Visibility & Present Weather Sensors FS11 & FS11P Accurate weather observation data for runway visual range, aeronautical, and synoptical applications. Accurate Visibility Measurements Accurate Visibility Measurements Vaisala sensors FS11 and FS11P are forward scatter sensors that can be used in the most demanding weather situations. The FS11 measures visibility, while the FS11P additionally measures present weather. Both sensors provide accuracy, reliability, broad measurement range, and low maintenance in weather applications such as runway visual range (RVR), aeronautical and synoptical visibility, and present weather observation. To ensure reliable operations — even in the harshest weather conditions — the FS11 and FS11P utilize four main design features: Window contamination compensation “Head-down” optics High-powered heaters Optical path clearance monitoring FS11 FS11 Designed according to ICAO, FAA, and WMO guidelines, the FS11 is an ideal instrument for runway visual range (RVR) assessment and airport visibility measurement, as well as other demanding applications. It provides the optimal combination of the best accuracy, the highest reliability, broad measurement range, and low maintenance needs. FS11P FS11P The FS11P offers traceable visibility measurement and precipitation type detection for runway visual range (RVR), aeronautical and synoptical visibility, and present weather observation for demanding weather applications. The sensor is designed to detect precipitation type and intensity and is the most widely proven forward scatter RVR sensor that is selected and used by the FAA. Additionally, it is the most widely proven present weather sensing technology. Industry Applications Aviation Ensure safe and efficient airport operations in any weather with our comprehensive selection of weather and runway management solutions. LEARN MORE Meteorology Protect people and communities from the impacts of day-to-day and extreme weather with the industry's most accurate and reliable weather observation solutions. LEARN MORE Get Started with Visibility and Present Weather Sensors FS11 and FS11P Contact Vaisala to learn more about the reliability and broad measurement ranges the FS11 and FS11P have to offer — and find out which model is right for your needs. CONTACT US Resources MORE DOWNLOADS FS11/FS11P Product Support & Scientific Downloads Click here to explore additional product resources for FS11/FS11P. READ MORE DATASHEET Visibility Sensor FS11 Read more about the benefits and technical specifications of the Visibility Sensor FS11. DOWNLOAD PDF DATASHEET Visibility and Present Weather Sensor FS11P Read more about the benefits and technical specifications of the FS11P. DOWNLOAD PDF Success Stories Measuring Weather At The World’s Highest Airport SUCCESS STORY: See how Daocheng Yading Airport in China stays safe during weather extremes. READ MORE