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Vaisala Ceilometer CL31 Second generation of advanced single lens optics provides excellent performance also at low altitudes Reliable operation in all weather: unsurpassed performance in vertical visibility and cloud detection during precipitation Fast measurement enables detection of thin cloud layers below a solid cloud base Modular design for easy installation and maintenance Extensive self-diagnostics with fault analysis Approved and deployed by the US-FAA Selected by the National Weather Service of USA Performance Measurement range Reporting resolution Measurement cycle 0...25,000 ft ((0...7.5 km) 5 m /10 ft (units selectable) programmable, 2...120 s Reported quantities Cloud hits (up to 3 layers) and status information Cloud hits, status and backscatter profile Operating environment Temperature Relative humidity Wind -40...+60 °C (-40...+140 °F) 0...100 %RH 55 m/s Inputs and outputs Operating voltage Power