
Present Weather Detectors and Visibility Sensors PWD Series
Vaisala Present Weather and Visibility Sensors PWD series deliver a mix of meteorological optical range (MOR), characterization of reduced…
FD70
FD70 is powerful technology that can potentially replace many separate sensors such as your visibility and present weather sensor, rain gauge, disdrometer, and freezing rain sensor. It can also outperform them in delivering highly accurate visibility and precipitation reporting in all weather conditions, as well as unsurpassed detection sensitivity and reliable identification of present weather.
Request a quoteDownload the datasheet
The FD70 is engineered to meet WMO SYNOP reporting guidelines for precipitation and obscuration types. Its sensors excel with fast response times and the highest sensitivity to correctly detect and identify individual droplets. They provide accurate visibility measurement with proven calibration traceability and a range of up to 100 km (62 mi) and are the first sensors on the market that can reliably report a full range of present weather types including freezing precipitation.
Software version in production: v3.8. This new software is available and complimentary to FD70 customers via HelpDesk.
Vaisala’s pioneering sensor design provides constant, reference-grade performance unlike any other forward scatter technology — even for incidents of freezing rain, ice pellets, intense precipitation, or mixed precipitation.
State-of-the-art, forward scatter technology detects and analyzes current precipitation to identify type, intensity, accumulation, particle size and fall speed distributions with a visibility sensor range up to 100 km (62 mi) Meteorological Optical Range (MOR).
The high sensitivity of the FD70 sensor means it’s able to detect precipitation onset right from the first droplets, and it reacts quickly to meteorological visibility changes from 1m to 100km (3ft to 62mi).
Take an in-depth look at FD70 with our webinar on demand, including:

Understand the threat*
affected globally by sand & dust storms (That's approximately 4% of the globe's population) of dust emitted annually (That's the equivalent of 307 Great Pyramids of Giza.) * World Meteorological Organization, Sand and dust storms, 2025
Detect early, act fast
Vaisala Forward scatter sensor FD70Detects sand/dust vs. water-based particles Reduces false alerts with precise visibility data Vaisala lidar ceilometer CL61Identifies sand/dust layers through depolarization Tracks storm movement for early warnings Vaisala WindCube® Scan360°/3D wind and aerosol tracking up to 10 km Enables storm trajectory monitoring
Build resilience
Combine sensors for full situational awareness and enable proactive decisions to protect people, assets, and operations.

Vaisala Present Weather and Visibility Sensors PWD series deliver a mix of meteorological optical range (MOR), characterization of reduced…

The Vaisala CL61 ceilometer is a first-of-its kind technology that combines standard ceilometer measurements, like cloud base and ceiling heights…

The Background Luminance Sensor LM21 is a precision photometer with a verified photopic spectral response.

By measuring light attenuation (reduction in light) between the transmitter and receiver, the LT31 is thus independent of the type of visibility…
Instruments to quote
No instruments yet. An enquiry can be sent anyway: a specialist answers.