"FD70 Series is the seventh generation of Vaisala visibility and present weather sensors. It is designed based on more than 30 years of forward scatter technology development experience. This technology innovation sets a new standard in precipitation identification, quantification, and visibility determination accuracy.FD70 Series product models:","Features  • Reports visibility up to 100 km (62 mi)  • Reports precipitation type, intensity, and accumulation  • Exceptional precipitation detection sensitivity  • Precise type identification even for low-intensity precipitation  • Superior liquid\/frozen differentiation  • Optimal forward scatter angle 42°  • Look-down geometry to minimize measurement disturbances","Key Benefits","  • Best-in-class 3-in-1 performance: visibility, present weather, and precipitation quantification   • Accurate visibility measurement with proven calibration traceability and a range of up to 100 km   • Significant enhancement of drizzle, freezing rain, hail, and ice pellet identification"

"For Runway Visual Range (RVR) assessment and airport visibility measurements","Accurate and reliable, WMO and ICAO compliant determination of the Runway Visual Range (RVR) reduces airport downtime and improves safety of operations. The Vaisala Transmissometer LT31 is the qualified observer of RVR providing correct visibility data without interruptions and with minimal maintenance.","Features  • Single baseline for the measurement range 10...10 000 m MOR  • State-of-the-art white light source  • Window contamination compensation  • Sophisticated self-diagnostics  • Internal back-up battery  • Meets the ICAO ad WMO requirements for RVR and visibility  • Based on decades of field experience  • Compatible with Vaisala Transmissometer MITRAS and SKOPOGRAPH II Flamingo","Key Benefits"," • Measurement range from 10 to 10 000 m   • The LT31 provides the most accurate and reliable solution for the automatic measurement of RVR.The Meteorological Optical Range (MOR) measurement range is from 10 to 10 000 meters, which covers the full required RVR range (CAT I ... CAT IIIb), as well as the range required for Aeronautical Visibility (the ICAO defined visibility). The accuracy of the LT31 meets the ICAO and WMO requirements.  • Automatic calibration with integrated forward scatter sensor   • Calibration of a transmissometer is traditionally based on human observations. A reliable and accurate calibration has required very high visibility, stable conditions, and skilled and well trained personnel. The Vaisala patented automatic calibration method for transmissometers is based on an integrated forward scatter sensor\/present weather sensor. The system automatically detects drift and adjusts the sensor settings accordingly. Weather conditions do not need to be as good as for manual calibration; the LT31 automatically recognizes suitable conditions.  • Contamination Reduction   • In general, precipitation leads to an increased amount of window contamination. The LT31 has long and narrow weather protection hoods that reduce the amount of window contamination caused by precipitation.  • Automatic window contamination compensation   • Window contamination is a significant source of error in transmissometers. Maintaining high accuracy has required frequent cleaning. However, the effects of contamination can be automatically compensated if the window transmittance can be measured accurately.  • White LED provides wide spectrum light source   • The LT31 incorporates a white LED as a light source. White light is needed for the best accuracy in transmittance measurement. The WMO recommends the use of a wide spectrum (white) light sources for transmissometers as narrow spectrum light source (e.g. lasers or colored LEDs) will cause measurement error with some weather phenomena.  • Extensive self-diagnostics   • The LT31 has a sophisticated self-diagnostics that provides detailed status information for all functional units. In addition, this feature helps to locate possible technical failures. It records a history of significant operational situations, warnings, and alarms from the instrument."

"Runway visual range assessment and airport visibility measurement selected by FAA","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. FS11P is intended for the most demanding weather applications such as runway visual range (RVR), aeronautical and synoptical visibility, and present weather observation. Selected by German Weather Service DWD.","It provides the optimal combination of the best accuracy, the highest reliability, broad measurement range, and low maintenance need.","Features  • Specially built for Runway Visual Range (RVR) applications  • Meets FAA and ICAO specifications  • Mechanical design and high-power heating  • Can also be used for aeronautical and SYNOP visibility measurements","Key Benefits"," • Meets FAA and ICAO specifications   • The Meteorological Optical Range (MOR) measurement range is from 5m to 75 000 meters, which covers the full required RVR range (CAT I ... CAT IIIb), as well as the range required for Aeronautical Visibility (the ICAO defined visibility).  • Minimal look-down geometry   • The second is \"head-down\" design of the optical heads, which protects them against virtually all windblown particles (even those flying horizontally).  • Accurate and traceable measurement   • Scientifically valid chain of calibration. Every Vaisala FS11 is calibrated through a scientifically valid chain of reference."

"Accurate and traceable measurement of prevailing visibility","PWD50 offers perfect solutions for a variety of visibility measurement applications e.g. meteorological weather stations, heliports, offshore and maritime visibility measurement.","Features  • Accurate, traceable measurement of prevailing visibility  • Robust and dependable","Key Benefits"," • Versatile and easy to install; easy to integrate   • The PWD50 architecture allows for easy integration to existing or newly designed systems in a cost-efficient manner. The sensor can be mounted in many ways on existing masts.  • Weather-proof design reduces need for maintenance   • The downward-facing sensor hoods protect the optical surfaces from contamination, resulting in low maintenance needs and costs.  • Wherever visibility measurement is needed   • Long-range visibility measurement for diverse applications covering harbors, coastal areas, heliports, wind turbine applications – indeed, any locations or areas where visibility measurement is necessary."

"For accurate visibility measurement","Sensors designed for a variety of visibility measurement applications, including: road weather, waterway visibility measurement, and wind turbine applications such as obstruction light control.","Features  • Robust and versatile  • Accurate measurement of visibility","Key Benefits"," • ​Accurate and traceable   • PWD sensors use the proven forward-scatter measurement principle to measure meteorological optical range (MOR).  • Easy installation   • All Vaisala's PWD sensors are compact (less than one meter long), light-weight, and come with a cable and connector for easy installation, which can be mounted in multiple ways on any existing mast.  • PWD20W - ideal for wind turbine applications   • The challenging conditions on top of a wind turbine require a robust and reliable device like the Visibility Sensor PWD20W, which cost-effectively supports obstruction light control and a range of other wind applications."