In-pavement Surface Temperature and Condition Sensor – Model 5721-01

The In-pavement Surface Sensor – Model 5721-01 is designed as a low cost, in-road sensor unit for integration with other field devices in an ITS Network.


  • Monitors real-time road/pavement surface conditions
  • Detects temperature and dry, wet, ice-watch, chemically wet
  • DIN rail or enclosure for easy mounting
SKU: 5721-01 Categories: ,


The Model 5721 Passive Road Surface Sensor provides actionable information about the roadway to road weather professionals. The sensor is installed in the roadway and measures the surface temperature and the surface condition as dry, wet, ice watch and chemically wet. The sensor is well suited for roadways, ice-prone bridges, elevated roadways, entryways, parking garage ramps and loading docks.

The road surface sensor connects to signal conditioning modules for connection to HSE’s line of dataloggers. The signal conditioning modules are DIN rail mountable and can be provided in a mountable enclosure as an option.

The surface sensor measuring elements are molded in a resilient epoxy compound with thermal properties that closely match the roadway surface. It works on thermally passive principles; no artificial heating or cooling is used that may alter the measured environment. The maintenance-free design features corrosive-resistant electrodes to derive the presence of moisture on the roadway surface. The sensors are intentionally designed as low cost units, so replacement is economical when replacement is required due to road surface milling, re-paving, etc.



Temperature Output 0.3 to 1.5 VDC (4 to 20 mA, 0 to 5 VDC optional)
Temperature Range -40° to 140° F (-40° to 60° C)
Temperature Accuracy 0.4° F (0.2° C)
Condition Output 0 to 5 VDC
Voltage Range 9 to 30 VDC
Power Consumption <0.3 Watt
Cable Length 25 ft standard
Sensor Size 3.5 inches Ø x 1 inch height
Operating Temperature -40° to 158° F (-40° to 70° C)

Ordering Guide

Model 5721-01 Surface Sensor Unit; Analog Output (Signal Conditioning Modules, 1
Surface Sensor & Enclosure)
Model 5721-07 Surface & Sub-Surface Sensor Unit; Analog Output (Signal Conditioning
Modules, 2 Surface Sensors & Enclosure)
Model 5721-10 Surface Sensor Unit, Analog Ouput (Signal Conditioning Modules and 1
surface sensors)
Model 5721-51 Surface sensor replacement
Model 5102-00 Additional sensor cable, 5 conductor, 24 AWG (price per foot)




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