F T 742- D M5 0 ( DI R E C T MO UN T)
ACOU ST I C R E S ON A N C E W IN D SE NSOR

The FT742-DM50 wind sensor fits directly onto a 47.9 to
50.2mm OD pipe and reads wind speeds up to 75m/s. For easeof alignment, it can be fitted using our special FT039 alignment
collar and FT040/041 alignment tools.
With superior corrosion resistance and lightning protection,
the DM50 has been specifically designed for wind turbine
control. 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 and IPX6K standard.
Small yet very rugged, it is designed to last for up to 20 years,
even in an offshore environment. With no moving parts todegrade or damage and resistant to shock and vibration, it iseasy to transport and can be used to upgrade and retrofit olderturbines.

ADI M E NS IONS
A. Sensor height		

174mm

B. Sensor width max

70mm

C. Mounting pipe outside diameter

50.2mm

D. I/O connector width

22.1mmDCBSP 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

535

AVAILABILIT Yg

T H E WO R L D ’ S TO U G H E ST W I N D S E N S O R S

W 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 5 0 ( DI R E C T MO UN 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 (within ±10° datum)		 2° RMS
Accuracy (outside ±10° datum)		 4° RMS

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 Conector 			Sensor weight 			

DIGITAL SENSOR

Interface 			Format 			Data update rate 		Error handling 			ANALOGUE SENSOR

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

Acoustic Resonance (automatically compensates for variations in temperature,pressure & humidity)
Metres per second, kilometres per hour or knots
0-4000m operating range-40° to +85°C (operating and storage)
0-100%
IP66, IP67 and IPX6K
0° to 55°C. The heater set point can be configured

12V to 30V DC (24V DC recommended). Supports 12V battery operation with reduced heater capacity
31mA typical
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.
5-way (RS485 option) or 8-way (4-20mA option) multipole connector.
535g
RS485 (half-duplex), galvanically isolated from power supply lines and case
ASCII data, polled or continuous output modes, NMEA 0183
Maximum 10 measurements per second
When the sensor detects an invalid reading a character is set in the wind velocity output message. Thiserror flag character is 1.

Interface 			Format 			

4-20mA, galvanically isolated from power supply lines and caseOne 4-20mA current loop for wind speed (different scaling factors are available). One 4-20mA current loop for winddirection (datum value configurable as 4mA or 12mA). Both analogue channels are updated ten times per second.
Configuration port			 This non-isolated RS485 port is for the user to change the internal settings of analogue sensors and toperform diagnostic testing. This interface is not intended for permanent connection to a data logger orother 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).

ALIGNMENT ACCESSORIESFT has developed two accessories to facilitate fast and precise alignment of the FT742-DM50 to a given datum. Both of these accessories are designed to
be used with a Laserboy II or comparable clamp-on laser unit.

FT040 - Mast Mounted Alignment Tool
The FT040 is used in conjunction with the FT039Alignment Collar. Use FT040 to align the collar before
locking it in place. The alignment accessory can thenbe removed to fit an FT742-DM50 in the pre-alignedposition.

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.

FT041 - Sensor Mounted Alignment Tool
The FT041 clamps onto the FT742-DM50, allowing
you to rotate the sensor to datum before locking it inplace. The alignment accessory can then be quickly
removed for use on the next sensor.

A4178-5-EN
Information furnished by FT Technologies Ltd is believed
to be accurate and reliable. However, no responsibility is
assumed 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.