FT Technologies

Model FT742 - Wind Sensor

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The FT742 is our newest model and measures wind speeds up to 75 m/s. Its innovative design incorporates a series of “turbulators” which condition the air flow to deliver our highest levels of accuracy yet. Available in four mounting options, the Flat Front (FF) and Pipe Mount (PM) are typically used in wind turbine control and the Direct Mount (DM) in meteorological applications. The Surface Mount (SM) has been specifically designed for OEM integration and for use on UAVs/drones.

The FT742 has four physical mounting options. The Flat Front (FF) and Pipe Mount (PM) are generally used in wind turbine control. The Direct Mount (DM) fits directly onto a 33.7mm pipe, making it ideal for a wide range of meteorological applications. The Surface Mount (SM) has been specifically designed for OEM integration.

WIND SPEED & DIRECTION

  • Wind speed
  • Range: 0-75m/s
  • Resolution: 0.1m/s
  • Accuracy: ±0.3m/s (0-16m/s), ±2% (16m/s-40m/s),  ±4% (40m/s-75m/s)

Wind direction

  • Range: 0-360°
  • Resolution: 1°
  • Accuracy (within ±10° of datum): 2° RMS (beyond ±10° of datum): 4° RMS

INTERFACE and data format

Power requirements

Supply voltage: 12V to 30V DC (24V DC nominal)

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 (RS485 option), 8-way (4-20mA option) multipole connector

Sensor weight: 320g (max) for Flat Front variant 350g (max) for Pipe Mount variant

Digital Sensor

FT742-D-FF, FT742-D-PM, FT742-D-DM, FT742-D-SM

Interface: RS485, galvanically isolated from power supply lines and case

Format: ASCII data, polled or continuous output modes, NMEA 0183

Data update rate: 10 measurements per second.

Error handling: When the sensor detects an invalid reading a character is set in the wind velocity output message. This error flag character is a value other than 0.

Analogue Sensor

FT742-A-FF, FT742-A-PM, FT742-A-DM

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 are updated 10 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). If the sensor detects a wind speed of greater than 75m/s then the speed current loop will be set to 20.48mA and the direction current loop will be set to the error value – by default 1.4mA (configurable up to 3.9mA).

These specifications are calculated with the default filter enabled.

The sensor is fitted with a thermostatically controlled ‘all-body’ heating system. The sensor maintains its temperature at a user specified heater set point of between 0⁰C and 55⁰C. Three software controlled heaters are used to distribute heat intelligently over the entire sensor.

In standard format the heaters draw a maximum of 99W. For extreme environments the current limit can be adjusted (power supply and cabling permitting) from 0.1 to 6 Amps.

The sensor’s small size means that the power is used very effectively ensuring that the sensor can stay ice-free.

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