FTS - Surface Mount (SM)

It Looks Different Because It Is Different
The FT742-DM (Direct Mount) ultrasonic anemometer is the latest addition to FT Technologies` FT7 Series - the world`s toughest wind sensors. Measuring wind speeds up to 75 m/s, the FT742-DM has been specifically designed for use in meteorological applications and to meet the WMO standards for wind sensors.

Powered by Acu-Res Technology the FT742-DM is unique in the market. Extremely small, with no moving parts to degrade, the FT742-DM is a very rugged wind sensor that is maintenance-free and delivers 99.9% data availability, for years on end even in the harshest of conditions.

New Design Delivers Improved Accuracy

The FT742-DM mounts directly onto a 33.7mm pipe.

Along with improved software, and calibration in FT Technologies` new state-of-the-art wind tunnel, the FT742-DM delivers FT Technologies` highest levels of accuracy in wind speed and direction measurement.

Maintenance-Free

The aluminum hard anodised body is highly resistant to corrosion, sand, dust, ice, solar radiation and bird attack. The sensor is sealed to IP67 standard and inherently compensates for changes in air temperature, pressure and humidity.

Mobile, Compact, Lightweight
The FT742-DM is small, only 162mm high, and weighs only 380g. This makes it suitable for portable equipment. The sensor can be supplied with either RS485 or analog 4-20mA output, and can be specified to output data in m/s, km/h or knots.

Rugged and Shock-Resistant
With no moving parts to degrade or damage, and resistant to shock and vibration, the FT742-DM is suitable for all mobile applications.

Powerful De-Icing
The FT742-DM is fitted with a thermostatically controlled heating system. The sensor maintains its temperature at a user specified heater set point of between 0° and 55°C.

Low Power Usage
In standard format the heaters draw a maximum of 99W. With the heaters switched off the FT742-DM draws only 30mA at 24 volts DC. However it can also run at 12 volts making it ideal for use with batteries.

Used Everywhere
FT anemometers have been used in meteorological applications all over the world including at both poles. Customers have used FT sensors in weather stations, hurricane research, cold climate weather oceanographic research and maritime navigation.

This is Acoustic Resonance technology. Acu-Res enables FT Technologies’ sensors to take accurate measurements in a small space. This means FT Technologies’ sensors are small, easy to heat, durable and strong. Acu-Res sets FT sensors apart from mechanical and other ultrasonic wind sensing technologies to give a more robust and reliable measurement solution.

The sensor works by creating a resonating ultrasonic signal inside the sensor’s measurement cavity. The motion of air is sensed by measuring the phase change in the ultrasonic signal caused by the wind as it passes through the cavity. The sensor has three transducers arranged in an equilateral triangle. The net phase difference between a transmitting and receiving transducer pair is indicative of the airflow along the axis of the pair. Therefore by measuring all three pairs the component vectors of the airflow along the sides of the triangle are determined.

These vectors are combined to give the overall speed and direction. The sensor uses complex signal processing and data analysis taking a sequence of multiple measurements to calculate regular wind readings.