of firmware. Velocity Range Possible setting 1 ... 6000 (cm/s) To optimize the resolution, the range of the analog output signals can be configured.

  • Page 47: Bs Battery Status

    The command L1, L2 and L3 loads the stored configuration. See also description S1…S3 Log Status The command LS reads out the status of the internal data logger. The uSonic-2 displays the number of free, used and unread storage spaces. Example: C:LS...

  • Page 48: Rd Redraw Data

    The Read Log command is allowed only if LD is set to 1. Reset The command RS starts a reset of the uSonic-2. All parameters are stored in an EPROM, so the uSonic-2 will work after this reset with the same settings. S1…...

  • Page 49: Service Mode

    20110928. If the uSonic-2s configuration is changed and the user wants to change back to the stored configuration, the user just needs to enter L1 and the uSonic-2 works in the stored configuration. Version number The command VS reads out the several system parameters.

  • Page 50: Output Of Configuration

    Internal data logger Function and operation of the internal data logger The uSonic-2 provides an internal data logger. The internal data logger is a first- in/first-out- organized data logger. The capacity depends on the variant of the uSonic-2.
  • Page 51 M ET E K G m bH uS o n ic - 2 Log status The uSonic-2 displays the total number and the number of free and unread datasets of the internal data logger. Advice: You’ll find the DOS- program lcopy.exe and the windows- program...
  • Page 52 M ET E K G m bH uSonic-2 Appendix A Technical data Measurement range Wind velocity ............60 m/s Wind components ........... 60 m/s Wind direction ............360 ° Wind direction (with hysteresis) ....... 540 ° Temperatur .............. 60 °C Measurement resolution Wind velocity ............
  • Page 53 M ET E K G m bH uS o n ic - 2 Dimensions Path lengths ..............180 mm Sensor head Measuring head (Ø Height) ......300 165 mm Sensor height with integrated electronic box ..490 mm Mounting clamp (outer Ø lenght) ........33,7 40 mm Weigths - without cable...
  • Page 54 Enter i.e. TC=2260 ENTER (measured: 22,60°C) 11. Enter CA <ENTER> to start the calibration. The calibration takes approx. 30 s and the uSonic-2 will answer with “..done”. If an error message appears, please try again. 12. Check now the measured data.
  • Page 55 M ET E K G m bH uS o n ic - 2 Appendix C Mechanical drawing Ø 300 Ø 70 Ø 34 All dimensions are given in mm.
  • Page 56 M ET E K G m bH uSonic-2 Appendix D Allocation wind components Grounding screw in the south Northmarker Wind from S to N: y > 0 Wind from W to E: x > 0...
  • Page 57 M ET E K G m bH uS o n ic - 2 Appendix E assembling connector Soldered at Metek connectors!!
  • Page 58 M ET E K G m bH uSonic-2 Appendix F Packing Please use only original box for transport!!

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