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Optical nitrate sensor

WTW sensors - optical nitrate sensor UV 700 IQ Nox

UV 700 IQ NOx: Low-cost probe with integrated ultrasonic cleaning for the maintenance-free and reagent-free measurement of nitrate

  • No replacement of seals or wiper profiles
  • Minimal effort thanks to maintenance-free WTW ultrasonic cleaning
  • No danger of emerging water thanks to completely sealed housing
  • No corrosion thanks to titanium housing

With the new sensor UV 700 IQ NOx, nitrate is detected via a UV absorption measurement at a wavelength below 250 nm. Turbidity influences are effectively compensated by a reference measurement. This cost-effective probe is especially suited to regulate or control intermittent aeration. Another field of application is the detection of nitrate in rivers.


Model Description Order no.
In wastewater and surface waters, with turbidity compensation and integrated ultrasonic cleaning. Delivery scope includes multifunctional slide and shock-absorption-rings, without connecting cable (order SACIQ separately).
UV 701 IQ NOx Optical nitrate (NOx) sensor to measure higher concentration 481034
UV 705 IQ NOx Optical nitrate (NOx) sensor to measure low concentrations 481035

Technical Data

Model UV 701 IQ NOx UV 705 IQ NOx
Measuring range 0.0 - 100.0 mg/l NO2+3-N 0.0 - 20.0 mg/l NO2+3-N
Resolution 0.1 mg/l NO2+3-N 0.1 mg/l NO2+3-N
Measuring method UV absorption measurement UV absorption measurement
Compensation Turbidity compensation Turbidity compensation
Cleaning WTW ultrasonic cleaning WTW ultrasonic cleaning
Material Housing: Titanium PEEK
Measuring window: Saphire glass
Housing: Titanium PEEK
Measuring window: Saphire glass
IQ Sensor Net system 282/284 and 2020 282/284 and 2020


Model Description Order no.
DIQ/CHV Dual IQ/Cleaning Head Valve for system 282/284 472007
MIQ/CHV PLUS Modules IQ/Cleaning Head Valve for system 2020 480018
Cleaning Air Box - 115 VAC Air pressure compressor, 115 VAC 480017
Cleaning Air Box - 230 VAC Air pressure compressor, 230 VAC 480019
VIS FT-1 Flow measuring cell for the operation with automatic compressed air cleaning 480080
VIS FT-1/RS Spare parts set for VIS FT-1 480081
VIS Set Brushes/1mm 2 cleaning brushes for gap width 1 mm 481031
VIS Set Brushes/5mm 2 cleaning brushes for gap width 5 mm 481032
VIS/CT Cleaning cards 481071
VIS/CV Multifunctional slide 481074
SET/AP Air pressure cleaning set: 15 m compressed air hose including fittings 481075
VIS/CS Cleaning set 481079


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