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Anemometer (Wind Speed)
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The Anemometer is used for the measurement of wind velocity. The TruTrack anemometer is manufactured from stainless steel and anodized aluminium so as to provide minimum maintenance and maximum reliability.

Three Cup Anemometer specification:

  • Range 0~55 m/s 
  • Accuracy ± 2%
  • Start Speed 1.5 m/s
  • Cable Length 10 metres

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The Anemometer can be supplied with a  Pulse (switch closure) or 4 to 20mA Output.
The 3 Cup Anemometer is normally supplied but if low speed accuracy is required we also manufacture a 6 Cup version.

3 Cup Anemometer

 

 6 Cup Anemometer

 
Pulse Output
Order Code WS3-PS
2 pulses = 1 meter of wind run

 

 Pulse Output
Order Code WS6-PS
3 pulses = 1 meter of wind run
4 to 20mA Output
Order Code WS3-CL
4mA = 0 meters/second
20mA = 60 meters/second

 

 4 to 20mA Output
Order Code WS6-CL
4mA = 0 meters/second
20mA = 80 meters/second

It can be supplied free standing (as above)
or on a Base Mounting Plate
or attached to a L Bar or T Bar Equipment Mounting Arm (as shown on left)

We also have a six cup Anemometer available if you require lower starting speeds.

The T Bar is specifically designed to give good separation between wind speed anemometers and wind vanes. The total Length of the T bar is 800mm. The bar is 41mm U section and is supplied with a plastic capping strip to cover the underside of the arm and two end caps. The Arm has an attachment plate with holes that can be used for mounting to 50mm (2inch) or 25mm (1inch) diameter pipe or bolting to posts or buildings. The arm is supplied complete with two 50mm (2inch) U bolts TBar_LBar_400x300.JPG (18245 bytes)
3 Cup Anemometer
Wind Speed (m/sec) = Pulse per Sec / 2 + 0.65

6 Cup Anemometer
Wind Speed (m/sec) = Pulse per Sec / 3 + 0.4

Anemometer Dimensions

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Anemometer Wind Tunnel Test Results

ANEMOMETER CALIBRATION REPORT 
 
DEPARTMENT OFMECHANICAL ENGINEERING 
UNIVERSITY OF CANTERBURY 
CHRISTCHURCH 1 NEW ZEALAND
PHONE (03) 3667001 		 Date: 8/11/1996
 
CLIENT NAME: 
Malcolm Barth 
45 Flockton Street 
CHRISTCHURCH 		 INSTRUMENT: 
CUP ANEMOMETER
CONDITION : Prototype
 
P mBar Atmospheric mB 1010.5 Atm Pressure Correction=SQRT(1013.25/P) (1)
t degC 19 Temp Correction=SQRT((273+t)/288.15) (2)
K Speed 0.997 Factor Correction=SQRT(1/K) (3)
 
True Velocity = 4.0014*(1)*(2)*(3)*SQRT(H) 
 
Instrument reading = (output frequency / 2) + 0.65 
 
  WINDTUNNEL READING  INSTRUMENT READING
Test  Velocity Press H  True Velocity  Velocity Reading Error 
No  mm H2O m/s  m/s %
1 0.2 1.81 1.85 2.4
2 1 4.04 4.10 1.5
3 1.5 4.95 4.98 0.6
4 2 5.71 5.75 0.7
5 3 7.00 7.00 0.0 
6 4 8.08 8.05 -0.4
7 5 9.03 9.00 -0.4
8 6.1 9.98 9.95 -0.3
9 7.35 10.95 10.90 -0.5
10 8.35 11.67 11.60 -0.6
11 10 12.77 12.65 -1.0
12 15 15.65 15.50 -0.9
13 20 18.07 17.95 -0.6
14 30 22.13 21.90 -1.0
15 40 25.55 25.35 -0.8
16 50 28.56 28.35 -0.7
17 60 31.29 31.10 -0.6
18 70 33.80 33.70 -0.3
19 160 51.10 50.65 -0.9
 
ACCURACY OF TESTING: 2 to 4 m/s +/- 5% , 4 to 10m/s +/- 1.5% , 10 to 60 m/s +/- 1%