ULTRASONIC ANEMOMETER MODEL 81000VRE 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 81000VRE ULTRASONIC ANEMOMETER 2.0 INTRODUCTION The Young Model 81000VRE 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.
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 0.0 346.70 346.68 346.76 346.80 346.76 346.80 346.80 346.82 25.14 25.11 25.25 25.30 25.25 25.30 25.30 25.35 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.
FOR RS-485 ONLY! DUPLEX = 2 ----------------------1) HALF 2) FULL X) EXIT TO MAIN MENU 6.7 SERIAL OUTPUT FORMAT SERIAL OUTPUT FORMAT sets the output string for serial output. Preset and custom formats are available. SERIAL OUTPUT FORMAT 1 -----------------------------------1) CUSTOM 3) NMEA (CHANGES OTHER PARAMETERS, SEE MANUAL) 4) POLLED CUSTOM 6) POLLED BINARY X) EXIT TO MAIN MENU 6.3 ERROR HANDLING ERROR HANDLING determines the manner in which invalid measurements are handled.
the last character of the last eld before the checksum. The checksum is expressed as a two-digit hex value preceded a space. delay between the start of the measurement and data availability is determined by the OUTPUT RATE parameter (see section 6.5) 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.
UNITS 2 ------------------1) cm/s 2) m/s 3) mph 4) km/h 5) knots X) EXIT TO MAIN MENU driving rain even at high OUTPUT RATES but light mist or heavy fog can allow droplets to accumulate on the transducer faces and block the measurement. Measurements may be made in driving snow although frost and snow that adheres to the transducer face may block the measurement. Similarly, freezing rain on the transducer face may block the measurement. 6.
APPENDIX A: WIRING CONNECTIONS 81000VRE-90 Page 6
APPENDIX A: WIRING CONNECTIONS 81000VRE-90 Page 7
APPENDIX A: WIRING CONNECTIONS 81000VRE-90 Page 8
APPENDIX B: SENSOR ORIENTATION AND DIMENSIONS +V (WIND FROM NORTH) MODEL 81000VRE 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 +W (WIND FROM BELOW) 719 [28.3] WHEN PROPERLY ALIGNED, JUNCTION BOX FACES SOUTH 114 [4.5] ORIENTATION RING MOUNTING: STANDARD 1" NPT PIPE Ø34.0 [1.
