P.O. Box 26, FIN-00421 Helsinki, FINLAND
Tel: +358 9 894 91
Fax: +358 9 8949 2485
Email: metinstruments@vaisala.com
www.vaisala.com
PWD10, PWD12, PWD20 and PWD22
Present Weather and Visibility Sensors
Features/Benefits
All models:
• Accurate measurement of prevailing visibility
• Compact and light-weight
• Easy to install
Additionally PWD12 and PWD22 models:
• Indicate the cause of prevailed visibility
• Detect precipitation type
• Measure the intensity and accumulation of precipitation
• Estimate snow accumulation
Vaisala PWD-series of present weather detectors and visibility sensors provide you off-the- shelf accuracy and realiability. They are a sensor family that grows with your needs.
Thousands of Vaisala present weather and visibility sensors are installed around the world, working reliably and accurately in diverse applications and climates. In the Vaisala PWD-series of present weather detectors and visibility sensors, you will find the mix you require of visibility measurement range (MOR), characterization of reduced visibility, precipitation type identification, precipitation accumulation/intensity measurement, and report formats (WMO, NWS code tables).
Proven measurement principles for present weather
The Vaisala Present Weather Detectors PWD12 and PWD22 identify precipitation type by accurately estimating the water content of precipitation with a capacitive device (Vaisala RAINCAP® sensor element) and combining this information with optical forward scatter and temperature
measurements. These three independent measurements are processed through sophisticated algorithms in order to produce an accurate evaluation of the weather type according to the WMO and NWS code tables.
Accurate visibility measurement
Calibrated with reference to a highly accurate transmissometer, Vaisala PWD-series sensors use the proven forward-scatter measurement principle to measure Meteorological Optical Range (MOR). The visibility sensor is well-protected against contamination: the optical components point downwards and hoods protect the lenses against precipitation, spray and dust. This weather-proof design of the PWD sensors provides accurate measurement results and reduces the need for maintenance. The optional hood heaters are recommended for wintry conditions to prevent ice and snow accumulation.
Economical visibility measurement for road weather applications
With a measurement range of 10...2,000 meters, the Vaisala Visibility Sensor PWD10 offers economical and reliable visibility measurement for road weather applications. The PWD10 is recommended for road weather systems which alert drivers to e.g. reduced visibility.
130 |
Vaisala Instruments Catalog 2005 |
Ref. B210435en rev. A
PWD-series |
PRESENT WEATHER, VISIBILITY |
The PWD22 is recommended for Automatic Weather Observation Systems (AWOS).
PWD12 is ideal for road weather applications.
PWD-series sensors can be used in planning the road maintenance.
Vaisala Instruments Catalog 2005
The Vaisala Present Weather Detector
PWD22.
For sophisticated road weather applications
The Vaisala Present Weather Detector PWD12 provides accurate visibility and present weather measurement in the road environment, where low visibility is a serious safety hazard and significantly reduces traffic flow rates. With a visibility measurement range of 10...2,000 meters, the Vaisala Present Weather Detector PWD12 is ideal for road weather applications. The PWD12 also indicates the cause of reduced visibility to give you a full picture of weather conditions. Its ability to detect precipitation and identify precipitation type gives the road authority valuable information for the short-range planning of road maintenance operations.
For meteorological and aviation applications
With a visibility measurement range of 10...20,000 meters, the Vaisala Present Weather Detector PWD22 is a two-in- one forward scatter visibility and present weather sensor. The PWD22 is recommended for automatic weather stations (especially low-power AWSs) that are used for general meteorological and aviation applications. The PWD22's ability to detect freezing precipitation makes it possible to issue warnings when the weather presents safety hazards for road and air traffic.
The PWD22 is equipped with two
Vaisala RAINCAP® sensor elements to improve detection sensitivity during light precipitation events – even light drizzle is detected. The PWD22 also reports present weather in WMO METAR code format so it is easily integrated with AWOS systems.
Wherever visibility measurement is needed
With a measurement range of 10...20,000 meters, the Vaisala Visibility Sensor PWD20 offers long-range visibility measurement for diverse applications covering harbors, coastal areas, heliports, windmill parks – indeed, any locations or areas where visibility measurement is necessary.
Easy installation
PWD sensors are less than one meter long. All are compact, light-weight, come with a cable and connector for easy installation, and can be mounted in many ways on any existing mast.
Expandable measurement capabilities
The measurement capabilities of the Vaisala PWD-series sensors can be extended when your measurement needs grow. All PWD-series sensors can be economically upgraded to ensure that your PWD sensor gives full value for many years to come.
131
Ref. B210435en rev. A
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