Anémomètre FT742-A-DM — boîtier FT742 à montage direct ; sortie analogique non identifiable visuellement

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FT Technologies

FT742-A-DM

FT Technologies FT742-A-DM - Analog Ultrasonic Anemometer

Designed for demanding environments, the FT Technologies FT742-A-DM ultrasonic anemometer provides precise wind speed and direction measurements via two 4-20 mA analog current loops. Its design without moving parts and hard-anodized aluminum housing ensure resistance to shock, vibration, and extreme conditions (IP67). Sold individually, without accessories.

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2.785,89€

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Available in stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

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Technical specifications

Wired network	4-20 mA, RS485 (configuration port)
Wind angle accuracy	4 RMS
Anemometer type	Acoustic resonance ultrasonic
Housing material	Hard anodized aluminum alloy
Product height	161
Operating voltage	12-30 V DC (24 V DC nominal)
Max power consumption	99
Product width	56
Operating temperature	-40 to +85
Ingress protection	IP66, IP67, IPX6K
Mounting type	Direct tube mounting
Water ingress protection	IP66 / IP67 / IPX6K
Manufacturer Reference	FT742-A-DM
Output Interface	4-20 mA
Wind Speed Range	0-75

Detailed description

The FT Technologies FT742-A-DM ultrasonic anemometer is designed for measuring wind speed and direction in a wide range of meteorological applications, including harsh environments such as icing, sand, dust, and offshore installations. This sensor uses acoustic resonance airflow detection technology for reliable measurement without moving parts, ensuring high data availability (greater than 99,9 %). Its hard-anodized aluminum alloy body offers resistance to corrosion, shocks, vibrations, solar radiation, and bird attacks.

Design and Technology

The FT742-A-DM incorporates a thermostat-controlled three-element heating system, ensuring uniform heat distribution across its entire surface for efficient operation in icing-prone areas. The acoustic resonance measurement principle automatically compensates for variations in temperature, pressure, and humidity, ensuring accurate readings. The direct mounting design fits a tube with 33,7 mm outer diameter (EN10255 standard), secured by four M6 screws.

Measurement Performance

This sensor provides precise wind speed and direction data. For speed, the range is 0 to 75 m/s with a resolution of 0,1 m/s and an accuracy of ±0,3 m/s (from 0 to 16 m/s), ±2 % (from 16 to 40 m/s) and ±4 % (from 40 to 75 m/s). Direction is measured over a range of 0 to 360° with a resolution of 1° and an accuracy of 4° RMS. Outputs are managed by two 4-20 mA analog current loops, one for speed and one for direction, updated 10 times per second and galvanically isolated. A semi-duplex RS485 configuration port is available for internal settings and temporary diagnostics.

Integration and Environment

Required power supply ranges from 12 to 30 V DC (nominal 24 V DC), with a typical consumption of 31 mA (heater off) and a maximum of 6 A (heater on, limited to 4 A by default). The sensor is certified IP66, IP67, and IPX6K, ensuring protection against dust and powerful water jets, including high-pressure jets. Its operating and storage temperature range extends from -40°C to +85°C, and it operates in humidity conditions of 0 to 100 % and at altitudes up to 4000 m. The FT742-A-DM has passed over 30 environmental tests, including corrosion, icing, shock, and electromagnetic interference.

Detailed Technical Specifications

Feature	Value
Measurement Principle	Acoustic resonance (automatic temperature, pressure, humidity compensation)
Wind Speed Range	0 to 75 m/s
Wind Speed Resolution	0,1 m/s
Wind Speed Accuracy	±0,3 m/s (0-16 m/s), ±2% (16-40 m/s), ±4% (40-75 m/s)
Wind Direction Range	0 to 360°
Wind Direction Resolution	1°
Wind Direction Accuracy	4° RMS
Temperature Range (operating and storage)	-40°C to +85°C
Humidity	0-100 %
Operating Altitude	0-4000 m
Interface	2x 4-20 mA current loops (speed and direction), galvanically isolated
Data Update Rate	10 Hz
Supply Voltage	12 V to 30 V DC (nominal 24 V DC)
Supply Current (heater off)	Typical 31 mA
Supply Current (heater on)	Max 6 A (limited to 4 A and 99 W by default)
Weight	380 g
Material	Aluminum alloy (hard anodized)
I/O Connector	8-way
Mounting Method	Screw fixation for 33,7 mm outer diameter tube
Protection Rating	IP66, IP67, IPX6K
Sensor Height	161 mm
Maximum Sensor Width	56 mm
Maximum I/O Connector Width	22,1 mm
Outer Width of Mounting Tube	33,7 mm
Mounting Flange Width	45 mm

Documentation

Type	Nom
	- analog user manual (FR)
	FT742-DM - analog/digital datasheet (FR)
	- analog user manual (EN)
	FT742-DM - analog/digital datasheet (EN)

Expert opinion

« Integration and Robustness of the FT742-A-DM Anemometer »

The FT Technologies FT742-A-DM anemometer is a robust solution for wind measurement, particularly suited for meteorological applications in demanding environments. Its design without moving parts, based on acoustic resonance, provides high reliability and reduced maintenance, distinguishing it from mechanical sensors prone to wear and icing.

This model, designed for direct mounting on a 33,7 mm tube, is ideal for weather stations, offshore platforms, buoys, or sites exposed to cold and humidity. Integration requires careful attention to lightning protection: the sensor is electrically isolated from the mounting pole. For effective grounding, especially in areas at risk of lightning strikes, the FT035 accessory is essential for creating a low-resistance path. Precise alignment of the sensor to magnetic north is facilitated by a dedicated mark, ensuring consistency of directional data.

The galvanically isolated 4-20 mA analog output is compatible with data acquisition systems that accept 4-20 mA current loops. It is crucial to respect loop resistance limits (e.g., 100 Ω for 12 V, 1000 Ω for 30 V) for optimal performance over long cable distances. The use of shielded twisted-pair cabling is recommended to minimize interference. The RS485 port is intended for initial configuration or diagnosis only, not for permanent connection. Finally, adequate software management is necessary to interpret error signals (drop to 1,4 mA) and to utilize the sensor's internal averaging filter, thus ensuring data integrity even in the presence of temporarily invalid readings.

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FT Technologies FT742-A-DM - Analog Ultrasonic Anemometer

2.785,89€

Frequently Asked Questions

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What are the main features of the FT742-A-DM ultrasonic anemometer?

The FT742-A-DM is an ultrasonic wind sensor designed for general meteorological applications, including harsh environments such as icing, sand, dust, and offshore installations. It uses acoustic resonance airflow detection technology to measure wind speed and direction. This sensor has no moving parts, which gives it high reliability and resistance to shocks, vibrations, corrosion, sand, dust, ice, solar radiation, and bird attacks.

What data output interfaces are available on the FT742-A-DM sensor?

The FT742-A-DM sensor is an analog variant and has two galvanically isolated 4-20 mA current loop outputs:

A 4-20 mA current loop for wind speed. The default scale is 0 to 75 m/s, but configurable scale factors are available.
A 4-20 mA current loop for wind direction, covering a range of 0 to 360°. The reference value can be configured at 4 mA or 12 mA.
Both analog channels are updated at a frequency of 10 times per second. A semi-duplex RS485 configuration port is also available for changing internal settings and performing diagnostic tests, but it is not intended for permanent connection.

How is the FT742-A-DM wind sensor mechanically installed?

The FT742-A-DM sensor is designed for direct mounting on a hollow tube with an outer diameter of 33,7 mm (standard EN10255 sizes). To securely fix the sensor, four M6 screws are required. A FT033 conical tube insert is recommended to facilitate mounting and protect the sensor's internal O-ring. Sensor alignment to magnetic north (0°) can be performed using a compass and the "N" marking on the sensor.

What environmental conditions can the FT742-A-DM sensor withstand?

The FT742-A-DM sensor is designed for operation in demanding environments. It supports an operating and storage temperature range of -40 °C to +85 °C and humidity from 0 to 100 %. Its protection rating is IP66, IP67, and IPX6K, ensuring protection against dust and powerful water jets, including high-pressure jets. It can also operate at altitudes up to 4 000 meters.

What type of cables are recommended for connecting the FT742-A-DM?

The connectors of the FT742-A-DM sensor are compatible with cables having a maximum outer diameter of 8,0 mm (for W.W.Fischer connectors) or 9,2 mm (for ODU connectors), and individual conductors up to 1,2 mm in diameter. It is recommended to use twisted pair interconnection cabling including an overall braided shield. Cables such as SAB Brockskes SD980CPTP 3x2x0,5 mm² or similar types may be used. FT Technologies also offers specific cables such as FT004 (8 m), FT005 (15 m) and FT008 (5 m) which are compatible with 4-20mA wind sensors.

Is the FT742-A-DM sensor protected against lightning and power surges?

The FT742-A-DM sensor is designed for meteorological use and can survive a properly diverted lightning strike. It is electrically isolated from the mounting pole. For enhanced protection, the FT035 grounding accessory can be installed in the connector chamber to provide a low-resistance grounding path to the metal mounting tube. The use of UL-listed 1449 lightning arrestors and surge protective devices (SPDs) with a minimum rated surge current of 20 kA is recommended, installed as close as possible to the signal entry point into the data acquisition enclosure.

How does the FT742-A-DM sensor's integrated heating system work?

The FT742-A-DM sensor is equipped with a three-element integral heating system, distributed throughout the body, to prevent icing in freezing weather. This heating is automatically controlled by the sensor via a user-programmable temperature set point (by default, the current limit is 4A, configurable up to 6A). The control system dynamically adjusts the current supplied to each heating element to maintain the defined temperature. The heater requires a minimum of 11V to operate and its maximum consumption is limited by default to 99W.