Vaisala WMT700 Technical data

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WMT700 WINDCAP® Ultrasonic Wind Sensors

Vaisala WINDCAP 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.

The WMT700 Series meets the updated - WMO-No.8 guide, 7th edition - and ICAO requirements.

Accurate and Maintenance-free

The WMT700 series has a durable full steel structure with welded arms, clear north indication, and onepoint, quick bayonet-style mounting. It has 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. Self-diagnostics and validation of measurement are standard features. The 60-min. average is available for polar coordinates and vectors.

Measurement Based on Ultrasound

The WMT700 series 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 at 60° angles to each other,

Ultrasonic Wind

the 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

The sensor operates with a power supply of 9 ... 36 VDC. For the heated model, an additional heating power supply of 24 ... 36 VDC is required. Thermostatically controlled heaters in the transducer heads and arms of the heated model prevent build-up of freezing rain or snow.

In addition, accessories are available for mounting and connecting the WMT700. To minimize interference from birds, a bird prevention kit is available.

Features/Beneﬁts

WMO and ICAO compliant

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Data output rate 0.25 s

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Self-diagnostics and validation

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Bird prevention kit

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Stainless steel structure

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Maintenance-free

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Patented three-transducer

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layout provides accurate data

Data format outputs: polar

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coordinates and vectors

Fully compensates eects of

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temperature, humidity and pressure

The WMT700 Series has been designed for professional use.

Measurement range up to 75 m/s

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Heating up to 150 W

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Max. 3600-second averag

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IP66 and IP67

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Robust EMC design

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Can be mounted upside down

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Large transducers provide high

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ultrasound power

Wind gust calculated according

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to the WMO guidelines

US National Weather Service

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relies on Vaisala WINDCAP technology

Technical data

Wind speed

Measurement range

701 0 ... 40 m/s 702 0 ... 65 m/s 703 0 ... 75 m/s

Accuracy +/- 0.4 m/s or 3 % of reading,

whichever is greater Starting threshold 0.01 m/s Resolution 0.01 m/s Response time 250 ms

Wind direction

Measurement range 0 ... 360° Accuracy +/-2° Starting threshold 0.1 m/s Resolution 1° Response time 250 ms

Outputs

Communication media

communication 1 RS485, RS422, RS232, SDI-12 communication 2 RS485 analog 1 wind speed voltage, current, frequency analog 2 wind direction voltage, current,

potentiometer

Message format WMT70, ASCII, NMEA, SDI12, ASOS,

MES 12, customized

Baud rate 300, 1200, 2400, 4800, 9600, 19200, 38400,

57600, 115200 Available averages max. 3600 s Readout up-date interval max. 4 Hz, Units

digital outputs m/s, knots, mph, km/h

analog outputs V, mA, Hz Operating mode automatic or poll mode Virtual temperature degrees Celcius

General

Heating Temperature -

operating

-10 ... +60 or -40 ... +60 or -55 ... +70 °C

storage -60 ... +80 °C

0 or 30 or 150 W

Operating voltage 9 ... 36 VDC, max. 40 VDC Heating voltage 24 ... 36 VDC, max. 40VDC Heating power supply requirement for

transducers 40 W

transducers and arms 200 W IP class IP66 and IP67 Material

body, arms stainless steel

transducer heads silicone

connector housing surface nickel plated brass Dimensions

height 350 mm

width 250 mm

depth 285 mm Weight 2 kg Approvals CE, CE-TICK

Test standards

Wind ISO 16622 EMC IEC61000-4-2 ... 6; CISPR 22 Environmental IEC60068-2-1,2,6/34,30,31,67,78;

IEC60529; VDA 621-415

Maritime Lloyd’s requirements, IEC 60945

Accessories

Cable 2 m, cable connector, open leads on one end 227567SP Cable 10 m, cable connector, open leads on one end 227568SP RS485 Cable 2 m, cable connector, open leads on one end 228259SP RS485 Cable 10 m, cable connector, open leads on one end 228260SP MAWS cable 10 m 227565SP AWS520 cable 10 m 227566SP Adapter cable for WS425 serial output 227569SP Adapter cable for WS425 analog output 227570SP Fix70 mounting kit for WMT700 WMT70FixSP Veriﬁer WMT70Veriﬁer Bird cage WMT70BirdKit

For freezing conditions select appropriate combination of heating and temperature ranges.

For more information, visit www.vaisala.com or contact us at sales@vaisala.com

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