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IRS21 Road Surface Sensor

Overview

The IRS21 is a passive sensor embedded in the monitored road surface, flush with the surface, to provide measurements of actual road conditions. It measures surface temperature, water-film level, freezing temperature for NaCl, and road condition (dry, damp, wet, ice or snow, residual salt, freezing). The IRS21 is a primary component of our road-weather information stations (RWIS). Two IRS21 sensors are typically installed at each measurement site.

An SDM-SIO1 or other RS-485 to RS-232 converter is required for communication with Campbell Scientific dataloggers.

 

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Detailed Description

The IRS21 Intelligent Road Surface Sensor is a primary component of our Road Weather Information Stations (RWIS). This passive sensor is typically embedded in the monitored road surface, flush with the surface, to provide measurements of actual road conditions. Two IRS21 sensors are typically installed at each measurement site.

The IRS21 measures the following parameters:

  • Road surface temperature
  • Water film level (up to 4 mm)
  • Freezing temperature for NaCl (others on request)
  • Road condition (dry/damp/wet/ice or snow/residual salt/freezing)


Specifications

Power Requirements 9 to 14 Vdc (less than 200 mA)
Interface RS-485
Road Condition Output dry, damp, wet, snow, freezing wetness, ice
Road Temperature Measurement Range -40º to +70ºC
Road Temperature Accuracy
  • ±0.2ºC (-10º to +10ºC)
  • ±0.5ºC (-40º to +70ºC)
Road Temperature Resolution -0.1ºC
Freezing Point Range -20º to 0ºC (-4º to +32ºF)
Freezing Point Accuracy ±0.1ºC
Freezing Point Resolution -0.1ºC

Compatibility

An SDM-SIO1 or other RS-485 to RS-232 converter is required for communication with Campbell Scientific dataloggers.

Downloads

IRS21 Luftt Road Surface Sensor Epoxy Calculation (75 KB) 10-10-2006

Spreadsheet for calculating epoxy fill needed for road sensor installation