Wind Set WA25

Measure wind speed and direction accurately

Model: WA25
Manufacturer: Vaisala – Finland

Features

  • Non-freezing, high-performance wind set
  • Cups, vane, sensor bodies, and bearings are heated to prevent snow build-up and ice formation
  • Accurate wind speed and direction measurement
  • Low measurement starting threshold
  • Conical anemometer cups provide excellent linearity
Category:

Vaisala Wind Set WA25 is a high-quality cup and vane wind measurement station designed for arctic conditions. WA25 consists of Vaisala Anemometer WAA252, Vaisala Wind Vane WAV252, an optional cross-arm, a power supply, and cabling.

Heating provides resistance to snow and ice

Most of the heating power is consumed where it is needed most – in the cups and vane. Foil heaters, integrated into the cups and vane, prevent snow buildup and ice formation.

Heating power is also supplied to the sensor shafts, bearings, and bodies. This keeps the sensor bodies free of ice, which is important for maintaining the aerodynamic performance.

Anemometer with excellent linearity

WAA252 is a fast-response, lowthreshold anemometer. Three lightweight, conical cups mounted on the cup wheel provide excellent linearity over the entire operating range, up to 75 m/s (168 mph).

A wind-rotated chopper disc attached to the shaft of the cup wheel cuts an infrared light beam 14 times per revolution. This generates a pulse output from a phototransistor.

The output pulse rate is directly proportional to wind speed (for example, 246 Hz = 24.6 m/s). However, for the highest accuracy, the characteristic transfer function must be used to compensate for starting inertia

Sensitive wind vane

WAV252 is a counterbalanced, lowthreshold, optoelectronic wind vane providing a 6-bit GRAY coded message. Turned by the vane, the disc creates changes in the code received by the phototransistors. The code is changed in steps of 5.6°.

Complete package available

The anemometer and vane are designed to be mounted on Vaisala cross-arms.

WAA252 measurement performance

 

Measurement range 0.4 … 75 m/s (0.9 … 168 mph) 
Starting threshold < 0.5 m/s (1.1 mph) 1)
Distance constant 4 m (13 ft 1 in)
Characteristic transfer function Uf (wind speed) = 0.328 + 0.101 × R (output pulse rate) 
Transducer output level
(Iout < +5 mA) High state > 11 V
(Iout > -5 mA) Low state < 1.5 V
Accuracy within 0.4 … 60 m/s (0.9 … 134 mph)
With characteristic transfer function (standard deviation) ±0.17 m/s (0.38 mph)
With simple transfer function Uf = 0.1 × R ±0.5 m/s (1.12 mph)2)

 

1) Measured with cup wheel in position least favored by flow direction. Optimum position gives approx. 0.35 m/s (0.78 mph) threshold. 

2) Typical error vs. speed with the simple transfer function used. 

 

WAA252 operating environment

 

Operating temperature -55 … +55 °C (-67 … +131 °F)
Storage temperature -60 … +70 °C (-76 … +158 °F)
Wind tunnel tests  ASTM standard method D5366-90

 

WAA252 mechanical specifications

 

IP rating IP65
Dimensions (H × Ø) 264 × 90 mm (10.39 × 3.54 in)
Swept radius of cup wheel 91 mm (3.58 in) 
Weight  0.8 kg (1.76 lb)
Materials  Housing: AlMgSi, gray and black anodized Cup: PC, reinforced with glass fiber

 

WAA252 inputs and outputs

 

Operating power supply Uin = 24 V DC ± 10%, max. 3.2 A
Output  0 … 750 Hz square wave
Recommended connector at cable end SOURIAU MS3116F10‑6P
Plug 6-PIN MIL-C-26482 type
Typical power consumption (Uin = 24 V DC)
Below +2 °C (+36 °F) (heating on) 72 W
Above +6 °C (+43 °F) (heating off) 1 W

 

WAV252 measurement performance

 

Measurement range 0 … 360° 
Starting threshold < 0.4 m/s (0.9 mph)
Resolution ±2.8°
Damping ratio 0.3
Overshoot ratio 0.4
Delay distance < 0.5 m (1 ft 8 in)
Accuracy Better than ±3°
Output 6-bit parallel GRAY code
Transducer output level
(Iout < +3 mA) High state > 11 V
(Iout > -3 mA) Low state < 1.5 V

 

WA25 spare parts and accessories

 

Service kit for one WA15/25 sensor (set of bearings and gasket)  16644WA
Cross-arm and serial RS-485 transmitter WAC155 
Component board for WAC155 WAC155CB
Heated cup assembly WAA252 WA35066 
Heated tail assembly WAV252 WA35336
Connector WAA151, WAA252 230118
Connector WAV151, WAV252 230119
Cross-arm and termination box WAC151
16-lead signal cable (10 m) for WA15/25, open leads on both ends ZZ45048
6-lead heating power cable (10 m) for WA15/25, open leads on both ends ZZ45049
Special length 16-lead signal cable for WA15/25, open leads on both ends ZZ45048SPEC
Special length 6-lead heating power cable for WA15/25, open leads on both ends ZZ45049SPEC
Special length 6-lead heating power cable for WA15/25, open leads on both ends ZZ45049SPEC
Sensor cable for WAA151/252 0.8 m (31.5 in), open lead on one end (6 wires), connector 230118 on other end ZZ45036
Sensor cable for WAV151/252 0.8 m (31.5 in), open lead on one end (10 wires), connector 230119 on other end ZZ45037
Special length sensor cable for WAA151/252, open lead on one end (6 wires), connector 230118 on other end ZZ45036SPEC
Special length sensor cable for WAV151/252, open lead in one side (10 wires) and connector 230119 in another side ZZ45037SPEC
Cross-arm and analog transmitter WAT12
Component board for WAT12 16637WA
Attachment hardware for WAA151/252 and WAV151/252 16546WA
Power supply for WA25 WHP25
Power board for WHP25 power supply WA35078

 

WAV252 operating environment

 

Operating temperature -55 … +55 °C (-67 … +131 °F)
Storage temperature ‑60 … +70 °C (-76 … +158 °F)
Wind tunnel tests ASTM standard method D5366-93

 

WAV252 mechanical specifications

 

IP rating IP65
Dimensions (H × Ø) 355 × 90 mm (13.98 × 3.54 in)
Swept radius of vane 218 mm (8.58 in)
Weight 0.85 kg (1.87 lb)
Materials Housing: AlMgSi, gray and black anodized Vane: Carbon fiber and glass fiber

 

WAV252 inputs and outputs

 

Operating power supply Uin = 24 V DC ± 10%, max. 3.2 A
Output code 6-bit parallel GRAY
Recommended connector at cable end  SOURIAU MS3116F12-10P
Plug 6-PIN  MIL-C-26482 type
Typical power consumption (Uin = 24 VDC)
Below +2 °C (+36 °F) (heating on) 50 W
Above +6 °C (+43 °F) (heating off) 1 W

 

WA25 compliance

 

Compliance marks CE, China RoHS

Wind Set WA25

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