• Remote Road Surface Temperature Sensor

Remote Road Surface Temperature Sensor

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The unique DST111 sensor provides a remote alternative to measuring road surface temperature.

By measuring the infrared radiation emitted by the surface and applying intelligent signal processing, DST111 provides a reliable remote surface temperature measurement.

DST111 provides reliable results in conditions where most of the commercially available infrared sensors fail. At night time, when the road surface is cooling under a clear sky, conventional infrared sensors provide an error of up to -3¡C due to emissivity conditions of the road surface. DST111 compensates for this error by its unique design. Installation of DST111 is easy, requiring no slot cutting or closure of the road. Supplied with solar/gsm options, the sensor is ideal for stand-alone operation in remote or in-fill locations and on bridge decks. The sensor is simply installed on a mast, or existing structure beside the road.

DST111 can also be installed alongside an existing Vaisala ROSA Road Weather Station. Together with DSC111, which measures surface state, DST111 forms a versatile stand-alone weather station.

Features and Benefits

  • Remote temperature measurement
  • Unique correction of the error caused by the emissivity of the road surface, negating the need for emissivity adjustment
  • Easy installation and service
  • Low maintenance costs
  • No internal moving parts
  • Stable measurement results even with intense traffic
  • Weather-proof, durable design
  • Reports air temperature and humidity
  • Easy integration with Vaisala ROSA Road Weather Station
  • Capability to act as stand-alone device in remote locations with solar/gsm options
Technical data
Power supply9 ... 30 VDC
Power consumption33 mW
InterfaceDST111Isolated RS-485
DST111RIsolated RS-232
ConnectorM12 (5 pins)
DST111RS-485 and power, male
DST111RRS-232 and power, male
Cables3 m, 10 m, 25 m
One end without connector
0.6 m extension cable to the DSC111
Operating temperature-40 ... +60 ¡C
Operating humidity0 ... 100 %RH
CE CompliantIEC(EN) 61326-1,
For use in industrial locations
VibrationIEC 60068-2-6, level 2g
Measuring distance2 ... 15 m
Measuring areaDiam. 80 cm at 10 m
Installation angle from the horizontal line30 ... 85¡
Fits onto the standard sensor arm DM32ARM (cross-section of 40 mm x 40 mm)
Measuring Range
Resolution0.1 ¡C
Surface temperature-40 ... +60 ¡C
Time constant1 min
Data refresh time30 s
Dimensions (mm)320 x 125 x 100
Weight1.6 kg