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Stand: 1147
Unit 8 Harbour Road Trading Estate
United Kingdom
BS20 7BL

T: + 44 01275 847787

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Company profile

Biral specialises in the design, manufacture and supply of meteorological sensors for industrial, environmental and research applications. Our VPF and SWS Visibility and Present Weather sensors provide outstanding levels of accuracy and performance. Their unmatched reliability and durability is reflected in their extensive use in critical applications such as marine navigational aids, wind energy, roadside fog warning and airport RVR/METAR systems. The Biral BTD Thunderstorm detector series, with its unique quasi-electrostatic operating principle demonstrates our commitment to developing quality products to solve customer measurement needs.

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Visibility and Present Weather Sensor – SWS-200
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. Whilst the 10m to 75km 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.
Visibility and Present Weather Sensor – VPF-750
The VPF-750 Visibility and Present Weather sensor is the most advanced in Biral’s product range. The sensor is designed for use in aviation applications where extended weather information, including past weather, is required for inclusion in METAR reports. The sensor is also well suited to research applications and use in meteorological observation networks. The unique backscatter receiver combined with accurate external temperature, humidity and precipitation sensors gives the VPF-750 unparalleled abilities in distinguishing frozen from liquid precipitation, with the added advantage of identifying freezing precipitation. The sensor reports both WMO table 4680 and METAR codes to simplify integration in to host systems. A wealth of other data is provided including a transmissometer equivalent EXCO. An optional interface to the ALS-2 Ambient Light Sensor simplifies use in aviation applications where both Runway Visual Range (RVR) and METAR information is required.
Ambient Light Sensor ALS-2
The ALS-2 Ambient Light Sensor is designed to measure background luminance as part of a Runway Visual Range (RVR) system. Mounted alongside the runway the ambient light sensor is often deployed with a visibility meter to provide the data necessary for calculation of RVR. Designed to comply with specifications and guidelines produced by the International Civil Aviation Organisation (ICAO), World Meteorological Organisation (WMO) and the Federal Aviation Administration in the USA (FAA), the ALS-2 meets all the requirements for use in typical RVR systems. The ability to connect the sensor directly to a Biral visibility or present weather sensor and have the background luminance data incorporated into the visibility sensors data string simplifies system design and construction. • 2 to 40,000 Cdm-2 measurement range • Choice of serial digital or analogue outputs • Simple and quick in field calibration • Extensive self-test capabilities • -60°C to 70°C operating range
Thunderstorm Detector – BTD-300
The BTD-300 Thunderstorm Detector is a standalone sensor that reliably detects the presence of all forms of lightning to a range of 83 km. The unique quasi electrostatic operating principle gives the detector a very low false alarm rate and the ability to warn of the risk of overhead lightning. The ability to reliably detect and range cloud-to-cloud lightning, which is typically much more common than cloud-to-ground strikes, makes the BTD-300 much more sensitive to the presence of storms compared to devices that rely on radio detection. The electrostatic operating principle allows the sensor to warn of the risk of overhead lightning before the first discharge occurs. Virtually maintenance free in operation, the BTD-300 can either interface directly to an integrated system or be operated using the supplied PC compatible display and logging software. The optional warning relay module allows the sensor to automatically sound alarms whenever a storm approaches.
Thunderstorm Detector – BTD-350 – NEW!
The BTD-350 Marine Thunderstorm Detector has been designed specifically for use in the marine environment. Its structure has been strengthened to withstand the rigours aboard large vessels with all surfaces coated with a marine grade painting system. The BTD-350 reliably detects the presence of all forms of lightning, out to a range of 83km. The unique quasi-electrostatic operating principle gives the detector a very low false alarm rate and the unique ability to warn of the risk of overhead lightning, even before the lightning has started. Virtually maintenance free, the BTD-350 can operate with the supplied PC display software, seamlessly integrate into sophisticated weather monitoring systems or directly activate local warning lights or sounders.


  • Visibility
  • Present Weather
  • Ambient Light
  • Lightning
  • Weather


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