Sea-Bird Scientific SUNA Optical Nitrate Sensor
High accuracy in-situ nitrate measurement
With improved optics and built-in adaptive sampling intelligence, the SUNA V2 measures nitrate with industry-leading accuracy and stability over a wide range of environmental conditions. The wide range of optional features offered for the SUNA V2 make the sensor a cost-effective choice for routine nitrate measurements.
- Attended, Unattended
- Nitrate
- High-accuracy, chemical-free, in-situ nitrate measurement
- SDI-12, RS-232
- 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
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| Mechanical | SUNA with Wiper |
| Material | Titanium |
| Rated Depth | 100 m |
| Weight (in air) | 4.8 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 |
| 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) |
| Optical | |
| Spectral Range | 190-370 nm |
| Pathlength | 10 mm (5 mm optional) |
| Nitrate Measurement Accuracy | |
| Concentration Range | 10 mm pathlength |
| Calibration | Sensor Specific* |
| up to 14 mg N/L | 0.028 mg N/L or 10% |
| up to 28 mg N/L | 0.028 mg N/L or 15% |
| up to 42 mg N/L | 0.028 mg N/L or 20% |
| up to 56 mg N/L | out of range |
| Calibration | Class Based** |
| up to 14 mg N/L | 0.035 mg N/L or 20% |
| up to 28 mg N/L | 0.035 mg N/L or 25% |
| up to 42 mg N/L | 0.035 mg N/L or 30% |
| up to 56 mg N/L | out of range |
| Concentration Range | 5 mm pathlenght |
| Calibration | Sensor Specific* |
| up to 14 mg N/L | 0.056 mg N/L or 10% |
| up to 28 mg N/L | 0.056 mg N/L or 15% |
| up to 42 mg N/L | 0.056 mg N/L or 15% |
| up to 56 mg N/L | 0.056 mg N/L or 15% |
| Calibration | Class Based** |
| up to 14 mg N/L | 0.063 mg N/L or 20% |
| up to 28 mg N/L | 0.063 mg N/L or 25% |
| up to 42 mg N/L | 0.063 mg N/L or 25% |
| up to 56 mg N/L | 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 | |
| Nitrate Measurement Precision | |
| Processing Configuration | Seawater or Freshwater with T-S Correction |
| Short-term precision (3 sigma) | 0.004 mg N/L |
| Change ("drift") per hr of lamp time | <0.004 mg N/L |
| Processing Configuration | Seawater (0-40PSU) |
| Short-term precision (3 sigma) | 0.034 mg N/L |
| Change ("drift") per hr of lamp time | <0.014 mg N/L |
| Limit of Detection and Limit of Quantification | |
| Processing Configuration | Seawater or Freshwater with T-S Correction |
| Limit of Detection | 0.004 mg N/L |
| Limit of Quantification | 0.014 mg N/L |
| Processing Configuration | Seawater (0-40 PSU) |
| Limit of Detection | 0.034 mg N/L |
| Limit of Quantification | 0.112 mg N/L |