Model 8365-A Dual Technology Visibility Sensor

The 8365-A Dual Technology Visibility Sensor measures transparency of the atmosphere and calculates its extension coefficient and meteorological optical range (MOR) values. Using both direct attenuation and forward scatter technologies, the 8365-A can measure airborne particle sizes once available only from a transmissometer, while having the reliability and cost-effectiveness of a forward scatter visibility sensor. Its precision makes it ideal for applications requiring the highest in performance and reliability, such as aviation and meteorological studies.The Model 8365-A determines visibility by measuring the optical extinction coefficient of a beam of light as it passes through a known volume of air. Any particles in the air such as fog, rain, or snow will affect the extinction coefficient. This value can then be transmitted to an external computer in its unaltered form or translated into an equivalent MOR value in miles or kilometers covering a range of 33 feet to 20 miles (10 meters to 32 kilometers).In AWOS systems, the extinction coefficient value is sent to the Model 1190 Data Collection Platform (DCP), which passes the value along with sensor status information to the Model 2090 Central Data Processor (CDP). The CDP then calculates visibility, variable visibility, and RVR (international systems only) over a visibility range of 33 feet to more than 20 miles.When used in AWOS systems, the 8365-A sensor does not require the optional Handheld Terminal; all setup, test, and calibration functions are accessible from the AWOS DCP's built-in keypad and display. Other AWOS features include support for a Day/Night sensor and an ambient light sensor (ALS), which is required for RVR applications. For 220VAC applications, a transformer kit is available to allow the sensor (which normally operates at 110V, 60 Hz) to operate from a 220V, 50 Hz AC supply.The Model 8365-A utilizes a unique two-sensor design that eliminates measurement errors and simplifies calibration. The sensing portion of the sensor (optical emitters and detectors) operates in conjunction with a visibility controller, which performs control functions for the emitters and detectors, performs built-in test and calibration functions, processes data, and calculates the extinction coefficient product. Dual Technology Visibility SensorFor more information, please visit Why Four Heads are Better Than Two Heads & Even Better Than a TransmissometerPerformanceMeasurement range (MOR) 33 feet to 20 miles (10 meters to 32 kilometers) Accuracy