Vaisala WA15 Technical data
www.vaisala.com
WA15 Wind Set for High Performance
Wind Measurement
per revolution. This generates a pulse output from the
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 WAV151 is a counter-balanced, low-threshold,
optoelectronic wind vane. Infrared LEDs and
phototransistors are mounted on six orbits on each
side of a 6-bit GRAY-coded disc. Turned by the vane,
the disc creates changes in the code received by the
phototransistors. The output code resolution is ±2.8°.
The WA15 is based on accurate sensors installed on a large
crossarm. It is designed for demanding wind measurement
applications.
With a proven track record of successful installations, the
Vaisala Wind Set WA15 has earned its reputation as the
industry standard in the wind sensor market.
The WA15 consists of a Vaisala Anemometer WAA151, a
Vaisala Wind Vane WAV151, an optional crossarm, a power
supply and cabling.
Anemometer with excellent linearity
The WAA151 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
Features/Benefits
High-performance wind measurement set
▪
Long and successful track record in meteorological
▪
applications
Accurate wind speed and direction measurement
▪
Low measurement starting threshold
▪
Conical anemometer cups provide excellent
▪
linearity
Heated shaft prevents bearings from freezing
▪
Heated bearings withstand cold weather
Heating elements in the shaft tunnels of both the
anemometer and vane keep the bearings above freezing in
cold climates.
Complete package available
The anemometer and vane are designed to be mounted on
Vaisala crossarms.
The WHP151 power supply provides the operating and
heating power needed for the WA15. The power supply,
as well as the signal and power cables are available as
options.
Technical data
Vaisala Wind Set WA15
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
Crossarm and serial RS485 transmitter WAC155
Serial RS485 transmitter card WAC155CB
Power supply WHP151
Set of bearings and gasket 16644WA
Cup assembly 7150WA
Tail assembly 6389WA
Technical data
Vaisala Anemometer WAA151
Wind speed
Measurement range 0.4 ... 75 m/s
Starting threshold < 0.5 m/s *
Distance constant 2.0 m
Characteristic transfer function U = 0.328 + 0.101 × 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 = 9.5 ... 15.5 VDC, 20 mA typical
Heating power supply AC or DC 20 V, 500 mA nominal
Output 0 ... 750 Hz square wave
Transducer output level
< +5 mA high state > Uin-1.5 V
with I
out
> –5 mA low state < 2.0 V
with I
out
Settling time after power turn-on < 30 µs
Plug 6-PIN MIL-C-26482 type
Cabling 6-wire cable through crossarm
Recommended connector at cable end SOURIAU MS3116F10-6P
Operating temperature with heating -50 ... +55 °C (-58 ... +131 °F)
Storage temperature -60 ... +70 °C (-76 ... +158 °F)
Material
housing AlMgSi, grey anodized
cups PA, reinforced with carbon fibre
Dimensions 240 (h) × 90 (Ø) mm
Swept radius of cup wheel 91 mm
Weight 570 g
Vaisala Wind Vane WAV151
Wind direction
Measurement range at wind speed 0.4 ... 75 m/s 0 ... 360°
Starting threshold <0.4 m/s
Resolution ±2.8°
Damping ratio 0.19
Overshoot ratio 0.55
Delay distance 0.4 m
Accuracy better than ±3°
General
Operating power supply Uin = 9.5 ... 15.5 VDC, 20 mA typical
Heating power supply AC or DC 20 V, 500 mA nominal
Output code 6-bit parallel GRAY
Output levels
< +5 mA high state > Uin –1.5 V
With I
out
> –5 mA low state < 1.5 V
With I
out
Settling time after power turn-on < 100 µs
Plug 10-PIN MIL-C-26482 type
Cabling 10-wire cable through crossarm
Recommended connector at cable end SOURIAU MS3116F12-10P
Operating temperature with heating -50 ... +55 °C (-58 ... +131 °F)
Storage temperature -60 ... +70 °C (-76 ... +158 °F)
Material
housing AlMgSi, grey anodized
wave Alsi 12 anodized
Dimensions 300 (h) × 90 (Ø) mm
Swept radius of vane 172 mm
Weight 660 g
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 +
Am2:2001; 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 error vs. speed with the "simple transfer function" used.
RANGE (m/s) 0-3 3-10 10-17 17-24 24-31 31-37 37-44 44-51 51-58 58-65
ERROR (m/s) -0.4 -0.3 -0.2 -0.1 0.0 +0.1 +0.2 +0.3 +0.4 +0.5
For more information, visit
www.vaisala.com or contact
us at sales@vaisala.com
Test compliance
Wind tunnel tests ASTM standard method D 5366-93
(for starting threshold, distance constant, transfer function)
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;
Am2:2001; Generic Environment
Ref. B210382EN-B ©Vaisala 2009
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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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