ULTRASONIC ANEMOMETER MODEL 81000 R.M. YOUNG COMPANY 2801 AERO PARK DRIVE, TRAVERSE CITY, MICHIGAN 49686, USA TEL: (231) 946-3980 FAX: (231) 946-4772 WEB: www.youngusa.
MODEL 81000 ULTRASONIC ANEMOMETER 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 available including a custom format which is easily set by the user.
. 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: 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 346.70 346.68 346.76 346.80 346.76 346.80 346.80 346.
BAUD: 38400 ---------------------A) 1200 B) 2400 C) 4800 D) 9600 E) 19200 F) 38400 X) EXIT TO MAIN MENU network with other 81000 instruments, each one should have a different address character. POLL CHARACTER (ADDR): A ENTER NEW CHARACTER: To poll the 81000, send MA! where A is the unique POLL CHARACTER. The 81000 will respond with the POLL CHARACTER and a space followed by the serial output string. FOR RS-485 ONLY! DUPLEX = 2 ----------------------1) HALF 2) FULL X) EXIT TO MAIN MENU 6.
CHKSUM calculates the bitwise exclusive-or of all characters in the output string starting with the rst character and ending with the last character of the last eld before the checksum. The checksum is expressed as a two-digit hex value preceded a space. ERROR CODE indicates the validity of the measurement. Any non-zero value indicates an invalid measurement. ERROR HANDLING must be set to INCLUDE INVALID DATA to use this eld. Keys to the error codes provide no useful information to the user.
m/s mph km/h knots 0.01 0.1 0.1 0.1 C° F° C° F° 0.01 0.01 0.01 0.01 W channel output value = 2550 mV Scale = 25 m/s Range = 5000 mV SPEED = [(25 x 2 / 5000) x 2550] -25 = 0.5 m/s UNITS 2 ------------------1) cm/s 2) m/s 3) mph 4) km/h 5) knots X) EXIT TO MAIN MENU For SPEED AZIMUTH ELEVATION Format: Windspeed = [(Scale / Range) x mV] Example: SPEED channel output value = 1950 mV Scale = 25 m/s Range = 5000 mV Speed = [(25 / 5000) x 1950] = 9.75 m/s 6.
needed and, when operated in polled mode, the connections may be bussed. Long custom output strings at high output rates and low baud rates may exceed the time needed to send the string. Solutions include using fewer measurement parameters, lower OUTPUT RATES, higher BAUD RATE, or some combination of these solutions. With measurement parameters, for example, sending wind data in both UVW and SPEED, AZIMUTH, ELEVATION formats is redundant and wastes space in the string.
APPENDIX A: WIRING CONNECTIONS 81000-90 Page 7
APPENDIX A: WIRING CONNECTIONS 81000-90 Page 8
APPENDIX A: WIRING CONNECTIONS 81000-90 Page 9
APPENDIX B: SENSOR ORIENTATION AND DIMENSIONS +V (WIND FROM NORTH) MODEL 81000 ULTRASONIC ANEMOMETER 0° NORTH EXAMPLE: WIND AT 45° 270° +U (WIND FROM EAST) 90° TOP VIEW 180° CARTESIAN POLAR (U-V-W) (WIND SPEED, WIND DIRECTION) 160 [6.3] SENSOR RADIUS - ELEVATION ANGLE WITH WIND FROM ABOVE 207 [8.1] + ELEVATION ANGLE WITH WIND FROM BELOW 568 [22.4] +W (WIND FROM BELOW) WHEN PROPERLY ALIGNED, JUNCTION BOX FACES SOUTH MOUNTING DEPTH 114 [4.5] MOUNTING: STANDARD 1" NPT PIPE Ø34.0 [1.
