Wind Sensor First class advanced



For site assessment and measurement of power
performance of wind energy power plants.
Class A, B and S accredited according to
IEC 61400-12-1 (2005-12) ISO 17713-1,
Measnet; Classcup

• High quality anemometer class 0.5
• Optimised dynamic behaviour even at high turbulence
• minimum over-speeding
• excellent linearity r > 0,99999
• low power
• high survival speed
• excellent price performance ratio

patented design EP 1 489 427, DE 103 27 632, EP 1 398 637

The wind transmitter is designed for the acquisition of the horizontal component of the wind speed in the fields of meteorology and environmental measuring technology. The measuring value is available at the outputs in digital form It can be transmitted to display instruments, recording instruments, dataloggers, as well as to process control systems. For winter operation the instrument is equipped with an electronically regulated heating, which guarantees a smooth running of the ball bearings, and prevents the shaft and slot from icing-up.

2. Construction and Mode of Operation
A low-inertia cup star with 3 cups, made of carbon-fibre-reinforced plastic, is set into rotation by the wind. The rotation is scanned opto-electronically, and is converted into a square wave signal. The frequency of this signal is proportional to the number or rotations. Depending on the supply voltage, the output signal ranges between maximal output voltage and ground or a potential (life-zero), lifted by approx. 1,2 V. The supply of the electronics can be done by DC-voltage of 3,3 V up to 42 V at a very low current consumption. An AC- or DC-voltage of 24 V is intended for the separate supply of the optional heating. In all probability, the heating guarantees a trouble-free function of the Wind Transmitter First Class even under extreme meteorological icing-conditions.
The outer parts of the instrument are made of corrosion-resistant anodised aluminium. Highly effective labyrinth gaskets and O-rings protect the sensitive parts inside the instrument against humidity and dust. The instrument is mounted onto a mast tube; the electrical plug-connection is located in the transmitter shaft.

Order-No. 4.3351     with heating     without heating
.xx.000     frequency output: 0,3…75 m/s – 1082 hz
.xx.140     analogue output: 0,3…75 m/s – 0…20 mA
.xx.141     analogue output :0,3…75 m/s – 4… 20 mA
.xx.161    analogue output :0,3 …75 m/s – 0…10 V

Technical Data
Meas  range 0,3…75 m/s
Meas. instability (w/o calibration) 0,3…50 m/s < 1% of meas. value or < 0,2 m/s
Survival speed 80 m/s (min. 30 minutes)
Permissible Ambient condit. -50…+80 °C, all occurring situations of relative humidity (incl. dew moistening)
Output signal
Form rectangle
Frequency 1082 Hz @ 50 m/s
Amplitude is supply voltage, max. 15 V
Load R > 1 kΩ    (Push-pull output with 220 Ω in series)
C < 200 nF    (corresp. to length typical cable < 1km)
Linearity Correlation factor r between frequency and wind speed
y= 0,0462*f+0,21 typical
r > 0.999 99    (4…20 m/s)
Starting velocity < 0,3 m/s
Resolution 0,05 m wind run
Distance constant <3m (acc. To ASTM D 5096 – 96)
Inclined flow
Measuring value deviation Δv compared with stationary horizontal flow: Δv < 1 %
Wind velocity Wind velocity
Horizontal turbulence Intensity t <= 20%
Turbulence structure (rough country) r <= 0,8d
Average deviation from the horizontal flow ð <= 2°
Turbulent flow Deviation Δv turbulent compared with stationary horizontal flow -0.5% < Δv < +2% Frequency < 2 Hz
Classification According to IEC 61400-12-1 (2005-12)
Class A classification index A 0,9
Class B classification index B 3,0
Class S classification index S 0,5
wind load at 75 m/s approx. 100 N
Heating     Surface temperature of housing neck > 0 °C at 20 m/s up to –10 °C air temperature, at 10 m/s up to –20 °C using the THIES icing standard 012002 on the housing neck.
Heating regulated by temperature sensor.
Electrical supply for opto-electronic scanning
Voltage 3,3…42 V DC (galvanic isolation from housing)
Current 0,3 mA @ 3,3 V typical (w/o external load)< 0,5 mA @ 5 V (w/o external load)
Electrical supply for heating
Voltage 24 V AC/DC (galvanic isolation from housing)
Idling voltage max. 30 V AC, max. 42 V DC
Capacity 25 W
Connection 8-pole plug-connection for shielded cable in the shaft
Mounting Mounting on mast R 1″, for ex. DIN 2441 1½ ” with separate adaptor (option)
Weight approx. 0,5 kg
Protection IP 55 (DIN 40050)
 Reference number Specification
IEC 61000-6-2: 2005 Electromagnetic compatibility
Immunity for industrial environment
IEC 61000-6-3: 2006 Electromagnetic compatibility
Emission standard for residential, commercial and light industrial environments
IEC 61010-1: 2001 Safety requirements for electrical equipment for measurement, control and laboratory use.
Part 1: General requirements