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 physical access. The range of accurate measurement is in the range of 100
introduce inaccuracies.
In order to use the rotating vane anemometer, it is placed in a position
perpendicular to the airflow. When the rotating vane gets up to a stable
speed, the start lever is turned, engaging the vane to the counting
mechanism. After 30 seconds or 1 minute, the counting mechanism is
disengaged, and the velocity is calculated.
With this instrument, as with all air measuring devices, make sure that
you are not blocking the airflow from the instrument with your hand or your
body. An interesting feature of a continuously measuring and recording
instrument such as this is that the need to take separate readings across
the face of a grille can be eliminated. The anemometer may be continuously
moved across the face of the grille while the velocity is being measured.
The overall reading will then be an actual average, as recorded.
The angular settings of the blades of the rotating vane are crucial to
the accuracy of the instrument. This is not a device to be subjected to
rough treatment if accuracy is to be maintained. Periodically, this
instrument needs to be recalibrated.
FIGURE 2-22
Rotating Vane Anemometer
2-21
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