Visibility and Present Weather

SWS-200 Visibility & Present Weather Sensor

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The SWS-200 is designed for use in applications where accurate and reliable visibility measurements are required with the addition of WMO 4680 present weather codes.

The sensor measures Meteorological Optical Range (MOR) as well as reporting the presence of liquid and frozen precipitation. Precipitation is reported using WMO table 4680 codes for easy integration with aviation systems. A feature of Biral sensors is the ability to report precipitation intensity according to a range of national standards. The unique backscatter receiver gives the SWS-200 unparalleled abilities in distinguishing frozen from liquid precipitation, a key factor when determining the safety of aircraft operations. Whilst the 10m to 99.99km visibility range makes the sensor suitable of use in meteorological observation networks and research applications.

Analogue voltage and current outputs, complimented by relays that can switch on visibility and/or precipitation, make the sensor suitable for connection to local warning indicators and legacy systems.

An optional interface to the ALS-2 Ambient Light Sensor makes the SWS-200 particularly suited for use in aviation applications where Runway Visual Range (RVR) information is required in addition to METAR data. As standard the sensor is fitted with an extensive self-test capability which includes window contamination monitoring and output compensation.

  • 10m to 99.99km measurement range (other ranges available)
  • Instantaneous and averaged visibility outputs
  • WMO 4680 present weather codes
  • Compact forward scatter design
  • Hood heating for use in extreme environments
  • Window heating and contamination monitoring
  • Serial data output (RS232, RS422 or RS485)
  • Analogue voltage and relay outputs
  • Optional analogue current output
  • Comprehensive self-test capabilities
Measurement Visibility, MOR
Present weather. 14 WMO Table 4680 Codes
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 (6W)
Hood heating power 24 V AC or DC (36W)
Window heating and contamination monitoring Fitted
Operating Temperature -40°C to 60°C
Operating Humidity 0 – 100% RH
Protection rating IP66/IP67
Weight 4.5 kg
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