Campbell Scientific CS120 atmospheric visibility sensor

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The CS120 is an infrared forward scatter visibility sensor for road, marine and airport-based weather stations. It uses infrared forward-scatter technology with a 42° scatter angle that provides accurate measurements in fog and snow. The scatter angle allows the product to accurately measure atmospheric visibility for the range of 10 to 30,000 m.

The product uses continuous high-speed sampling, which improves the accuracy of measurements taken during mixed weather such as rain and hail, while providing reliable readings during more stable events such as fog and mist. High-speed sampling also allows the sensor to better respond to suddenly changing conditions.

The product has several design features that keep its optics clean. Downward-facing optics minimise dirt and snow build-up. Low-powered heaters prevent the formation of dew and a higher-powered heater prevents the formation of ice.