Wind Sensors / FT7 Series / Direct Mount – DM
FT742-DM ultrasonic wind sensor

Digital

Analogue

The Direct Mount wind sensor fits directly onto a 33.7mm OD pipe and reads wind speeds up to 75m/s. This makes it ideal for a wide range of meteorological applications and for wind resource assessment.

WIND SPEED
0-75 m/s

HEIGHT
161 mm

OPERATING RANGE
40 to +85 °C

WEIGHT
380 g

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  • Measures wind speed, direction and temperature
  • No moving parts, maintenance free
  • Compact size and shape make it physically strong
  • Powered by Acu-Res® Technology – gives a signal 40dB stronger than other ultrasonics
  • Acu-Res® software automatically compensates for changes in air temperature, pressure and humidity
  • Hard anodised aluminium body is corrosion resistant to ISO9227 & IEC12944, corrosion class C5M
  • Thermostatically controlled heating system – ideal for use in extreme environments
  • Fully-sealed and waterproof to IP66 and IP67
  • Shock-resistant, immune to vibration, electromagnetic interference and solar radiation
  • Operates at temperatures between -40°C and +85°C
  • Resists icing conditions to MIL-STD-810G
  • Operates at altitudes up to 4000m
  • No exposed parts – resistant to bird attack
  • Low power usage – even when heated
  • Wind tunnel checked before despatch, no-recalibration required
  • Wind speed can be output in m/s, km/h or knots
  • Mobile, easy to integrate – mounts directly to pipes with an outer diameter of 33.2mm – 34mm
  • Available with digital RS485HD or analogue 4-20mA interface
  • DIMENSIONS
  • Sensor height
  • Sensor width max
  • I/0 connector width max
  • Mounting pipe external width
  • Mounting flange width
  • WIND SPEED
  • Range
  • Resolution
  • Accuracy
  • WIND DIRECTION
  • Range
  • Resolution
  • Accuracy (within ±10° datum)
  • ACOUSTIC TEMPERATURE
    Available on digital sensors only
  • Resolution
  • Accuracy
  • Under the following conditions:
  • Speed range
  • Operating range
  • Temperature difference
    between the air temperature and the actual temperature of the sensor
  • SENSOR PERFORMANCE
  • Measurement principle
  • Units of measure
  • Altitude
  • Temperature range
  • Humidity
  • Ingress protection
  • Heater settings
  • POWER REQUIREMENTS
  • Supply voltage
  • Supply current (heater off)
  • Supply current (heater on)
  • PHYSICAL
  • I/O connector
  • Sensor weight
  • DIGITAL SENSOR
  • Interface
  • Format
  • Data update rate
  • Error handling
  • ANALOGUE SENSOR
  • Interface
  • Format
  • 4-20mA configuration port
  • Error handling
  • EMC AND ENVIRONMENTAL TESTS
 
  • DIMENSIONS

  • Sensor height

    161mm

  • Sensor width max

    56mm

  • I/0 connector width max

    22.1mm

  • Mounting pipe external width

    33.7mm

  • Mounting flange width

    45mm

  • WIND SPEED

  • Range

    0-75m/s

  • Resolution

    0.1m/s

  • Accuracy

    ±0.3m/s (0-16m/s)
    ±2% (16-40m/s)
    ±4% (40-75m/s)

  • WIND DIRECTION

  • Range

    0 to 360°

  • Resolution

  • Accuracy (within ±10° datum)

    4° RMS4

  • ACOUSTIC TEMPERATURE
    Available on digital sensors only

  • Resolution

    0.1°C

  • Accuracy

    ±2°C

  • Under the following conditions:

  • Speed range

    5m/s - 60m/s

  • Operating range

    -20°C to +60°C

  • Temperature difference
    between the air temperature and the actual temperature of the sensor

    <10°C

  • SENSOR PERFORMANCE

  • Measurement principle

    Acoustic Resonance (automatically compensates for variations in temperature, pressure & humidity)

  • Units of measure

    Metres per second, kilometres per hour or knots

  • Altitude

    0-4000m operating range

  • Temperature range

    -40° to +85°C (operating and storage)

  • Humidity

    0-100%

  • Ingress protection

    IP66 and IP67

  • Heater settings

    0° to 55°C. The heater set point can be configured

  • POWER REQUIREMENTS

  • Supply voltage

    12V to 30V DC (24V DC nominal). Supports 12V battery operation with reduced heater capacity

  • Supply current (heater off)

    31mA typical

  • Supply current (heater on)

    Limited to 4A (default), 6A (max) – configurable in software in 0.1A increments. Heater power consumption will depend on the energy required to keep the sensor’s temperature at the user determined set point. The heater and sensor power consumption is limited by default to 99W.

  • PHYSICAL

  • I/O connector

    5-way (RS485HD option), 8-way (4-20mA option) multipole connector

  • Sensor weight

    380g

  • DIGITAL SENSOR

  • Interface

    RS485 (half-duplex), galvanically isolated from power supply lines and case

  • Format

    ASCII data, polled or continuous output modes, Polar and NMEA 0183

  • Data update rate

    Up to 10Hz

  • Error handling

    When the sensor detects an invalid reading an error flag is included in the wind velocity output message (see user manual for further details).

  • ANALOGUE SENSOR

  • Interface

    4-20mA, galvanically isolated from power supply lines and case

  • Format

    One 4-20mA current loop for wind speed (different scaling factors are available). One 4-20mA current loop for wind direction (datum value configurable as 4mA or 12mA). Both analogue channels aer updated ten times per second.

  • 4-20mA configuration port

    This port is for the user to change the internal settings of analogue sensors and to perform diagnostic testing. This interface is not intended for permanent connection to a data logger or other device.

  • Error handling

    When the sensor detects an invalid reading then both speed and direction current loops will drop to a default value of 1.4mA (configurable up to 3.9mA).

  • EMC AND ENVIRONMENTAL TESTS

    The FT7 Series have passed over 28 different environmental test certificates including Corrosion, Icing, De-Icing, Shock, Hail, Drop, ESD, power interruption and EMC. Further test details and full test reports available on request or via our website.

FT742-A-DM High Speed Wind Sensor Analogue Direct Mount
FT742-A-DM KIT-5 High Speed Wind Sensor Analogue Direct Mount with 5m cable

FT742-D-DM High Speed Wind Sensor Digital Direct Mount
FT742-D-DM KIT-5 High Speed Wind Sensor Digital Direct Mount with 5m cable
FT742- DM
Environmental Tests
Cold EN 60068-2-1
Dry Heat EN 60068-2-2
Temperature Cycling EN 60068-2-14
Cyclic Humidity EN 60068-2-30
Stationary Humidity EN 60068-2-78
Combined Temperature & Humidity EN 60068-2-38
Sinusoidal Vibration EN 60068-2-6
Random Vibration EN 60068-2-64
Mechanical Shock EN 60068-2-27
IP 6X Dust EN 60529
IP X7 Immersion EN 60529
Wind Blown Dust Test DEF STAN 00-35 Issue 4
Wind Blown Sand Test DEF STAN 00-35 Issue 4
Corrosion ISO 9227 & IEC12944
Solar Radiation EN 60068-2-5
Altitude EN 60068-2-13
Drop EN 60068-2-31
Hail EN 61215
Fog DEF STAN 00-35
Rain DEF STAN 00-35
Icing MIL-STD-810G
HALT HALT

EMC
Emission standard for residential, commercial and light-industrial environments EN 61000-6-3
Immunity for Industrial Environments EN 61000-6-2
Electrostatic discharge immunity test EN 61000-4-2
Radiated, radio-frequency, electromagnetic field immunity test EN 61000-4-3
Electrical fast transient/burst immunity test EN 61000-4-4
Surge immunity test EN 61000-4-5
Immunity to conducted disturbances, induced by RF fields EN 61000-4-6
Power frequency magnetic field immunity test EN 61000-4-8
Pulse magnetic field immunity test EN 61000-4-9
Damped oscillatory magnetic field immunity test EN 61000-4-10
Voltage dips, short interruptions and voltage variations on d.c. input power port immunity tests EN 61000-4-29

 

If you want to know more about FT wind sensors certification, visit the Product Certification page.