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Observator 100 years

YSI EXO NitraLED UV Nitrate Sensor

YSI EXO NitraLED is the world’s most accessible UV Nitrate sensor, built with state-of-the-art LED technology, for long-term nutrient monitoring. With seamless integration into any EXO Sonde, this sensor simplifies and reduces the cost of unattended nitrate monitoring for point and non-point source pollution in freshwater environments.


Dutch market only
Please be informed that we – as a reseller – are only allowed to sell/deliver Xylem/YSI and Xylem/SonTek products to the Dutch market.



  • Dimensions:
    • Length 21.3 cm
    • Diameter 1.5 cm
    • Weight 0.07 kg
  • Units measured: NO3-N (Nitrate-N) in mg/L
  • Sensor type: optical, absorbance
  • Light source: UV LED (x2)
  • Nominal wavelengths: 235 nm, 275 nm
  • Pathlength: 10 mm
  • Measurement range: 0-10 mg/L–N
  • Lower detection limit: 0.005 mg/L–N
  • Accuracy:
    • ± 0.1 mg/L–N or 5% of reading, w.i.g. (within 2°C)
    • ± 0.4 mg/L–N or 5% of reading, w.i.g. (full temp range)
  • Response time: T95 < 30 seconds
  • Drift / stability: ≤ 0.2 mg/L–N
  • Repeatability / Precision: ≤ 2% Coefficient of Variation (CV)

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