Based on the device platform concept of TriOS sensors like OPUS, LISA and VIPER, TriOS introduces NICO: a low-cost UV photometer for the determination of nitrate. The four detection channels enable a pre­cise optical determination of nitrate by absorption, taking into account turbidity and organic substances that pose a problem for many products currently on the market.

An internal temperature correction additionally increases stability of the measured values.

Equipped with our G2 interface with web browser configuration and internal data logger NICO includes features that are much more advanced than those of comparable devices available on the market.

The unified platform of all TriOS photometers also facilitates a standardized spare parts and consumables system, which allows the use of a wide range of accessories for our devices. Furthermore the cutting-edge G2 interface enables quick integration into third-party systems.

Technical specifications


Measurement technology light source: Xenon flash lamp; detector: 4 photo diodes + filter
Measurement principle Attenuation
Optical path 0.3 mm, 1 mm, 2 mm, 5 mm, 10 mm, 50 mm
Parameters NO3-N, NO3, NOx-N, NOx (calibrated with NO3 standard solution)
Measurement range 1 mm path 0.5…60 mg/L NO3-N; 10 mm path 0.05…6 mg/L NO3-N
Measurement accuracy ± (5 % + 0.1 mg/L NO3-N) with 10 mm path
± (5 % + 1 mg/L NO3-N) with 1 mm path
Turbidity compensation Yes
Data Logger ~ 2 GB
Reaction time T100 20 s
Measurement interval ≥ 10 s
Housing material Stainless steel (1.4571/1.4404)

titanium (3.7035)

Dimensions (L x Ø) ~ 470 mm x 48 mm (10 mm path)
Weight stainless steel ~ 3 kg

titanium ~ 2 kg

Interface, digital Ethernet (TCP/IP)
RS-485 (Modbus RTU)
Power consumption  ≤ 7 W
Power supply 12…24 VDC (± 10 %)
Required supervision Typically ≤ 0.5 h/month
Calibration/maintenance interval 24 months
System compatibility Modbus RTU
Warranty 1 year (EU & US: 2 years)


Max. pressure with Subconn 30 bar; with fixed cable 3 bar; in flow unit 1 bar, 2…4 L/min
Protection type IP68
Sample temperature +2…+40 °C
Ambient temperature +2…+40 °C
Storage temperature -20…+80 °C
Inflow velocity 0.1…10 m/s