Young Ultrasonic Anemometer Marine Model Model 85106 - Manual (Page 5)

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85106-90
The sensor wind speed threshold is preset to 0.25 m/s
(0.6 mph). Wind below this level is displayed as zero.
The wind direction display will show the last value that
appeared when wind speed was above threshold.
3.3 Verify sensor response by using a small fan or gently
blowing through the measuring section. Move the fan to
create wind from several different directions and confirm
changes on the Wind Tracker display. Small fans and
gentle blowing create irregular flow patterns. This test is
for general checkout only.
If the Marine Wind Tracker display continuously shows "Ser Err"
then it is not receiving data from the sensor. Remove power and
check all wiring connections. If the problem cannot be corrected,
contact your YOUNG representative.
If the sensor is NOT USED with a YOUNG Marine Wind Tracker,
an alternative output must be used to check operation. For voltage
output, a voltmeter may be used as an indicator. For other serial
formats, use the wiring diagrams and appropriate parameter
settings as a guide. See sections 5.0 and 6.0 of this manual.
IMPORTANT: NMEA, the default serial output format, transmits
ASCII data. Using a communication program such as
HyperTerminal will allow for monitoring the serial output.
4.0 INSTALLATION
4.1 PLACEMENT
Proper instrument placement is important. Eddies from buildings,
trees, or other structures can influence measurements. For
most applications, locate the sensor well above or upwind of
obstructions. As a general rule, air flow around a structure is
disturbed to 2 times the height of the structure upwind, 6 times the
structure downwind, and up to 2 times the height of the structure
above ground.
4.2 MOUNTING AND ALIGNMENT
The sensor mounts to standard 1-inch (IPS) pipe with an outside
diameter of 1.34 inches (34 mm).
Generally, the sensor is aligned to north. In this orientation, the
sensor junction box faces south (180 degrees). The transducers
may be used as sighting aids. See diagram APPENDIX B.
4.2.1 Place orientation ring over pipe with guide pin up.
4.2.2 Place sensor mounting post over pipe.
4.2.3 Using the transducers as a sighting aid, align the sensor
with a feature on the horizon that represents the proper
orientation. After alignment, tighten the mounting post
band clamp to secure the position. DO NOT OVER-
TIGHTEN.
4.2.4 Slide the orientation ring up so its guide pin is fully
engaged in the sensor mounting post notch. Tighten the
orientation ring band clamp to secure its position. DO
NOT OVER- TIGHTEN.
If the sensor needs to be removed later, leave the orientation ring
on the pipe to preserve sensor alignment.
4.3 CONNECTIONS
With long cable lengths, resistance in the power supply wires
reduces the available voltage at the sensor. Power at the sensor
must be in the range of 9 to 16 VDC when the sensor is operating.
See WIRING DIAGRAMS in APPENDIX A.
5.0 OPERATION
5.1 WITH YOUNG MARINE WIND TRACKER DISPLAY
The default serial output format is NMEA which is compatible with
the Young Model 06206 Marine Wind Tracker display. The Marine
Wind Tracker receives measurements in the form of ASCII data
via an RS-485 serial connection. The Wind Tracker automatically
converts the data to wind values which appear on the display. Set
the Wind Tracker input to 'SER'. See the Marine Wind Tracker
manual for display options.
5.2 VOLTAGE OUTPUTS
When the default NMEA format is used, analog voltage outputs are
active. These may be connected to a data logger or other device
such as the YOUNG Model 26700 Programmable Translator. See
VOLTAGE OUTPUTS in APPENDIX A for connection details and
calibration values.
Voltage outputs may be enabled with any serial output format
except SDI-12 even if the serial output connection itself is disabled.
Polar speed and direction, which is the default, or Cartesian (UV)
voltage output format may be selected. See section 6.4.13 and
APPENDIX B for additional details. The voltage output may also be
set to signal the STATUS CODE. The default setting causes VOUT
to ignore the STATUS CODE. See sections 5.3.2 and 6.4.14 for
additional details.
When cable length between voltage output terminals and data
acquisition system exceeds 3m (10 ft.), the voltage outputs should
be measured differentially.
5.3 SERIAL OUTPUT FORMATS
A variety of serial output formats are available. From the factory, it
is programmed for operation with the Young Marine Wind Tracker
display (NMEA format). Other serial formats are selected using a
PC and the Windows 2DSETUP program (2Dsetup.exe) provided.
The following sections discuss format options available. Each
command is discussed in detail in section 6.0.
5.3.1 RMYT
RMYT is a 6-byte binary data format sent at 9600 baud using the
RS -485 OUTPUT ONLY connections. This format is used with the
YOUNG Model 06201 Wind Tracker.
If RMYT default parameters are used (no other parameters
altered), the maximum number of internal samples are always
used, measurements and outputs run continuously, voltage outputs
are enabled, and both RS-232 and RS-485 connections are
enabled. The average current consumption is about 150 mA, not
including heater power.
5.3.2 ASCII
ASCII output provides continuous wind measurement data in text
format. Between each measurement cycle, the sensor goes into a
low power mode. There are a number of parameters related to the
ASCII serial output format which may be altered. Please note that
the default values are recommended for most applications.
Careful analysis of the sensor's application should be done prior
to making changes due to the interaction of parameters such as
OUTPUT DELAY and SAMPLE COUNT. See section 6.0.
ASCII output appears either in POLAR or CARTESIAN (UV)
format. With POLAR format, the wind speed threshold and wind
speed units are selected. With CARTESIAN format, the threshold
is ignored and wind speed units are always meters per second
(m/s).