Anemometer

Simple, sturdy, and precise Heated Needle Anemometer

Affordable and accurate non-directional heated needle anemometer for low wind speeds.

 

The East 30 Sensors anemometer uses heat transfer to monitor air flow as it passes the needle. It is appropriate for many settings including:

Air flow monitoring in greenhouses

Point wind speed determination

Wind speed determination in all types of plant canopies

Low wind speed monitoring

The East 30 Sensors anemometer is designed to be simple and robust while still providing very accurate data. This sensor consists of a thermistor and a heating element to measure the heat transfer associated with air movement across the needle. This is then calibrated to wind speed. Accuracy will decrease significantly if the needle is wet or dirty.

 

 

Specifications

  • Range: 0 to 15 m/sec

  • Accuracy: ±20 cm/s

  • Dimensions:

    • Head is 25 x 13 x 13 mm

    • Needle is 60mm x 1.27mm diameter

  • Temperature Sensor: 10K Precision Thermistor

  • Material: Epoxy and Delrin Head, stainless steel needle

  • Cable length: 2m standard (additional cable length available upon request)

 

The Heated Needle Anemometer is designed to be robust and reliable, especially in low wind speeds. It is intended to be used with a Campbell Scientific Datalogger. For more information see datalogger compatibility or if you have no experience with these dataloggers see Turn-Key Solutions.

 

The Heated Needle Anemometer is calibrated in the factory, and then is ready to use in conjunction with a Campbell Scientific datalogger. No additional accessories are needed.

 

Theory

 The East 30 Sensors Anemometer uses a durable configuration with a stainless-steel needle to measure windspeed. This sensor uses the heat transfer to determine non-directional windspeed across the needle in a range from 0-15 m/sec. To take a measurement, a baseline temperature is recorded followed by a precisely timed heating step, during which temperature is recorded. The difference is then taken between the baseline temperature and the final temperature. By using the same heating time and monitoring the change in temperature, wind speed can be calculated using the provided factory calibration.

Publications

Bland, W. L., Norman, J. M., Campbell, G. S., Calissendorf, C., & Miller, E. E.  A transiently heated needle anemometer. Agricultural and Forest Meteorology Volume 74, Issues 3–4, May 1995, Pages 227-235

R. M. Aiken,* D. C. Nielsen, and L. R. Ahuja. Scaling Effects of Standing Crop Residues on the Wind Profile. Agronomy Journal, Vol. 95, July–August 2003

Savage, M. J. (2014) Microclimate conditions in ventilated wet-walled greenhouses in a subtropical climate: spatial variability, South African Journal of Plant and Soil, 31:3, 137-143, DOI: 10.1080/02571862.2014.921942

support@east30sensors.com   | 1 (509) 334-3016