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MODEL 81000V
ULTRASONIC ANEMOMETER
1.0 SPECIFICATIONS
WIND SPEED
Range:
0-40 m/s (0 to 90 mph)
Resolution:
0.01 m/s
Threshold
0.01 m/s
Accuracy:
±1% rms ±0.05 m/s (0 to 30 m/s)
±3% rms (30 to 40 m/s)
WIND DIRECTION
Azimuth Range:
0.0 to 359.9 degrees
Elevation Range:
± 60.0 degrees
Resolution:
0.1 degree
Accuracy:
± 2° (1 to 30 m/s)
± 5° (30 to 40 m/s)
SPEED OF SOUND
Range:
300 to 360 m/s
Resolution:
0.01 m/s
Accuracy:
± 0.1% rms ± 0.05 m/s (0 to 30 m/s wind)
SONIC TEMPERATURE
Range:
-50 to +50° C
Resolution:
0.01° C
Accuracy:
± 2° C (0 to 30 m/s wind)
VOLTAGE INPUT
(4 CHANNELS)
Range:
0 to 5000 mV V1 and V2
0 to 1000 mV V3 and V4
Resolution:
1 part in 4000
Accuracy:
± 0.1% of full scale
GENERAL
Air sample column:
10 cm high X 10 cm diameter
Air sample path:
15 cm
Output rate:
4 to 32 Hz (selectable)
Output formats:
Serial data (selectable)
RS-232 and RS-485
Baud Rates:
1200 to 38400
Power Supply:
12 to 24 VDC, 110 mA
Dimensions:
Overall height 56 cm
Support arm radius 16 cm
Mounting Ø 34 mm (Ø 1.32 in)
(standard 1 inch pipe)
Weight:
Sensor weight 1.7 kg (3.8 lb)
Operating
Temperature:
-40 to +60°C
2.0 INTRODUCTION
The Young Model 81000V measures three dimensional wind velocity
and speed of sound based on the transit time of ultrasonic acoustic
signals. Sonic temperature is derived from speed of sound which
is corrected for crosswind effects. Four voltage input channels
measure DC signals from external sensors concurrent with wind
measurements.
Measurement data are available as serial output using RS-232 or
RS-485 connections. A variety of serial output formats are available
including a custom format which is easily set by the user.
Operating parameters may be edited via simplified menus using
an ordinary serial communication program like HyperTerm. All
parameters are stored in non-volatile memory.
Superior environmental resistance is achieved by using UV stabilized
thermoplastic, stainless steel, and anodized aluminum components.
Electrical connections are made via an easily accessible junction
box. The unit mounts on standard 1 inch pipe, outside diameter 34
mm (1.32").
3.0 INITIAL CHECKOUT
Carefully unpack the unit and inspect for physical damage. Any
damage should be reported to the shipper. The sensor arrives fully
calibrated and ready to use.
FACTORY DEFAULT CONFIGURATION:
Serial Output:
- RS232 at 38400 Baud
- ASCII Text Serial String
Wind Speed - 3D (m/s)
Direction (Deg)
Elevation (Deg)
Speed of Sound (m/s)
Sonic Temperature (°C)
Analog Voltage Inputs:
- Channel V1:
- Channel V2:
- Channel V3:
- Channel V4:
NOTE: Factory default settings omit voltage
input measurements from the serial output
string. To include them, set CUSTOM or POLL
CUSTOM serial output format. See section 6.7.
All analog input measurements are normalized
to a 0-4000 unitless scale
A simple four-step operational check may be performed as follows:
1. Remove junction box cover. Connect power and signal wires
to terminals as indicated in wiring diagram (APPENDIX A) for
RS-232 OUTPUT. Connect serial cable to computer COM port.
2. Start a serial communications program (like HyperTerm) with
baud rate at 38400 and flow control set to NONE.
3. Apply power to the 81000 sensor. There will be a 4 second delay
for initialization then the unit will begin to output data at four times
per second using the following format: speed (m/s) azimuth (deg)
elevation (deg) speed-of-sound (m/s) sonic-temperature (°C).
Verify that all values are present on the display. Typical output is
shown below:
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
A threshold level of 0.2 m/s is preset from the factory. Wind
below the threshold, such as in still air, is output as 0.00
m/s. Azimuth may be any value from 0.0 to 359.9 degrees.
Page 1
0-5000 mV Full Scale
0-5000 mV Full Scale
0-1000 mV Full Scale
0-1000 mV Full Scale
0.0
346.70
25.14
0.0
346.68
25.11
0.0
346.76
25.25
0.0
346.80
25.30
0.0
346.76
25.25
0.0
346.80
25.30
0.0
346.80
25.30
0.0
346.82
25.35
81000V-90(L)
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