Vaisala Background Luminance Senso LM21

Fully featured instrument designed for Runway Visual Range (RVR) Intelligent, stand-alone Background Luminance Sensor (An Ambient Light Sensor) for Runway Visual Range (RVR) and ICAO airport visibility systems. Easy to integrate with Vaisala LT31 and FS11 sensors. Features  • Intelligent, stand-alone sensor  • Verified accuracy and photopic response  • 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  • Easy to calibrate Key Benefits • Easy to calibrate   • The calibration of LM21 is traceable to international measurement standards for luminous intensity. Calibration starts automatically when Vaisala Field calibrator LMA21 is connected to LM21.  • Resembles Human Eye   • LM21 is a precision photometer with a verified photopic spectral response. It measures the total amount of light coming in from an angle of 6 degrees, and converts the measured data to cd/m2.  • Comprehensive Self-Diagnostics   • LM21 is an intelligent, standalone sensor. To ensure reliable and uninterrupted operation, it has extensive self-monitoring functions with high power heating features.