Vaisala WA25 Technical data
WA25 Wind Set
The WA25 resists snow build-up and ice formation. The result
is accurate wind measurement in cold environments.
The Vaisala Wind Set WA25 is a high-quality cup and vane
wind measurement station designed for arctic conditions.
The WA25 consists of a Vaisala Anemometer WAA252, a
Vaisala Wind Vane WAV252, an optional crossarm, 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.
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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
The WAA252 is a fast-response, low-threshold anemometer.
Three lightweight, conical cups mounted on the cup wheel,
provide excellent linearity over the entire operating range,
up to 75 m/s.
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 (e.g., 246 Hz = 24.6 m/s). However, for the highest
accuracy, the characteristic transfer function should be
used to compensate for starting inertia.
(See technical data.)
Sensitive wind vane
The WAV252 is a counterbalanced, low threshold,
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 crossarms.
Features/Benefits
Non-freezing, high-performance wind set
▪
Cups and vane, sensor bodies and bearings are
▪
heated to prevent snow buildup and ice formation
Accurate wind speed and direction measurement
▪
Low measurement starting threshold
▪
Conical anemometer cups provide excellent
▪
linearity
Technical data
Vaisala Wind Set WA25
Options and accessories
Crossarm and termination box WAC151
16-lead signal cable ZZ45048
6-lead power cable ZZ45049
Crossarm and analog transmitter WAT12
6-lead cable for signal and power ZZ45049
Power supply WHP25
Set of bearings and gasket 16644WA
Heated cup assembly WA35066
Heated tail assembly WA35336
Technical data
Vaisala Anemometer WAA252
Wind speed
Measurement range 0.4 ... 75 m/s
Starting threshold < 0.5 m/s *
Distance constant 2.7 m
Characteristic transfer function U = 0.39 + 0.10 × R
(where U = wind speed [m/s], R = output pulse rate [Hz])
Accuracy (within range 0.4 ... 60 m/s)
with characteristic transfer function ± 0.17 m/s **
with transfer function U = 0.1 × R ± 0.5 m/s ***
General
Operating power supply Uin = 24 VDC ± 10%, max. 3.2 A
Typical power consumption (U
Output 0 ... 750 Hz square wave
Transducer output level
< +5 mA high state > 11V
with I
out
> –5 mA low state < 1.5V
with I
out
Plug 6-PIN MIL-C-26482 type
Recommended connector at cable end SOURIAU MS3116F10-6P
Operating temperature -55 ... +55 °C (-67 ... +131 °F)
Storage temperature -60 ... +70 °C (-76 ... +158 °F)
Material
housing AlMgSi, grey&black anodized
cups PC, reinforced with glassfibre
Dimensions 264 (h) × 90 (Ø) mm
Swept radius of cup wheel 91 mm
Weight 800 g
= 24 VDC)
in
72 W below +2 °C (+36 °F) (heating on)
1 W above +6 °C (+43 °F) (heating off)
Vaisala Wind Vane WAV252
Wind direction
Measurement range 0 ... 360°
Starting threshold < 0.4 m/s
Resolution ±2.8°
Damping ratio 0.3
Overshoot ratio 0.4
Delay distance < 0.5 m
Accuracy better than ±3°
General
Operating power supply 24 VDC ± 10%, max. 2.1 A
Typical power consumption (U
Output code 6-bit parallel GRAY
Output levels
< +3 mA high state > 11V
With I
out
> –3 mA low state < 1.5V
With I
out
Plug 10-PIN MIL-C-26482 type
Recommended connector at cable end SOURIAU MS3116F12-10P
Operating temperature -55 ... +55 °C (-67 ... +131 °F)
Storage temperature -60 ... +70 °C (-76 ... +158 °F)
Material
housing AlMgSi, grey&black anodized
vane carbon fibre + glassfibre
Dimensions 355 (h) × 90 (Ø) mm
Swept radius of vane 218 mm
Weight 850 g
= 24 VDC)
in
50 W below +2 °C (+36 °F) (heating on)
1 W above +6 °C (+43 °F) (heating off)
Test compliance
Wind tunnel tests ASTM standard method D5096-90
Exploratory vibration test MIL-STD-167-1
Humidity test MIL-STD-810E, Method 507.3
Salt fog test MIL-STD-810E, Method 509.3
Complies with EMC standard EN61326-1:1997 + Am1:1998;
Generic Environment
* Measured with cup wheel in position least favoured by flow
direction. Optimum position gives approx. 0.35 m/s threshold.
** Standard deviation
***Typical errors vs. speed with "the simple transfer function" used.
RANGE (m/s) 0-5 5-10 10-15 15-20 20-24 24-29 29-34 34-39 39-44 44-48 48-58
ERROR (m/s) -0.2 -0.1
+0.0 +0.1 +0.2 +0.3 +0.4 +0.5 +0.6 +0.7 +0.8
For more information, visit
www.vaisala.com or contact
us at sales@vaisala.com
Test compliance
Wind tunnel tests ASTM standard method D5366-93
Exploratory vibration test MIL-STD-167-1
Humidity test MIL-STD-810E, Method 507.3
Salt fog test MIL-STD-810E, Method 509.3
Complies with EMC standard EN61326-1:1997 + Am1:1998;
Generic Environment
Ref. B210383EN-C ©Vaisala 2010
This material is subject to copyright protection, with all
copyrights retained by Vaisala and its individual partners. All
rights reserved. Any logos and/or product names are trademarks
of Vaisala or its individual partners. The reproduction, transfer,
distribution or storage of information contained in this brochure
in any form without the prior written consent of Vaisala is strictly
prohibited. All specifications — technical included — are subject
to change without notice.
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