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Sea-Bird Coastal SUNA Optical Nitrate Sensor

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Sea-Bird Coastal SUNA Optical Nitrate Sensor

    • Optional: reduced 5mm pathlength for improved performance during high flow/high turbidity storm events
    • Adaptive sampling logic automatically tunes the optical operations to real-time environmental conditions for high CDOM applications
    • Active fouling control with fully integrated biowiper, ensuring accurate and stable long-term data sets, reducing the need for site visits
    • Advanced processing algorithms, using the full UV spectrum for maximum accuracy across the entire sensing range
    1.1 Mechanical
      SUNA with Wiper
    Material Titanium
    Rated Depth 100 m
    Weight (in air) 5.1 kg
    Pathlength 10 mm or 5 mm
    Length 588 mm/ 583 mm
    Diameter 63 mm
    Temp Range, Operation -2 – 35 C
    Temp Range, Storage -20 – 50 C

    1.2 Electrical

    Input 8 – 18 VDC
    Input, Sensor with Wiper 8 – 15 VDC
    Current Draw, Operation ~ 625 mA at 12V
    Current Draw, Standby ~ 20 mA at 12V
    Light Source UV Deuterium Lamp (900 hr lifetime)
    Communication Interface RS232; Analog 4 – 20 mA; (USB, SDI-12 optional)
    Data Storage 2GB (optional)

    1.3 Optical

    Spectral Range 190-370 nm
    Pathlength 10 mm (5 mm optional)

    1.4 Analytical

    1.4.1 Nitrate Measurement Accuracy

    Concentration        Range 10 mm 5 mm
      Sensor Specific Class Based Sensor Specific Class Based
    up to 14 mg N/L 0.028 mg N/L or 10% 0.035 mg N/L or 20% 0.056 mg N/L or 10% 0.063 mg N/L or 20%
    up to 28 mg N/L 0.028 mg N/L or 15% 0.035 mg N/L or 25% 0.056 mg N/L or 15% 0.063 mg N/L or 25%
    up to 42 mg N/L 0.028 mg N/L or 20% 0.035 mg N/L or 30% 0.056 mg N/L or 15% 0.063 mg N/L or 25%
    up to 56 mg N/L out of range 0.056 mg N/L or 15% 0.063 mg N/L or 25%

    * A sensor specific calibration uses extinction coefficients from the sensor itself

    * A class based calibration uses extinction coefficients that are the averager of many sensors

    1.4.2 Nitrate Measurement Precision

    Processing Configuration Seawater or Freshwater with T-S Correction Seawater (0-40PSU)
    Short-term precision (3 sigma) 0.004 mg N/L 0.034 mg N/L
    Change (“drift”) per hr of lamp time <0.004 mg N/L <0.014 mg N/L

    1.4.3 Limit of Detection and Limit of Quantification

    Processing Configuration Seawater or Freshwater with T-S Correction Seawater (0-40 PSU)
    Limit of Detection 0.004 mg N/L 0.034 mg N/L
    Limit of Quantification 0.014 mg N/L 0.112 mg N/L

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