AS 2923-1987

1 - AS 2923-1987 AMBIENT AIR - GUIDE FOR MEASUREMENT OF HORIZONTAL WIND FOR AIR QUALITY APPLICATIONS
4 - PREFACE
4 - CONTENTS
5 - FOREWORD
6 - 1 SCOPE.
6 - 2 APPLICATION.
6 - 3 REFERENCED DOCUMENTS.
6 - 4 DEFINITIONS.
6 - 4.1 Anemometer
6 - 4.2 Wind direction
6 - 4.3 Threshold (of a speed sensor)
6 - 4.4 Distance constant (of a speed sensor)
6 - 4.5 Threshold (of a wind vane)
6 - 4.6 Distance constant (of a wind vane)
6 - 4.7 Overshoot (of a wind vane)
6 - 4.8 Damping ratio (of a wind vane)
6 - 4.9 Si gma theta (sq )
6 - 4.10 Run-down time
6 - 4.11 Accuracy
6 - 4.12 Linearity
6 - 5 PRINCIPLE.
7 - 6 APPARATUS.
7 - 6.1 General.
7 - 6.2 Performance requirements.
9 - 7 CALIBRATION AND MAINTENANCE.
9 - 7.1 General.
9 - 7.2 Performance monitoring and instrument maintenance programs.
10 - 8 SITING AND INSTALLATION.
10 - 8.1 Exposure.
13 - 8.2 Mounting.
14 - 8.3 Protection in adverse conditions.
14 - 9 COMMISSIONING AND OPERATING.
14 - 10 RESULTS.
14 - 10.1 Data processing.
15 - 10.2 Sampling period.
15 - 10.3 Sigma theta.
15 - 10.4 Code for wind direction reporting.
15 - 11 ERRORS IN WIND MEASUREMENT.
15 - 11.1 General.
16 - 11.2 Light winds.
16 - 11.3 Fluctuating winds.
16 - 12 REPORTS.
17 - BIBLIOGRAPHY

Sets guidelines for measurement of horizontal wind speed and direction using rotating cup or propeller type anemometers and wind vanes. Includes performance requirements, performance monitoring procedures and an instrument calibration and maintenance program for wind instruments. Guidelines are given for the siting and installation of wind instruments to obtain the most representative wind data possible for a given situation. Errors in the measurement of wind speed are discussed.

This standard sets out a guide for measurement of horizontal wind speed and direction using rotating cup or propeller type anemometers and wind vanes.