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P.O. Box 26, FIN-00421 Helsinki, FINLAND Tel: +358 9 894 91 Fax: +358 9 8949 2485 Email: industrialsales@vaisala.com www.vaisala.com
WS425 Ultrasonic Wind Sensor for Critical Wind Measurement Applications
Features/Benefits
* Superior data availability and accuracy * * * * * * * * * *
in all wind directions due to the patented three transducer layout No maintenance needed Theoretical mean time between failures (MTBF) 26 years Effects of temperature, humidity and pressure fully compensated Large transducer heads are insensitive to rain RS232/485/422, SDI-12 and analog outputs Operates with 10...15 VDC, additional 36 VDC required for heated model Stainless steel as standard sensor material Field verification device available Can be mounted upside down US National Weather Service's choice for ASOS mechanical sensor replacement program
The WS425 defines the new standard of accurate wind measurement.
The Vaisala Ultrasonic Wind Sensor WS425 gives meteorologists an alternative to the cup and vane mechanical sensors. With its continuous data availability, the WS425 is also ideal for a variety of wind measurement applications in aviation, road and railway safety and energy production.
Measurement based on ultrasound
The WS425 uses ultrasound to determine horizontal wind speed and direction. The measurement is based on transit time, the time it takes for the ultrasound to travel from one transducer to another, depending on the wind speed. The transit time is measured in both directions for a pair of transducer heads. Using two measurements for each of the three ultrasonic paths at 60 angles to each other, the WS425 computes the wind speed and direction. The wind measurements are calculated in a way that completely eliminates the effects of altitude, temperature and humidity.
Standard and heated models
The heated model has thermostatically controlled heaters in the transducer heads to prevent freezing rain or snow build- up. The standard model operates with a low current 10...15 V supply. For the heated model, an additional 36 V supply is used for heating.
Accurate and maintenancefree
The WS425 has no moving parts, and is resistant to contamination and corrosion. In addition to improving accuracy and the reliability of data in all wind conditions and climates, the WS425 eliminates on-demand and periodic maintenance.
Outputs
SDI-12 provides the most extensive set of commands and calculations. The standard RS-232/485/422 protocol supports NMEA and three other message formats. Analog outputs are available as an option.
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Vaisala Product Catalog 2003-2004
Ref. B210379en rev. A
WS425
WIND
Technical Data
Wind speed
Measurement range serial output analog output Starting threshold Delay distance Resolution Accuracy (range 0...65 m/s) 0...65 m/s (0...144 mph, 0...125 knots) 0...56 m/s (0...124 mph, 0...107 knots) virtually zero virtually zero 0.1 m/s (0.1 mph, 0.1 knots, 0.1 km/h) 0.135 m/s (0.3 mph, 0.26 knots) or 3% of reading, whichever is greater 0...360 virtually zero virtually zero 1 2
General
Operating power supply and for heated model Operating temperature WS425 non-heated WS425 heated Material body sensor arms transducer heads Dimensions height width depth Weight 10...15 VDC, 12 mA typical (analog) 36 VDC 10 %, 0.7 A -40...+55 C (-40...+131 F) -55...+55 C (-67...+131 F) stainless steel (AISI 316) stainless steel (AISI 316) silicone rubber 355 mm (14") 250 mm (10") 286 mm (12") 1.7 kg (3.7 lbs)
Wind direction
Measurement range Starting threshold Delay distance Resolution Accuracy (wind speed over 1 m/s)
Outputs
Digital outputs type RS232, RS422 or RS485, four different message formats adjustable from 1200 to 19200 bit/s RS232: 1 to 9 seconds
Complies with EMC standard EN61326-1:1997 + Am1:1998; Generic Environment
Accessories
Cable supporting analog outputs, 10 m Cable supporting RS-232 outputs, 10 m Cable supporting RS-485/422 outputs, 10 m Cable supporting SDI-12 outputs, 10 m Adapter for 30-35 mm (1 1/4") diameter vertical tube Adapter for 60 mm (2 1/4") diameter vertical tube Field verifier ZZ45204 ZZ45203 010411 WS425CABSDI WS425FIX30 WS425FIX60 WS425VERIFIER
bit rate available averages SDI-12 Standard Data Interface type 3 wires for ground, signal and supply bit rate fixed 1200 bit/s available averages 1 to 3600 seconds Analog outputs wind speed frequency 5 Hz/mph voltage 8.0 mV/mph output impedance 10 kohm wind direction simulated potentiometer 0...V ref represents 0...359 reference voltage 1.0...4.0 V output impedance 24 kohm
Response characteristics
maximum reading rate sonic measurement time signal processing time response time 1 per second 0.2 s 0.15 s 0.35 s
Specifications subject to change without prior notice. (c)Vaisala Oyj
Vaisala Product Catalog 2003-2004
Ref. B210379en rev. A
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