Surface Sentinel Temperature Sensor – Model 5439-00

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.

FEATURES:

  • Trigger ITS Devices Directly from Sensor
  • Low Power for Solar Installations
  • SDI-12 Interface: Simple Integration w/Industry-Standard Dataloggers
  • Fan provides Air Temp/RH Aspiration
SKU: 5439-00 Categories: , , Tag:

Description

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.

Applications

  • Low cost way to fill in gaps between existing weather stations
  • Alert vehicle operators or pedestrians of hazardous weather conditions by locally or remotely triggering flashing warning signs. Example, “ROAD MAY BE ICY”
  • Alerting paint stripe crews that the road temperature is ready to start work
  • Alert when the road or sidewalk might be too warm and could start to see buckling

Specifications

Surface Temperature Range -40° to 185° F (-40° to 85° C)
Surface Temperature Accuracy ±1° F at 32° F otherwise ±2° F (±0.5° C at 0° C otherwise ±1° C)
Surface Temperature Reaction Time 63% of step change in 1 Second
Air Temperature Range -40° to 149° F (-40° to 65° C)
Air Temperature Accuracy ±0.4° F at 32° F otherwise ±1° F (±0.2° C at 0° C otherwise ±0.5° C)
Air Temperature Reaction Time 63% of step change in 15 Minutes
Humidity Range 0 to 100%
Humidity Accuracy ±1.8% at 10% to 90% RH otherwise ±3%
Humidity Reaction Time 63% of 35% to 80% step change in 12 Seconds
Measurement Time Less than 1.0 second, fan off.
Measurement Distance Range 3 to 50 ft (1 to 15 m)
Elevation Angle 35 to 90° from vertical
Field of View 12°
Measuring Area 2 ft (0.6 m) diameter at 10 ft (3 m)
Fan Power Management Based on Light Level
Default Emissivity Setting 0.96
Outputs SDI-12, Open Collector
Operating Voltage 9.6 to 16 VDC
Current Draw 170 µA (average at 2 minute measurement without fan); 210 mA (max with fan running) at 12 VDC, 7 mA (when measuring, without fan)
Cable 33 ft (10 m) standard
Mounting 2×2 in (5.1×5.1 cm)spaced 1/4 inch – 20 threaded PEM nuts
Materials Anodized aluminum, polycarbonate
Operating Temperature -40° to 185° F (40° to 85° C)
Operating Humidity 0 to 100% RH
Dimensions 8x3x3 in (20x8x8 cm)
Weight 2 lbs (0.9 kg)
Shipping Weight 4 lbs (1.8 kg)
Warranty 2 years from date of shipment

Ordering Guide

Model 5439-00 Surface Sentinel Surface Temperature Sensor Includes: 33 ft (10 m) Cable with tinned leads

 

Model 5439-01 Surface Sentinel Surface Temperature Sensor Includes: 33 ft (10 m) Cable with RS-485 RWIS RPU interface
Model 5439-02 Surface Sentinel Surface Temperature Sensor with Fan, SDI-12, 33 ft (10 m) Cable with MS connector

 

Optional

Model 5439-70 Pole Mounting Bracket, 1 to 2 inch (2.5 to 5.1 cm) Diameter

 

Model 5433-70 Pole Mounting Bracket, 3 to 8 inch (7.62 to 20.3 cm) Diameter

 

 

 

Support

 

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