CS120A/CS125
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CS120A/CS125Visibility and Present Weather Sensors Visibility and Present Weather Sensors Visibility and weather detection at an economical price The CS120A and CS125 are infrared forward scatter visibility and present weather sensors for stand alone use or with automatic weather stations. They use the well established forward scatter system for visibility measurement, utilising a 42° scatter angle which gives accurate estimates of Meteorological Observable Range (MOR) for fog and snow.1 The CS125 identifies precipitation particles from their scattering properties and fall speeds, and combines this with a temperature measurement to identify the weather type. They have downward pointing optics that reduce the risk of contamination of the optics and blockage with snow.2 This also means that direct sunlight will never shine directly into the optics. Interference to the sample volume from the sensor by flow distortion or heat is minimised by keeping it clear of the hood and electronics box. The CS125 also provides reliable present weather information including information on the intensity of precipitation. Accumulation can also be reported. Both sensors use continuous high speed sampling to reduce errors during mixed weather events and events that return intermittent signals such as rain and hail, while still providing reliable readings during more stable events such as fog and mist. They have high immunity to interference from the visible and infra-red warning lights used to mark obstructions such as wind turbines or obstacles near runways. The sensors can be set to a lower sampling frequency to save power, if required. They incorporate low power dew prevention heaters and higher power anti-icing heaters for the hoods as standard. These are automatically controlled to ensure operation in all weathers or can be disabled to save power. Both continuously monitor their own status and will report faults and contamination of the sensor lenses. They also have two user configurable alarm outputs. A CS215 temperature and relative humidity sensor can be fitted to the CS125. This gives better performance in identifying precipitation and allows relative humidity information to be transmitted. The CS120A and CS125 comply with ICAO, FAA and UK CAA guidance and meet or exceed all recommendations and specifications (this includes ICAO 9837, ICAO Annex 3, CAP437, CAP670 and CAP746). Certified by Deutscher Wetterdienst as suitable for use to control wind turbine obstruction light systems as specified by 506/04, General Administrative Rules for the Identification of Aircraft Obstructions. 1U.S. Department of Transportation, FAA 1997 ref. DOT/FAA/AND-97/1 2 ICA09328 8.2.6 b) / Road weather / Automatic weather stations / Airport visibility and Runway Visual Range / Wind farms / Marine weather stations / Solar farms Benefits and Features / High performance visibility and present weather sensors at an economical price / Uses established 42° scatter angle for good MOR readings in all precipitation types / Incorporates both dew and hood heaters for all-weather operation / The CS125 gives present weather and precipitation accumulation / RS-232/RS-485 and logic level alarm outputs / Simple field calibration with optional calibration disk including dirty window zero offset correction / Low power - suitable for remote applications / Automatic fault/contamination detection / Sample volume clear of disturbance from the mounting and the electronics enclosure / Type certified for Aviation use by the German Meteorological Service, Deutscher Wetterdienst (DWD)

Operational Specifications i Maximum reported visibility: 75 km (approx. 47 miles) i Minimum reported visibility: 5 metres (16 feet) # Accuracy: <600 m ±8% 600-10,000 m ±10% 10,000-15,000 m ±15% 15,000-75,000 m ±20% i Resolution: 1 metre i Operating temperature: -25 to +60°C i Extended operating temperature: -40 to +70°C option # Operating humidity: 0 . . . 100% i Wind speed: Up to 60 m/s i Sensor sealing: rated to IP66 CS125 only # Present and past weather: identifies as standard mist, fog, drizzle, freezing drizzle, drizzle and snow, rain, freezing rain, rain and drizzle, rain and snow...