F T 742- DM (D I R E C T 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 M E T E O R O LO GY

B

The FT742 Direct Mount fits directly onto a 33.7mm pipe andreads wind speeds up to 75m/s. This makes it ideal for a wide
range of meteorological applications and for wind resource
assessment.
Small yet very rugged, it is easy to heat even at low power.
With no moving parts to degrade or damage and resistant toshock and vibration, it is easy to transport and will performconsistently, time and time again. The hard anodised aluminium
body is highly resistant to corrosion, sand, dust, ice, solar
radiation and bird attack. The sensor is sealed to IP66, IP67 andIPX6K standard.
Typical uses of this sensor include: weather stations, defence,hurricane research, cold climate monitoring, portable met
masts, airports, harbours, railways, alpine resorts, dynamic
positioning systems, buoys and mining.

ADI M E NS IONS
A. Sensor height		

161mm

B. Sensor width max.

56mm

C. I/0 connector width max

22.1mm

D. Mounting pipe external width

33.7mm

E. Mounting flange width

45mmCDESP 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

380

AVAILABILIT Yg

THE 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- DM (D I R E C T M O U N T )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 				1°Accuracy				4° 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.
*Available on digital sensors only

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 and IPX6K
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 typicalSupply 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 				380g

DIGITAL SENSOR

Interface 				RS485 (half-duplex), galvanically isolated from power supply lines and caseFormat 				ASCII data, polled or continuous output modes, Polar and NMEA 0183
Data update rate 				Maximum 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 1

ANALOGUE SENSORInterface 				4-20mA, galvanically isolated from power supply lines and caseFormat 				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 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 TESTSThe FT7 Series have passed over 30 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.

FT 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.

A4157-6-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.