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Aquamonitrix - Model NOx-monitrix -Nitrite & Nitrate Analyser
The NOx-monitrix from Aquamonitrix® is an advanced real-time analyser for continuous monitoring of nitrate (NO3) and nitrite (NO2) in water and wastewater. Utilizing innovative liquid-phase UV absorbance technology, it delivers highly accurate, interference-free measurements across a wide concentration range. Unlike traditional analysers, NOx-monitrix maintains stable calibration, requires minimal maintenance, and operates without hazardous reagents. Its compact, plug-and-play design allows for easy deployment in treatment plants, industrial effluents, and environmental monitoring applications, enabling cost-effective, high-frequency data collection for precise nutrient management.
Maximum sampling interval: 15 minutes, Analytical Range in freshwater & wastewater*
– Nitrate: 0.6 – 500 mg/L as NO2–
– Nitrite: 0.05 – 100 mg/L as NO3–
*35 ppt saline water, the lower limits of detection are
1.0 mg/L nitrate as NO3– and 0.5 mg/L nitrite as NO2–
- Direct SCADA integration and/or IoT enabled with cloud-based Datamonitrix platform
- Integrated HMI, 4” touch interface Wired output transmission: MODBUS over Serial
- (RS485) as standard (RS232 optional) Optional accessories for conversion of output to Fieldbus, Industrial Ethernet, 4-20 mA
- Data communications via RS232 or Bluetooth, for commissioning/troubleshooting purposes
- Operating temperature range: 7 – 40 °C
- Sample temperature range: 2 – 40°C
- Operating humidity range: 10 – 90% RH, non-condensing
- Storage temperature range: -20 – 60°C
- Storage humidity range: 10 – 90% RH, non-condensing
- IP rating: IP65 (IEC 60529)
Accuracy:
- Fresh water ~99%
- Wastewater & Saline Water ~95%
Precision 95%
Analytical Range for Fresh Water and Wastewater*
- Nitrate: 0.6 – 500 mg/L as NO3–
- (0.14 to 113 mg/L as N)
- Nitrite: 0.05 – 100 mg/L as NO2–
- (0.01 to 30 mg/L as N)
- 15 – 25 Vdc input power, 50 W max. rated power
- Optional external Power Supply available, 85-264 Vac input, 24Vdc output (fully enclosed)
- One Year
C.E. Mark, REACH & ISO14034
The analyser has completed numerous independent trials for accuracy and precision including Environmental Verification Testing to ISO14034 with Scottish Water and the James Hutton Institute. A similar trial was conducted by the Battelle Memorial Institute, in Columbus, Ohio, USA on behalf of the USEPA.
Typical applications include:
- Wastewater treatment plants – Aeration Basin*, De-nitrification, Final Effluent.
- Drinking Water Plants – Inlet protection, Chloramination
- Industrial – Final Effluent
*Measurements within the aeration basin require a sample preparation step such as the SetLR or similar sample preparation device.

