Anemometer with Thermoplastic Propeller

R. M. Young, 27106DT, Anemometer with 08254 Gill Carbon Fiber Thermoplastic Propeller, Photo ChopperThe Gill Propeller Anemometer is a precision, single axis wind measuring instrument.The Gill Propeller Anemometer Photochopper is a low threshold precision air velocity sensor employing a fast response helicoid propeller. The instrument uses a high quality optical photo chopper which converts propeller rotation to a square wave signal whose frequency is linearly proportional to air velocity. The output signal is the same regardless of propeller rotation. For applications where propeller rotation in two directions is required, the model 27106F is offered.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.The instrument mounts to 3/4 inch standard pipe. A rugged cable connector provides both electrical and mechanical connection. A dust cap is provided to protect the connector when the instrument is removed.