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How to choose an anemometer for your application!



  Choosing an anemometer can be tricky. There are lots of different styles, and they all have different functionality. In this month’s newsletter we are going to look at the 4 main types of anemometer, their pros and cons and how you can choose the anemometer that is best suited to your requirements.

Cup anemometers:
Cup anemometers are the most recognisable style of anemometer. They generally consist of three cups that rotate around an axis. When the wind blows, the cups rotate and a reed switch or a Hall effect sensor is generally used to measure this rotation. The rotation is then converted to a wind speed reading.
 
Pros
-They don’t need to be pointed towards the source of the wind
-Highly reliable and rugged

Cons
-Can have a high starting velocity (not well suited to very low measurements)
-Can overestimate wind speed in turbulent conditions
-Moving parts will wear out over time

Our most popular cup anemometer


Vane anemometers:
Vane anemometers work in a similar way to cup anemometers but the sensors are shaped like a windmill or turbine. Vane anemometers must be pointed towards the wind to read accurately. They are popular for HVAC applications.

Pros
-Can handle dirtier environments and more rugged than hot wire anemometers
-Can handle higher velocities than hot wire anemometers

Cons
-Must be pointed towards source for accurate readings
-Smaller vanes can have a high starting velocity
-Moving parts will wear out over time

Our most popular Vane Anemometer

Thermo-anemometer with 100mm vane probe - LV110S

Hot wire anemometers
Hot wire anemometers work by heating up a fine wire above ambient temperatures and then measuring how much current is required to keep it at a constant temperature, or measuring how much the temperature changes under constant current. The heat loss is then converted into an air velocity reading.

Pros
-Low starting threshold
-Small sensor size
-No moving parts
-High accuracy and quick response

Cons
-Not suited to areas with rapidly fluctuating temperature
-Large particles in the air can damage the sensor

Our most popular hot wire anemometer

Thermo-anemometer with hotwire - VT110S

Pitot Tube anemometers
Pitot tube anemometers measure pressure and use this to calculate air velocity. A Pitot tube is used for measuring the total pressure of the incoming air and a static tube is used to measure the static pressure in the air flow. The meter then calculates the air velocity using the Bernoulli equation.

Pros
-Can handle very high air velocity and temperature
-Pitot tubes can be quite small and are easy to insert into duct work.
-No moving parts
-Quick response

Cons
-Not suited to very low air velocity
-Not well suited to fluctuating flow
-Must be pointed at direction of air flow

Our most popular pitot tube anemometer

PitotTube Anemometer with Differential Manometer - Extech HD350

If you would like to discuss our range of anemometers further or have any further questions please feel free to contact one of our friendly Scientists via email or phone on 1300 737 871. Daniel Craig McGaffin


See our other newsletter articles here! 
                

Contact our expert scientists now to get the right meter or data logger to suit your needs and discuss your project. 


Phone: 1300 737 871
Email:
customer-service@instrumentchoice.com.au