• Drinking water
  • Process optimisation of wastewater treatment plants
  • Industrial and municipal wastewater
  • Mineral water monitoring
  • Surface water
Nitrates, nitrites, NO<sub>2+3</sub>


Spectrophotometric analyzer for the determination of the nitrate ion in water. The UVNO3 analyzer rely on the measuring principle of UV light absorption of the chromophores NO3-/NO2-. The measurement is the weighted sum of the nitrate and nitrite concentration. As the concentration of NO3- or NO2- increases, UV absorption also increases. In many most applications the NO2- concentration is negligible and this is reason why it's usually considered NO3- measurement. Results are reported on the touchscreen display in mg/L or ppm of NO3 , NO2+3 , NO3-N or NO2+3-N. The measuring, calibration and cleaning frequency can be programmed by the user.
Nitrates are dangerous pollutants for aquatic life and poses risks to human health when present in drinking water. The nitrates concentration in surface waters derive mainly from biological pollution due to urban agglomerations, agriculture nitrogenous fertilizers, discharges from chemical industries and combustion processes. The instrument is ideal for potable water or suface water analysis and with the addition of a dilution module is also capable of the determination of nitrates in complex matrices such as urban and industrial wastewaters.


The method is based on the absorbance that the nitrate ion in water sample presents in the UV region at 220 nm . Considering that also organic substances absorb in that spectrum region, a reference absorption measurement at 270 nm is required, in order to reduce the organic interference. The compensated absorbance is proportional to the nitrate ions concentration in the sample.

Technical Specifications

Model UV
Sampling Mode Batch, with freely settable frequency.
Sample Pressure: Atmospheric
Temperature: 5 ‐ 45°C (41 ‐ 113°F)
Flow Rate: 80 to 500 mL/min
Connection: 6 mm (¼-in.)
Drain Pressure-free drain
Connection: 12 mm (½-in.)
Input Streams 2
Cabinet Material Cold-rolled steel painted with epoxy powder
Dimensions (H x W x D) 606 x 380 x 209 mm (23.6 x 14.8 x 8.2 in)
Weight 20 kg (44 lbs)
Power Supply Input Voltage:115 - 240 VAC 50/60 Hz standard or 24 VDC (option)
Power consumption: max. 80 W
Output signals 2 x 4-20 mA analog outputs
Modbus RTU via RS485
Alarms 4 SPDT programmable voltage-free relays
Digital Input Online
Ambient Temperature 5 - 45 °C (41 - 113 °F)
Ambient Humidity 10 to 90 % RH (indoor use only, outdoor installation possible with protective cabinet or shelter not included)
Protection Grade IP54


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