WINDCAP Ultrasonic Wind Sensor WMT700

Accurate wind data even in variable winds, complex terrain, and other challenging conditions

Model: WMT700
Manufacturer: Vaisala – Finland


  • WMO and ICAO compliant
  • Data output rate 4 Hz and 8 Hz
  • Stainless steel structure
  • Maintenance-free
  • 3-transducer layout provides accurate data
  • Data format outputs: polar coordinates and vectors
  • Fully compensates effects of temperature, humidity, and pressure
  • Measurement range up to 90 m/s (201 mph)
  • Heating up to 250 W
  • IP66 and IP67
  • Large transducers provide high ultrasound power
  • Optional bird prevention kit
  • Wind gust calculated according to WMO guidelines
  • US National Weather Service and the FAA rely on Vaisala WINDCAPâ technology

WMT700 Series has been designed for professional use in meteorology, aviation, maritime, wind energy, and many other applications.

Vaisala WINDCAP Ultrasonic Wind Sensor WMT700 Series is a robust and reliable ultrasonic anemometer. It measures surface wind, which is one of the key parameters for meteorology and aviation. WMT700 series meets WMO CIMO Guide (WMO-No.8) and ICAO requirements.

Accurate and maintenancefree

WMT700 series has a durable full steel structure with welded arms, clear North indication, and one-point, quick bayonetstyle mounting. It has no moving parts, and it is resistant to contamination and corrosion.

It measures accurately and produces reliable data in demanding wind conditions and climates without periodic or on-demand maintenance. Selfdiagnostics and measurement validation are standard features. The 60-minute average is available for polar coordinates and vectors.

Measurement based on ultrasound

WMT700 series uses ultrasound to determine the 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 2 measurements for each of the 3 ultrasonic paths at 60° angles to each other, WMT700 computes the wind speed and direction.

The wind measurement is calculated in a way that completely eliminates the effects of altitude, temperature, and humidity.

Standard and heated models

WMT700 series operates with a power supply of 9 … 36 V DC. For the heated model, an additional heating power supply of 24 … 36 V DC is required. Thermostatically controlled heaters in the transducer heads and arms of the heated model prevent build-up of freezing rain and snow. A model with a heated transducer, arms, and body is available for operation in the harshest and coldest environments. In addition, accessories are available for mounting and connecting WMT700. To minimize interference from birds, a bird prevention kit is available.

Wind speed measurement performance


Observation range WMT701: 0 … 40 m/s (89 mph) 

WMT702: 0 … 65 m/s (145 mph) 

WMT703: 0 … 75 m/s (168 mph) 

WMT704: 0 … 90 m/s (201 mph)

Starting threshold 0.01 m/s (0.0223 mph)
Resolution 0.01 m/s (0.0223 mph)
Response time 250 ms
Accuracy  0 … 75 m/s (168 mph): ±0.1 m/s 

(0.2 mph) or 2 % of reading, whichever is greater 

75 … 90 m/s (201 mph): ±5 % of reading


Wind direction measurement performance


Observation range 0 … 360° 
Starting threshold 0.1 m/s (0.2 mph)
Resolution 0.01° 
Response time 250 ms
Accuracy ±2° 


Powering specifications


Operating voltage 9 … 36 V DC (absolute max. 40 V DC) 1)
Heating voltage 24 … 36 V DC (absolute max. 40 V DC) 1) 
Heating power supply requirement 2)
Heated transducers Average 32 W 

Peak 40 W

Heated transducers and arms Average 152 W 

Peak 200 W

Heated transducers, arms, and body Average 252 W 

Peak 350 W at 24 V DC


1) In maritime environments, the normal input voltage ranges are: operating voltage 10 … 30 V DC (−10 … +30 %) and heating voltage 24 … 30 V DC (−10 … +30 %), as defined in the maritime standard IEC 60945. 

2) The actual power consumption depends on the temperature


Messaging specifications


Readout update interval 4 Hz (default) and 8 Hz (optional)
Units available  m/s, knots, mph, km/h, V, mA, Hz
Operating mode Automatic message or poll mode
Virtual temperature Celsius degrees


Mechanical specifications


Dimensions (H × W × Ø 1)) 348 × 250 × 285 mm 

(13.70 × 9.84 × 11.22 in)

Weight 1.8 kg (4.0 lb) 
Body and arms, mounting kit Stainless steel AISI 316
Transducers Silicone
Connector housing surface Nickel-plated brass


1) Diameter of area covered by transducers.


Analog outputs


Wind speed Voltage, current, frequency
Wind direction Voltage, current, potentiometer


Operating environment 


Heating 1) 0 W, 30 W, 150 W, or 250 W
Operating temperature 1) −10 … +60 °C (+14 … +140 °F) 

−40 … +60 °C (−40 … +140 °F)

−55 …+70 °C (−67 …+158 °F)

Storage temperature −60 … +80 °C (−76 … +176 °F)
IP rating IP66 and IP67 


1) For freezing conditions, select appropriate combination of heating and temperature ranges


Digital outputs


Communication interfaces COM1: RS‑485 

COM2: RS‑485, RS‑422, RS‑232, SDI‑12 

Communication profiles WMT700, WS425 ASCII, NMEA Standard and Extended (version 0183), SDI-12 (version 1.3), WS425 ASOS, ROSA MES 12, customized
Bit rate 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200 
Available averages Max. 3600s




EU directives and regulations EMC Directive (2014/30/EU) RoHS Directive (2011/65/EU) amended by 2015/863 

REACH Regulation (EC 1907/2006)

EMC immunity IEC 61326‑1, IEC 60945 
EMC emissions CISPR 32 / EN 55032, Class B
Environmental  IEC 60068‑2‑1, 2, 6/34, 30, 31, 67, 78, 

IEC 60529 

VDA 621‑415

Maritime  IEC 60945, DNVGL-CG-0339
Electrical safety UL 61010-1 

CAN/CSA C22.2 No. 61010-1-12

Compliance marks CE, China RoHS, RCM, UKCA
Listing marks SGS (USA and Canada)



WMT700 for Meteorologic Operations


WMT700 for Maritime Operations


WMT700 for Wind Energy


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