The RWIS Road Visibility Sensor – Model 5434-00 measures atmospheric visibility for use in Road Weather Information System (RWIS) Environmental Sensor Stations (ESS). The RWIS Road Visibility Sensor is designed to perform in all types of weather conditions. An integrated, one-piece housing keeps all cabling internal to the RWIS Road Visibility Sensor for ultimate protection against the elements. The RWIS Road Visibility Sensor housing is made from anodized aluminum and the enclosures are rugged, UV-resistant fiberglass rated to IP66. Based on the proven experience of the NWS and FAA, the RWIS Road Visibility Sensor uses a “look down” geometry to reduce window contamination and clogging from blowing snow. The windows use continuous-duty anti-dew heaters. As an option, thermostatically controlled external hood heaters are offered for protection in extreme environments. All power and signal lines to the RWIS Road Visibility Sensor are protected with surge and EMI filtering to help guarantee uninterrupted service for the life of the sensor.

Installation and maintenance is minimal for the RWIS Road Visibility Sensor. A flange located on the bottom of the RWIS Visibility Sensor signal processing box mates with a user supplied 1-1/2 inch IPS pipe. Power and signal connections are made through waterproof cable glands to terminal boards in the RWIS Road Visibility Sensor’s Signal Processing Box.

Calibration of the RWIS Road Visibility Sensor in the field is as simple as connecting a factory supplied calibration fixture and following a simple procedure that takes less than 30 minutes. HSE recommends annual calibration for the RWIS Road Visibility Sensor.