EXO NitraLED UV Nitrate Sensor

This sensor must be installed into an EXO Sonde to function. Does not function on its own.

EXO NitraLED UV Nitrate Sensor for Freshwater Environments

EXO NitraLED Sensor includes only the sensor for use in EXO1 sampling applications.



Nitrate Monitoring, Enlightened.

Utilizing state-of-the-art UV LED technology, EXO NitraLED™ is an optical nitrate sensor designed for long-term, low-drift monitoring. Built-in corrections for Natural Organic Matter (NOM) and Turbidity minimize interference in freshwater environments. Its compact form factor allows for seamless integration with any EXO Sonde.

Expand and enhance your water quality monitoring program with UV Nitrate for more informed decision making.

The world’s most accessible monitoring solution for nitrate, at a fraction of the cost of lamp-based monitors.

Fits in the palm of your hand—and integrates directly into any EXO Sonde. No external hardware required!

Nitrate Sensor

Learn more about EXO NitraLED

Compact and Accurate
The EXO platform offers a completely new approach – highly accurate, quick-response sensors in a small, easy-to-deploy and easy-to-maintain package. Gone are large and complicated sensor arrangements requiring complex integration.

Smart Probes
All EXO sensors have onboard memory and processing, allowing users to easily calibrate and configure sensors at one location and distribute to various field sites. Smart sensors are auto-recognized from any port of an EXO sonde making sensor payloads interchangeable and completely customizable.

Smart Ports
Wet-mateable connectors allow for swaps in wet conditions, while the smart ports shut down any excessive current draws to prevent damage.

Designed for Use with EXO Multiparameter Sondes
• EXO1 sonde has 4 ports and a smaller diameter
• EXO2 sonde has 7 ports for the ultimate monitoring platform
• EXO3 sonde has 5 ports for a lower cost option using the central wiper
• EXO2s sonde offers the same features as the EXO2, but without the battery compartment


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)

Depth Rating 250 m
Dimensions Length: 21.3 cm; Diameter: 1.5 cm; Weight: 0.07 kg
Drift / Stability ≤ 0.2 mg/L–N
Equipment used with EXO™
Light Source UV LED (x2)
Lower Detection Limit 0.005 mg/L–N
Measurement Range 0-10 mg/L–N
Medium Fresh water
Nominal Wavelengths 235 nm, 275 nm
Operating Temperature 5-35°C
Pathlength 10 mm
Precision ≤ 2% Coefficient of Variation (CV)
Response Time T95 < 30 seconds
Sensor Optical, absorbance
Storage Temperature -20-80 °C
Unit of Measure NO3-N (Nitrate-N) in mg/L
Warranty 2 years