Gill WindObserver70 and WindObserver75 ultrasonic wind sensors are designed to operate in extreme environments, featuring optional high-power anti-icing heating systems, full stainless-steel constructions and a wide range of mounting and connection options.Gill Instruments Ltd, a world leader in ultrasonic anemometers, wind sensors and compact weather stations, has extended the capabilities of the established WindObserver range of ultrasonic wind sensors with the launch of  the WindObserver70 and WindObserver75.The new wind sensors replace the hugely successful Extreme Weather WindObserver and Aviation Standard WindObserver, which are used worldwide for wind monitoring in extreme conditions.WindObserver70 and WindObserver75 are both available with an optional high-power anti-icing heating system which allows operation in temperatures down to -55ºC (-67ºF).WindObserver70 is capable of monitoring wind speeds up to 70m/s (157mph / 136kts) and is recommended for use in aviation, wind turbine and ship DP applications.The sensor has been accepted for service by both the FAA Federal Aviation Administration (USA) and the CAA Civil Aviation Authority (UK) for the observation and reporting of surface wind as part of an Automatic Weather Observing System (AWOS).WindObserver75 is capable of monitoring higher wind speeds up to 75m/s (168mph / 146kts) and is recommended for applications subject to extreme operating conditions, including high altitude mountainous regions and Arctic and Antarctic weather monitoring.WindObserver70 and WindObserver75 both feature full stainless-steel main body constructions and are environmentally protected to IP66. Gill offers a wide range of pipe and thread-mount options, together with either integral connector or cable gland connection.The products sit alongside the WindObserverII (65m/s max wind speed) and WindObserverIS (75m/s max wind speed, Intrinsically Safe approved) wind sensors. The launch of WindObserver70 and WindObserver75 follows the recent introduction of WindSonic M, a hard-anodized aluminium ultrasonic wind sensor with optional anti-icing heating system.WindObserver70 and WindObserver75 are now available and WindObserver75 will be demonstrated at HUSUM WindEnergy – the leading wind energy trade fair trade fair, in Husum, Germany on 18-22 September 2012.