Introduction and benefits
The FT702LT Series wind sensor powered by Acu-Res® technology is specifically designed for turbine control. Its compact size and robust construction mean that it will give many years of reliable service despite the harsh conditions found on many wind farms.
In design, development and manufacture everything possible is done to ensure that the product meets the demanding requirements of the wind turbine industry. The FT702LT Series provides wind turbine manufacturers and operators with a ‘fit and forget’ wind sensing solution.
Every sensor is thoroughly tested before despatch and is calibrated in our own wind tunnel and no further calibration is required. To date, FT Technologies wind sensors have provided over 1,500,000,000 hours of measurements on turbines around the world.
Optimised for turbine control – onshore and offshore
The sensor has no moving parts and does not need re-calibration. This reduces costly turbine down-time and maintenance visits. The sensor is well suited to offshore applications with the incorporation of enhanced protection to prevent corrosion from high levels of salt spray. The sensor has achieved a Class C5-M rating.
For operation in ice-prone areas both onshore and offshore, the FT702LT Series is fitted with a highly effective thermostatically controlled ‘all-body’ heating system. A three element heater (one element located in the top of the sensor and two in the bottom) is used. This can generate far more than 0.4 Watt/cm2 which the Finnish Meteorology Institute has determined is required to keep a sensor ice free.
Independent tests to recognised standards show that the sensor can withstand random and sinusoidal vibration, physical impact, lightning and EMC. The FT702LT Version 22 has also passed a hail test with 25mm hailstones hitting it at 23m/s.
The sensor can be mounted either with a mounting flat to a bar or with the specially designed adapter to a pipe. Both systems allow for quick and repeatable alignment of the sensor.
The FT702LT product range
The FT702LT sensors can be supplied with an analogue or digital interface. The Version 20 sensor has been available for the last four years and has been installed on wind turbines worldwide. The Version 22 is the newest variant of the sensor and incorporates many improvements. From its inception Version 22 was engineered to comply with the Procurement specifications of the major wind turbine manufacturers.