FT742

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.

FT742 - SPECIFICATIONS AT A GLANCE

Wind speed
0-75m/s
Accuracy: ±0.3m/s (0-16m/s)
±2% (16-40m/s)
±4% (40-75m/s)
Wind direction
0-360°
Accuracy: 2° RMS (within ±10±º datum)
4° RMS (>±10±º of datum)
Temperature range
-40to +85°C
Three heater elements ensure even distribution of heat over entire body. Resists icing conditions to MIL-STD810G.
Power required
31mA
Min consumption - heaters off. Supply current is limited to 4A by default.

 

 

 

DATA AVAILABILITY
99.9%
Unique Acu-Res® technology gives 10 measurements per second.
INGRESS
IP66/67
Fully sealed and corrosion resistant to ISO 9227 & IEC12944. Corrosion class C5M.
HEIGHT
161mm
Small, compact and easily transported. I/O connector either 5-way (RS485 option) or 8-way (4-20mA option) multipole connector.
WEIGHT
350g
Hard anodised alloy body for a lightweight yet rugged sensor that can withstand severe vibrations and extreme impacts.

FT742 - FOUR MOUNTING OPTIONS GIVE INSTALLATION FLEXIBILITY

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.

FT742-FF-Flat-Front-Ultrasonic-Wind-Sensor 
FLAT FRONT (FF)

Ideal for wind turbine control

FT742-PM-Pipe-Mount-Ultrasonic-Wind-Sensor 
PIPE MOUNT (PM)

Ideal for wind turbine control

FT742-DM-Direct-Mount-Ultrasonic-Wind-Sensor 
DIRECT MOUNT (DM)

For use in meteorological applications

FT742SM-Surface-Mount-Ultrasonic-Wind-Sensor 
SURFACE MOUNT (SM)

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

These specifications are calculated with the default filter enabled.

INTERFACE and data format

Power requirements

Supply voltage: 20V 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

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

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).

HEATING SYSTEM

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.

PRODUCT CERTIFICATION

The FT742 ultrasonic sensor has passed over 28 certification tests, making it ideal for use in extreme climates. Theses tests include:

  • Corrosion ISO 9227 (2006)
  • Neutral Salt Spray IEC 12944 C5-M
  • High Sinusoidal and Random Vibration EN 60068-2-6 and EN 60068-2-64
  • Drop EN 60068-2-31
  • Sand & Dust, Fog & Rain DEF STAN 00-35 CL25, CL26, CL27
  • Ingress Protection IP66 and IP67   

For full details see Product Certification.

In addition the FT742 wind sensor is a Recognized Component by Intertek to the UL safety standard 61010-1 and CAN/CSAC22.2 No. 61010-1-04. 

The FT742 has also passed the FT Highly Accelerated Life Test (HALT) in which the sensor is temperature cycled from +125°C to -90°C whilst being vibrated at 30grms. ​​

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