The new SUNA V2 UV nitrate sensor is the ultimate chemical-free solution for autonomous monitoring of nitrogen-based nutrient concentrations in ocean, estuarine and high turbidity freshwater environments. The SUNA V2 (Submersible Ultraviolet Nitrate Analyzer) is a chemical-free UV nitrate sensor based on the ISUS (In Situ Ultraviolet Spectroscopy) UV nitrate measurement technology developed at MBARI. […]
The new SUNA V2 UV nitrate sensor is the ultimate chemical-free solution for autonomous monitoring of nitrogen-based nutrient concentrations in ocean, estuarine and high turbidity freshwater environments.
The SUNA V2 (Submersible Ultraviolet Nitrate Analyzer) is a chemical-free UV nitrate sensor based on the ISUS (In Situ Ultraviolet Spectroscopy) UV nitrate measurement technology developed at MBARI. Satlantic has adapted the technology to develop the SUNA V2 to measure nitrate in increasingly more challenging environments including extremely turbid and high CDOM conditions. With improved optics and built-in logic intelligence, the SUNA V2 measures nitrate with industry leading accuracy and stability over a wide range of environmental conditions, from blue-ocean nitraclines to storm runoff in rivers and streams.
Limit of Detection |
0.5 μM (FW or SW with T/S correction)
2.0 μM (SW 0-40 psu)
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Detection Range |
3000 μM (10 mm path length)
4000 μM (5 mm path length)
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Accuracy |
± 2 μM (± 0.028 mg/I-N) or ± 10% of reading |
Short-term precision (at 3σ) |
0.3& μM (FW or SW with T/S correction)
2.4 μM (SW 0-40 psu)
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Drift (per hour lamp time) |
0.3 µM (FW or SW with T/S correction)
1.0 µM (SW 0-40 psu)
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Turbidity range
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625 NTU* (10 mm path length; absent other absorbing species)
1250 NTU (5 mm path length; absent other absorbing species)
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*Nephelometric Turbidity Units
Path Length | 10 mm & 5 mm (high turbidity option) |
Wavelength Range | 190-370 nm |
Lamp Type | Continuous Wave, Deuterium Lamp |
Lamp Lifetime | 900 h |
Input Voltage | 8-18 VDC & 8-15 with Hydro-Wiper |
Power Consumption | 7.5 W (0.625 A at 12 V) nominal |
Material | Acetal/ Titanium |
Depth Rating |
500 m
100 m with Hydro-Wiper
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Weight |
2.5 kg
3.1 kg with Hydro-Wiper
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Displacement |
1749 cm3
2092 cm3 with Hydro-Wiper
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Methods |
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Correction |
Real-Time temperature-salinity correction available* (0-35o C, 0-40 PSU) * Requires external T/S data. |