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Ambient Light Sensor – ALS-2

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Ambient Light Sensor – ALS-2

    Provides an accurate and reliable determination of the amount of background light during all weather conditions.
    • Designed to Federal Aviation Authority (FAA) requirements
    • Built to existing Biral HSS and SWS design standards.
    • Optical response to mimic a human observer
    • Standalone or integrated to Biral HSS or SWS sensors
    • Digital and/or Analogue outputs
    • Extensive self-checking
    • Field calibration can be carried out without additional calibrator

    Dynamic range 2-40,000 Cdm-2 (0.5-11,700 fL)
    • Resolution
    Digital O/P: 2 Cdm-2 Analogue O/Ps: 2 Cdm-2 for low mode (2 – 4,000 Cdm-2) 10 Cdm-2 for high mode (10 – 40,000 Cdm-2)
    Measurement accuracy <10% of value
    • Field of view
    • Spectral response
    Wavelength sensitivity range 420-675 nm, peak 565 nm Analogous to CIE luminous spectral efficiency.
    Window contamination monitoring Yes
    • Window hood and enclosure heaters
    Window heater is standard, but may be disabled Hood heaters is optional Enclosure heater is optional
    In-field calibration capability Yes
    • Automatic self-checking
    Yes
    • Interfacing
    Sensor can operate either standalone or integrated with Biral HSS and SWSvisibility and present weather sensors
    Output connections Digital: RS232, or RS422, or RS485 Analogue : Two outputs – Low Mode 0 – 4,000 Cdm-2 (0 – 10V) High Mode 10 – 40,000 Cdm-2 (0 – 10V)
    • Operating environment
    -40°C (-55°C with optional internal heater) to +70°C 0 to 100% (condensing) relative humidity
    Enclosure rating IP66 (water and dust tight), corrosion resistant
    • Power
    9-36 VDC for sensor and window heater, 24-28V AC or DC for hood and internal heaters. Can draw power directly from Biral HSS or SWS sensor

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