Gill Propeller Anemometer

　　Model 27106

　　The Gill Propeller Anemometer is a precision, single axis wind measuring instrument.

　　The Gill Propeller Anemometer utilizes a fast response helicoid propeller and high quality tach-generator transducer to produce a DC voltage that is linearly proportional to air velocity. Airflow from any direction may be measured, however, the propeller responds only to the component of the air flow which is parallel to its axis of rotation. Off-axis response closely approximates a cosine curve with appropriate polarity; with perpendicular air flow, the propeller does not rotate. The output signal is suitable for a wide range of signal translators and data logging devices. The standard expanded polystyrene (EPS) propeller offers maximum sensitivity at low wind speeds. An optional carbon fiber thermoplastic (CFT) propeller is available for greater range and durability.

　　Specifications

　　08274 Expanded Polystyrene Propeller (EPS):

　　Diameter: 22 cm

　　Pitch: 29.4 cm wind passage per revolution

　　Range: 0-25 m/s (55 mph)

　　Threshold:* 0.3 m/s (0.6 mph)

　　Distance constant:* 1.0 m (3.2 ft)

　　08254 Carbon Fiber Thermoplastic Propeller (CFT):

　　Diameter: 20 cm

　　Pitch: 30.0 cm wind passage per revolution

　　Range: 0-35 m/s (80 mph)

　　Threshold*: 0.4 m/s (0.8 mph)

　　Distance constant*: 2.1 m (6.9 ft)

　　Signal Output:

　　Standard: tach-generator transducer - analog DC voltage proportional to wind component. Polarity indicates rotation direction. 1800 RPM (500 mV) = 8.8 m/s (19.7 mph).

　　Optional: Photochopper transducer, 10 pulse/rev. 1800 RPM (300 Hz) = 8.8 m/s (19.7 mph).

　　Power Requirement:

　　Standard: Anemometer with tach-generator is self-powered.

　　Optional: Anemometer with photochopper requires 5-15 VDC at 11mA.

　　Dimensions:

　　43 cm (17 in) long w/ mounting., 2.5 cm (1 in) housing dia. Propeller diameter: (see above)

　　Mounting: ¾” pipe thread adapter with MS type connector (connects to anemometer)

　　Weight:

　　0.5 kg (1.1 lbs), shipping weight 1 kg (2.2 lbs)

　　*Nominal values determined in accordance with ASTM standard procedures. Specifications subject to change without notice.