Instrumentación Carreteras y Túneles

SWS-100 Visibility Sensor

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SWS-100 Visibility Sensor


The SWS-100 is optimised for use in applications where accurate and reliable visibility measurements are required alongside basic present weather measurements. The forward scatter measurement principle and unique design ensure the output is both accurate and reliable in all weather conditions and will not be influenced by local lights sources, even those that flash.

The availability of digital, analogue and switching relay outputs provides the flexibility to connect to a wide range of ITS (Intelligent Transport Systems), computer systems or local warning devices.

The unique ability to switch equipment using two fog relays and/or a precipitation relay is a feature of the SWS-100 sensor. For example; you can set the relays to automatically switch a speed reduction sign when the visibility is below 100 meters and then switch an additional ‘danger of aquaplaning’ alert when rains starts.

Full compliance with the visibility measurement requirements of the International Civil Aviation Organisation Runway Visual Range specification and easy integration of the Biral ALS-2 ambient light sensor makes the SWS-100 perfect for use in aviation applications where RVR data is needed.

  • 10m to 99.99km measurement range (other ranges available)
  • Compact forward scatter design
  • Hood heating for use in extreme environments
  • Window heating and contamination monitoring
  • Analogue voltage and relay outputs
  • Optional analogue current output
  • Comprehensive self-test capabilities
  • Serial data output (RS232, RS422 or RS485)


Measurement Visibility, MOR
Present weather (Drizzle, Rain and Snow)
Output RS232, RS422 or RS485
0 – 10 V
4-20mA (optional)
2 Threshold and 1 Fault Relay
Measurement Principle Forward scatter 45°
Measurement Error 5% at 1,500m
Sensor Power 9 – 36 V DC (5.2W)
Hood heating power 24 V AC or DC (24W)
Window heating and contamination monitoring Fitted
Operating Temperature -40°C to 60°C
Operating Humidity 0 – 100% RH
Protection rating IP66/IP67
Weight 4.2 kg
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