F T 742- S M ( S UR FAC E M O U N T )ACOU ST I C R E S ON A N C E W IN D SE NSOR

D ES I G NED FO R I N T E G R AT I O N

BThe FT742 Surface Mount wind sensor is designed for OEM
integration. It has an electronic compass and a thermostaticheater. The sensor has been integrated into UAVs, military
vehicles, autonomous robots, handheld weather stations,
CBRN detection units, drifter buoys, vehicle-mounted and shipbased meteorological systems.
The hard anodised aluminium body is highly resistant toelectromagnetic interference, corrosion, sand, dust, solar
radiation and bird attack. With no moving parts to degrade
or damage, it is also able to withstand significant shock andvibration. It is sealed to IP66 and IP67 standard.

AC

The sensor can be installed to ensure alignment with a standard
reference, typically Magnetic North, or the integrated compass
can calculate this automatically.

DI M E NS IONS
A. Sensor height		

71.2mm

B. Sensor width max.

56mm

C. Mounting surface to cavity centre

32.9mm

D. Recommended mounting surface hole

24mmDSP EC I F I C AT I O NS AT A GL ANC E
WI N D S PE E D

0-75

WEIGHTm/s

252

AVAILABILIT YgTHE WORLD’S TOUGHEST WIND SENSORSW W W. F T T E C H N O L O G I E S . C O M

>

99.9%

F T 742- S M ( S UR FAC E M O U N T )WIND SPEED 4Range					0-75m/s		
0-270km/h
Resolution			
0.1m/s		
0.1km/h		Accuracy				±0.3m/s (0-16m/s)
					±2% (16-40m/s)
					±4% (40-75m/s)

0-145.8 knots
0.1knots

WIND DIRECTIONRange 					0 to 360°
Resolution 				1°Accuracy				4° RMS
Compass accuracy			 5° RMS

ACOUSTIC TEMPERATURE

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 <10°C
between the air temperature and theactual temperature of the sensor.

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, IP67 - when correctly installed with supplied O-ring
Heater settings 				0° to 55°C (factory and user configurable)

POWER REQUIREMENTS

Supply voltage 				6V to 30V DC (24V DC nominal). Supports battery operation with reduced heater capacity.3
Supply current (heater off ) 		25mA typical (29mA with compass enabled)
Supply current (heater on) 			
Up to 2A1,2
Power consumption with heater disabled (for battery use):					Battery Supply Voltage		 Compass Disabled			Compass Enabled					24V				600mW				696mW					12V				300mW				348mW					9V				225mW				261mW					6V				150mW				174mW

PHYSICAL

I/O connector 				Universal M12 8-pole circular connector
Sensor weight 				252g

DIGITAL SENSOR

Interface 				RS422 (full-duplex). RS485 (half-duplex)
Format 				ASCII data, polled or continuous output modes, Polar and NMEA 0183
Data update rate 				10HzError 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).
Overspeed Warning 			
The sensor has an optional overspeed warning scheme. This scheme is disabled by default but can be					enabled at the factory if requested. With the scheme enabled, if the sensor detects a wind speed greater					than 75m/s a character is set in the wind velocity output message (see user manual for further details).
This is the default heater current limit, if higher currents are required, please contact FT Technologies.
Heater control is achieved through a closed loop system, therefore the power consumption of the heater is a function of the applied cooling load on
the sensor and the user temperature set point. Maximum heating power is 60 W at 30 V.
3EN 61000-4-29 only applicable when the sensor power supply is between 20V to 30V DC.
4km/h & knots only available when operating the sensor in NMEA 0183 mode.
12FT Technologies Ltd
Sunbury House, Brooklands Close
Sunbury on Thames, TW16 7DX, UK
Tel: +44 (0)20 8943 0801 | info@fttechnologies.com
The FT and Acu-Res logos and the Acu-Res® nameare registered trade marks of FT Technologies Ltd.

A4158-4-EN
Information furnished by FT Technologies Ltd is believed
to be accurate and reliable. However, no responsibility isassumed by FT Technologies Ltd for its use; nor for any
infringements of patents or other rights of third parties which
may result from its use. No licence is granted by implicationor otherwise under any rights of FT Technologies Ltd.