Nitrate Sensor
TriOS NICO®
Most affordable nitrate monitoring unit. Low-cost UV photometer for online NO₃ measurement in lakes, rivers, drinking water, and wastewater. Xenon flash lamp source.
Full specifications →Nitrate Probes
UV photometric nitrate sensors for lakes, rivers, drinking water, and wastewater
Not sure which probe is right for you?
Use our interactive Nitrate Probe Configurator — select your water type, parameters, path length, housing, and accessories to get a complete part number list you can print or submit directly to us.
Spectral Sensor
TriOS OPUS®
Full UV spectrum sensor (0.8 nm/pixel). Measures NO₃-N, NO₂-N, COD, BOD, DOC, TOC, and more. G2 interface with web browser configuration. WiFi & Ethernet connectivity.
Full specifications →
Accessories
NICO/OPUS Accessories
G2 interface, G2plus, G2 air interface, SDI-12 converter, Wiper W55, wiper blades, bulkhead, custom Trios cables, FlowCell, ValTub, TriBox 3, TriBox Mini.
Selection Guide
NICO vs. OPUS — Which is right for you?
| Feature | NICO® | OPUS® |
|---|---|---|
| Technology | UV photometer (4 photodiodes) | Full UV spectrum (0.8 nm/pixel) |
| Parameters | NO3-N, NO3, NOx-N, NOx | NO3, NO2, COD, BOD, DOC, TOC, TSS, and more |
| Light Source | Xenon flash lamp | Deuterium lamp |
| Connectivity | Ethernet, RS-485 Modbus RTU | Ethernet, RS-485, WiFi (optional) |
| Best For | Cost-effective single-parameter nitrate | Multi-parameter N & C monitoring |