Anemometer Kestrel 3500 is a new generation device for weather monitoring (new implementation from the end of year 2004). This pocket size electronic device is used for measurement of wind speed, temperature, wind chill dew point temperature, wet bulb thermometer temperature (psychrometer), relative humidity, altitude, atmospheric pressure and heat stress index.
The anemometer’s impeller of very light structure, has precise, sapphire bearings, what assures accurate wind measurement also with small air speed. In case of damage the impeller can be easily replaced by a user.
The anemometer has an option of memorising one last result (function data hold).
Combining of an anemometer and a thermometer allows calculation through a built in device microprocessor an additional parameter–wind chill. The device, apart from a current wind speed, allows on reading maximum wind gust and average in various units.
The anemometer Kestrel 3500 has easy to read LCD display, which is adapted to showing chosen parameters.
The device is powered from a lithium battery (tablet ), which assures continuous work of the device through 400 hours. The device switches off automatically its power supply, if no key button is used for more than 15 minutes.
The anemometer is made out of plastic, and its electronic elements are fully protected from moisture. The device floats, if it is accidentally dropped into water.
The device is equipped with a hard case and a wrist or a neck lanyard (protecting the device from being dropped during exploitation).
|MEASUREMENT OF AIR
|Scope of measurement||0,3...40 m/s|
|Measurement uncertainty (for a component in a
||+/- 3% of a reading or +/- 0,1 m/s|
|Underrating indications for wind tilted from a device’s axis||-1%||for 5° angle|
|-2%||for 10° angle
|-3%||for 15° angle
||<2%||after 100 hours of work
at 7 m/s speed
||0,1||kt, m/s, km/h, mph|
|1||FPM||up to 1999 FPM|
|10||FPM||from 2000 FPM|
|Speed measurement result
||current||average from the last 3 seconds|
||an average from the moment of switching on the power supply|
|maximum||3-second wind gusts
from the moment of switching on the power supply
|Choice of result units
||kt (knots), m/s, km/h, mph (miles per hour), FPM (foot per minute), Beaufort degrees|
|Scope of air temperature measurement||-29...+70 °C|
|Measurement uncertainty of air temperature and wind chill||+/- 1 °C|
|Measurement uncertainty of dew point temperature
||+/- 2 °C|
|Measurement uncertainty of heat stress index||+/- 3 °C|
|Measurement resolution||0,1 °C|
|Temperature measurement result reading
|wind chill, heat stress index temperature
|Choice of result units
||degrees C, F|
||typically +/- 5 %, up to +/- 15 %|
|Scope of measurement||5...95 %|
|Measurement resolution||0,1 %|
||+/- 2 %||after 24 months|
|Response time||1 min.|
|ATMOSPHERIC PRESSURE MEASUREMENT
||+/- 3 hPa||in the temperature scope: -10°C...+60°C|
|Measurement resolution||0,1 hPa||in the scope: 870... 1080 hPa|
|0,01 inch Hg||in the scope: 25.7...31.9 cali Hg|
||+/- 1 hPa||after 12 months|
|Measurement resolution||1 m||in the scope: -500 ... 9000|
|3 ft (foot)||in the scope: -1600...30000|
|Degree of casing protection
||IP67 (waterproof with immersion up to 1 m in depth), floats on the water|
|Scope of work temperatures
|Scope of storage temperatures
|Battery work time
|Automatic power supply switch off
||after 45 minutes|
|Overall outside measurements
||122 x 42 x 20 mm|