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81000-90
MODEL 81000
ULTRASONIC ANEMOMETER
1.0 SPECIFICATION SUMMARY
WIND SPEED
Range: 0 to 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 ºC
Resolution: 0.01 ºC
Accuracy: ± 2 ºC (0 to 30 m/s wind)
VOLTAGE OUTPUT (4 CHANNELS)
Range: 0 to 5000 mV
Resolution: 12 Bit
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 17 cm
Mounting 34 mm (1.34 in) diameter
(standard 1 inch pipe)
Weight: Sensor weight 1.7 kg (3.8 lb)
2.0 INTRODUCTION
The Young Model 81000 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.
Measurement data are available as serial output using RS-232 or
RS-485 connections. A variety of serial output formats are avail-
able including a custom format which is easily set by the user.
Four voltage output channels representing sonic temperature and
wind in either Cartesian or Polar coordinates are also provided.
Operating parameters may be edited via simpli ed 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 stabi-
lized thermoplastic, stainless steel, and anodized aluminum com-
ponents. Electrical connections are made via an easily accessible
junction box. The unit mounts on standard 1 inch pipe, outside
diameter 34mm (1.34").
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 Outputs:
- Channel V1: Wind Speed (3D)
0-5000 mV = 0-50 m/s
- Channel V2: Wind Direction
0-5000mV = 0-540 Deg
- - Channel V3: Elevation
0-5000mV = -60° to +60°
- Channel V4: Sonic Temperature
0-5000mV = 220K to 320K
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 ow control set to NONE.
(10 pagine)
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