Vaisala Background Luminance Sensor LM21
    Overview
     

     Overview

    		 
      • Intelligent, stand-alone sensor
      • Easy to integrate with Vaisala LT31, FS11, MITRAS and FD12 sensors
      • Extensive self-diagnostics
      • Window contamination measurement and compensation
      • Optical path blockage detection
      • High power heaters to prevent snow accumulation
      • Calibration traceable to measurement standards
      • Field calibration device available
      Technical Specifications
       

       Technical Specifications

      		 

      Performance

       

      Measurement range
      Measurement accuracy

          2 ... 40 000 cd/m2
          10%

      Operating environment

       

      Temperature
      Humidity

      -40...+65 °C
      0...100 %RH

      Inputs and outputs

       

      Operating voltage
      Power consumption
      Outputs

      10…38 VDC or 8…28 VAC
      6W, 50W with defrosting heaters
      RS232, RS485, frequency output

      Mechanics

       

      Dimensions
      Weight

      154 (h) x 100 (w) x 142 (l)  mm
      1.1 kg

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

       
      Documents