Propeller Anemometer
27105
The Gill Propeller Anemometer is a low threshold precision air
velocity sensor employing a fast response helicoid propeller.
The instrument uses a high quality tach-generator transducer
which converts propeller rotation to a DC voltage that is linearly
proportional to air velocity. The output signal is suitable for a wide
range of signal translators and data logging devices.
Airflow from any direction may be measured, however, the propeller
responds only to the component of the air flow which is parallel to
the axis of its rotation. Off-axis response closely approximates a
cosine curve (see accompanying graphs) with appropriate polarity.
With perpendicular air flow, the propeller does not rotate.
For detailed studies of low air speeds, optional propeller shaft
extensions improve response in the 90° stall region by improving
symmetry and reducing the stall angle.
The instrument mounts to 3/4 inch standard pipe. A rugged cable
connector provides both electrical and mechanical connection. A
dustcap is provided to protect the connector when the instrument
is removed.