Background Luminance Sensor LM21

Fully featured ambient light sensor for Runway Visual Range (RVR) applications.

The Background Luminance Sensor 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 to assess the visibility range of runway lights or warning lights.

The LM21 features:

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
Easy-to-use field calibration device available

It integrates with the Vaisala Transmissometer LT31 and Vaisala Forward Scatter FD70, FS11, or FS11P to create an expanded runway visual range (RVR) system.

COMPREHENSIVE SELF DIAGNOSTICS

EASY CALIBRATION

Industry Applications

Aviation

Ensure safe and efficient airport operations in any weather with our comprehensive selection of weather and runway management solutions.

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Meteorology

Protect people and communities from the impacts of day-to-day and extreme weather with the industry's most accurate and reliable weather observation solutions.

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Get Started with Background Luminance Sensor LM21 Today

Contact Vaisala to learn how this stand-alone ambient light sensor can deliver crucial data while helping simplify your Runway Visual Range (RVR) system.

Datasheet