TriOS OPUS aero Spectral Sensor

TriOS OPUS aero is a compact optical spectral sensor for the measurement of nitrate and nitrite in wastewater aeration tanks. Its light source is a xenon flash lamp, and a 256-channel miniature spectrometer analyzes the full spectrum from 200 to 360 nm. Depending on the calibration, it reads either nitrate nitrogen (NO3-N) only, or nitrate plus nitrite nitrogen (NO3-N + NO2-N). Power consumption is at most 8 W. Mikron Proses (Üsküdar, Istanbul), TriOS’s solution partner in Turkey, provides application consulting on sensor selection, commissioning and calibration.

Application consulting · Commissioning · Calibration → Send us your requirement

Spectral analysis

OPUS aero measures without sampling, sample preparation or reagents. The sensor provides:

• Nitrate (NO3-N): read alone or together with nitrite, depending on the calibration.
• Nitrite (NO2-N): measured with the nitrate plus nitrite calibration.
• Turbidity compensation: applied automatically.

OPUS aero does not output COD, BOD, TOC, DOC or SAC254. For those parameters, see the TriOS NICO plus UV photometer and the TriOS OPUS spectral sensor.

Compact housing and measuring time

The stainless steel (1.4571 / 1.4404) housing is about 470 mm long and weighs about 3 kg.

• Measuring time: T100 response time is 2 minutes and the measuring interval is at least 1 minute.
• Optical paths: 0.3 mm, 1 mm and 2 mm are available. The shorter the path, the higher the measuring range (0.3 mm: NO3-N 2.4-120 mg/L; 2 mm: NO3-N 0.35-18 mg/L).
• Windows: the optical window is nano-coated, and typical maintenance is at most 0.5 hours per month.

Digital integration and data

The sensor is configured through a web browser with the TriOS G2 interface, and connects to process control systems and external data loggers through Ethernet (TCP/IP) or RS-232 / RS-485 (Modbus RTU). An internal data logger of about 2 GB stores measured values. For the measuring principle, see the nitrate sensor guide; for all analyzers, see online analyzers.