Superior data availability accuracy wind directions patented thre

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Superior data availability accuracy wind directions patented thre

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WS425 Ultrasonic Wind Sensor Critical Wind Measurement Applications
Superior data availability accuracy
wind directions patented three transducer layout maintenance needed Theoretical mean time between failures (MTBF) years Effects temperature, humidity pressure fully compensated Large transducer heads insensitive rain RS232/485/422, SDI-12 analog outputs Operates with 10.15 VDC, additional required heated model Stainless steel standard sensor material Field verification device available mounted upside down National Weather Service's choice ASOS mechanical sensor replacement program
WS425 defines standard accurate wind measurement.
Vaisala Ultrasonic Wind Sensor WS425 gives meteorologists alternative vane mechanical sensors. With continuous data availability, WS425 also ideal variety wind measurement applications aviation, road railway safety energy production.
Measurement based ultrasound
WS425 uses ultrasound determine horizontal wind speed direction. measurement based transit time, time takes ultrasound travel from transducer another, depending wind speed. transit time measured both directions pair transducer heads. Using measurements each three ultrasonic paths angles each other, WS425 computes wind speed direction. wind measurements calculated that completely eliminates effects altitude, temperature humidity.
Standard heated models
heated model thermostatically controlled heaters transducer heads prevent freezing rain snow build- standard model operates with current 10.15 supply. heated model, additional supply used heating.
Accurate maintenancefree
WS425 moving parts, resistant contamination corrosion. addition improving accuracy reliability data wind conditions climates, WS425 eliminates on-demand periodic maintenance.
Outputs
SDI-12 provides most extensive commands calculations. standard RS-232/485/422 protocol supports NMEA three other message formats. Analog outputs available option.
Vaisala Product Catalog 2003-2004
Ref. B210379en rev.
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 (0.144 mph, 0.125 knots) 0.56 (0.124 mph, 0.107 knots) virtually zero virtually zero (0.1 mph, knots, km/h) 0.135 (±0.3 mph, ±0.26 knots) reading, whichever greater 0.360° virtually zero virtually zero
General
Operating power supply heated model Operating temperature WS425 non-heated WS425 heated Material body sensor arms transducer heads Dimensions height width depth Weight 10.15 VDC, typical (analog) -40.+55 (-40.+131 -55.+55 (-67.+131 stainless steel (AISI 316) stainless steel (AISI 316) silicone rubber (14") (10") (12") (3.7 lbs)
Wind direction
Measurement range Starting threshold Delay distance Resolution Accuracy (wind speed over m/s)
Outputs
Digital outputs type RS232, RS422 RS485, four different message formats adjustable from 1200 19200 bit/s RS232: seconds
Complies with standard EN61326-1:1997 Am1:1998; Generic Environment
Accessories
Cable supporting analog outputs, Cable supporting RS-232 outputs, Cable supporting RS-485/422 outputs, Cable supporting SDI-12 outputs, Adapter 30-35 1/4") diameter vertical tube Adapter 1/4") diameter vertical tube Field verifier ZZ45204 ZZ45203 010411 WS425CABSDI WS425FIX30 WS425FIX60 WS425VERIFIER
rate available averages SDI-12 Standard Data Interface type wires ground, signal supply rate fixed 1200 bit/s available averages 3600 seconds Analog outputs wind speed frequency Hz/mph voltage mV/mph output impedance kohm wind direction simulated potentiometer represents 0.359° reference voltage 1.0.4.0 output impedance kohm
Response characteristics
maximum reading rate sonic measurement time signal processing time response time second 0.15 0.35
Specifications subject change without prior notice. ©Vaisala
Vaisala Product Catalog 2003-2004
Ref. B210379en rev.

Superior data availability accuracy wind directions patented thre

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