Met One 034B Wind Set
13
Symptom: Incorrect wind direction
1. Verify that the excitation voltage, range code, multiplier and offset
parameters are correct for the datalogger type.
2. Check orientation of sensor as described in Section
(p. 6)
8.2.2 Wind Speed
Symptom: No wind speed
1. Check that the sensor is wired to the pulse channel specified by the pulse
count instruction.
2. Disconnect the sensor from the datalogger and use an ohm meter to check
the reed switch. The resistance between the red and black wires should
vary from infinite (switch open) to less than 1 ohm (switch closed) as the
cupwheel is slowly turned.
3. Verify that the configuration code (switch closure, Hertz), and multiplier
and offset parameters for the pulse count instruction are correct for the
datalogger type.
9. References
The following references give detailed information on siting wind speed and
wind direction sensors.
EPA, 1989:
Quality Assurance Handbook for Air Pollution Measurements
System
, Office of Research and Development, Research Triangle Park,
NC, 27711.
EPA, 1987:
On-Site Meteorological Program Guidance for Regulatory
Modeling Applications,
EPA-450/4-87-013, Office of Air Quality Planning
and Standards, Research Triangle Park, NC 27711.
The State Climatologist, 1985:
Publication of the American Association of
State Climatologists: Height and Exposure Standards
, for Sensors on
Automated Weather Stations, vol. 9, No. 4.
WMO, 1983:
Guide to Meteorological Instruments and Methods of
Observation,
World Meteorological Organization, No. 8, 5th edition,
Geneva, Switzerland.
