User manual VAISALA PWD20 BROCHURE

[. . . ] 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-theshelf 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. [. . . ] 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. 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. The PWD22 is recommended for Automatic Weather Observation Systems (AWOS). Easy installation For meteorological and aviation applications PWD12 is ideal for road weather applications. PWD-series sensors can be used in planning the road maintenance. A With a visibility measurement range of 10. . . 20, 000 meters, the Vaisala Present Weather Detector PWD22 is a two-inone 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. 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 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 Technical Data Present weather PWD12 Identifies Reports WMO 4680 (SYNOP) and NWS code tables 39 different codes supported from WMO 4680 code table PWD22 Identifies 7 different types of precipitation (rain, freezing rain, drizzle, freezing drizzle, mixed rain/snow, snow, ice pellets) Fog, mist, haze (smoke, sand) or clear 4 different types of precipitation (rain, drizzle, mixed rain/snow, snow) Fog, mist, haze (smoke, sand) or clear Electromagnetic compatibility CE-compliant Compliance has been verified according to the following EMC directives Verification subject Standard Radiated emissions CISPR 16-1, 16-2 Radiated susceptibility IEC 61000-4-3, 10 V/m Conducted emissions CISPR 16-1, 16-2 Conducted susceptibility IEC 61000-4-6 EFT immunity IEC 61000-4-4 ESD immunity IEC 61000-4-2 Surge IEC 61000-4-5 Accessories/options Luminance sensor PWL111 for AWOS applications Hood heaters for winter conditions Support arm for mast installations Pole clamp kit for mast top installations Calibration set PWA11 Maintenance cable 16385ZZ Reports WMO 4680 (SYNOP), 4678 (METAR) and NWS code tables 49 different codes supported from WMO 4680 code table Precipitation measurement Precipitation intensity, accumulation and amount of new snow Precipitation detection sensitivity 0. 05 mm/h or less, within 10 minutes Measures Dimensions Visibility measurement Operating principle PWD10 and PWD12 Measurement range (MOR) PWD20 and PWD22 Measurement range (MOR) Accuracy Forward scatter measurement 10. . . 2000 m (32. . . 6500 ft) 10. . . 20 000 m (32. . . 65 600 ft) ±10%, range 10. . . 10 000 m ±15%, range 10. . . 20 km Electrical Power supply Power consumption PWD10 and PWD20 12 V DC. . . 50 V DC (electronics) 24 V AC or 24 V DC for heater option 3W (electronics with dew heater @12VDC) 6W PWD12 and PWD22 Options 2 W (luminance sensor with dew heater) 65 W (heater option) Outputs RS-232, RS-485 Three programmable relay controls, visibility alarm threshold and delays configurable, fault alarm relay 0 . . . 20 mA analog current Mechanical Dimensions Weight 40. 4 (w) x 69. 5 (l) x 19. 9 (h) cm (15. 91" (w) x 27. 36" (l) x 7. 83" (h)) 3 kg (6. 61 lb) -40 . . . ©Vaisala Oyj Environmental Operating temperature Operating humidity Protection class 132 Vaisala Instruments Catalog 2005 Ref. [. . . ] The measurement capabilities of the Vaisala PWDseries sensors can be extended when your measurement needs grows. All PWD-series can be economically upgraded to ensure that your PWD sensor gives full value for many years to come. Vaisala Instruments Catalog 2005 Ref. [. . . ]