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Vaisala Ceilometer CL31

Ceilometer CL31 to measure cloud height for meteorological applications.


      • 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
      Technical Specifications

       Technical Specifications



      Measurement range
      Reporting resolution
      Reporting cycle

      0...25,000 ft ((0...7.6 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


      Relative humidity

      -40...+60 °C (-40...+140 °F)
      0...100 %RH
      55 m/s

      Inputs and outputs


      Operating voltage
      Power consumption

      100/115/230 VAC
      max. 310 W including heating
      ITU-T V.21, V.22, V22bis



           Measurement unit
           Measurement unit
      Housing classification

      1190 x 335 x 324 mm
      620 x 235 x 200 mm

      32 kg
      13 kg

      For complete specifications, please see the brochure in "Documents".

      Related Services
      • Service Center Calibration 
      • Software Upgrade 
      • The Vaisala software upgrade service gives you rapid access to the latest updates for your equipment software, making it easy for you to benefit from the latest advances in Vaisala software technology.
      • Repair Services 
      • Vaisala repair services include fault tracing and repair or replacement of failed components, as well as final testing to ensure your equipment is functioning properly. Repairs can be carried out on site or at one of our service centers.
      • Spare Parts 
      • Get rapid access to the spare parts you need to maximize the uptime of your equipment and ensure reliable and accurate operation. In addition to standard spare part delivery, we also offer an express service where parts are shipped within one business day.
      • Warranty 
      • All Vaisala products and services are covered by a 12-month warranty as standard, with selected products covered for up to 24 months. During this period you benefit from free repair or replacement of faulty equipment.
      • Vaisala Ceilometer CL31 Operator and Maintenance Training