Some countries have established regulations for reducing intensity of obstruction lights based on visibility. The PWD series of weather detectors and visibility sensors offers a variety of visibility measurement ranges (MOR). It also characterizes reduced visibility, identifies precipitation, measures accumulation and intensity, and offers different report formats.
The PWD12 and PWD22 by Vaisala identify precipitation by estimating water content with a capacitive device and combining that information with optical forward scatter and temperature measurements. These three independent measurements produce an evaluation of the weather type according to the World Meteorologial Organization and National Weather Service code tables.
The visibility sensor is well-protected against contamination. The optical components point downward and hoods protect the lenses against precipitation, spray, and dust.
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