FEATURES

• Measures atmospheric visibility (meteorological optical range) by determining the amount of light scattered by particles (smoke, dust, haze, fog, rain, & snow) passing through the optical sample volume.
• A 42-degree forward scatter angle is used to ensure performance over a wide range of particle sizes.
• MOR is calculated by converting the received signal strength (extinction coefficient, σ) using Koschmeider's formula, MOR (Km) = 3/σ.
• Performance in all weather conditions is achieved with an integrated sensor design that keeps all sensor cabling internal to the sensor for complete protection against the weather.
• Made from anodized aluminum and rugged, UVresistant fiberglass enclosures rated to IP66.
• Based on the proven field experience of the NWS and FAA, the sensor uses a "look down" geometry to reduce window contamination and clogging from blowing snow.
• The optical windows have continuous duty anti-dew heaters and optional thermostatically controlled external hood heaters are available for protection in extreme environments.
• All power and signal lines to the Visibility Sensor are protected with surge and EMI filtering to guarantee uninterrupted service for the life of the sensor.
• Installation and maintenance are simple. A mounting flange located on the bottom of the Main Enclosure Box mates with a user supplied 1-1/2 inch IPS mounting pipe.
• Power and signal cables are installed through waterproof cable glands on the bottom of the Main Enclosure Box to terminal boards for simple but reliable connections.
• Calibration in the field is simple. Attach a factory supplied calibration fixture and follow a short procedure (<30 min.) Semiannual calibration is recommended
• This equipment is in compliance with the essential requirements and other provisions of Low Voltage Directives 73/23/EEC 89/336/EEC as amended by Directive 93/68/EEC.