The Model 5439 Surface Sentinel non-intrusive surface temperature sensor provides surface temperature, air temperature, relative humidity and dew point measurements for warning systems and fixed weather stations. Premium materials are used to meet the demands of road weather professionals.
The surface temperature is measured by an accurate non-contact infrared temperature sensor. Air temperature and relative humidity are measured from an accurate sensor from which dew point is calculated. The sensor has an integrated fan for applications where higher accuracy air temperature and relative humidity readings are needed.
The sensor is typically mounted on a pole or tower next to a road surface. It can be used for remote monitoring or in an autonomous system.
In the remote monitoring configuration, the Surface Temperature Sensor can be connected to dataloggers or transmitters, such as the Model 3512 or Model 3306, to send data to a central software system. The standard open-architecture data output is available via the Surface Temperature Sensor’s SDI-12 to provide a common interface for retrieving the atmospheric and road data from the sensor.
In the autonomous system configuration, the contact output can be used to trigger ITS devices based on user-defined sensor thresholds. An example would be to trigger a “BRIDGE MAY BE ICY” sign when the bridge surface is near or below freezing.