TriOS OPUS Spectral Sensor

TriOS OPUS is an optical immersion sensor that uses a 256-channel miniature spectrometer (200-360 nm, 0.8 nm/pixel) and a xenon flash lamp to measure COD, BOD, TOC, DOC, nitrate, nitrite and SAC254 at the same time, without reagents. It has an IP68 housing, optical paths from 0.3 mm to 50 mm, stainless steel (1.4571 / 1.4404) or titanium (3.7035) construction, and Ethernet (TCP/IP) and RS-485 (Modbus RTU) communication. 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

Related pages: Nitrate meter · TriOS TriBox controllers · Spectral water quality sensors guide

Multi-parameter spectral online sensor

The OPUS analyzes a wide wavelength band continuously instead of a single wavelength, and it determines organic load and nitrogen compounds in real time, without sampling, sample preparation or reagents. The sensor has turbidity compensation. It calculates these parameters at the same time:

• COD (CODeq): determined by spectral correlation as an indicator of organic load.
• BOD (BODeq).
• TOC (TOCeq) and DOC (DOCeq): carbon-based pollution parameters.
• Nitrate nitrogen (NO3-N) and nitrite nitrogen (NO2-N).
• SAC254: spectral absorption coefficient at 254 nm, an indicator of organic load.
• TSS equivalent (TSSeq): suspended solids through optical attenuation.

Optical paths and measuring ranges

The sensor is configured with the optical path length that fits the pollution level of the process:

Optical path	NO3-N	NO2-N	COD (CODeq)	BOD (BODeq)	TOC / DOC	SAC254
1 mm	0-100 mg/L	0-150 mg/L	0-2200 mg/L	0-2200 mg/L	0-1000 mg/L	0-2200 1/m
10 mm	0-10 mg/L	0-15 mg/L	0-220 mg/L	0-220 mg/L	0-100 mg/L	0-220 1/m

Optical paths of 0.3 mm, 2 mm, 5 mm and 50 mm are also available.

Housing, installation and communication

The housing is made of stainless steel (1.4571 / 1.4404) or titanium (3.7035):

• Pressure: 30 bar with the SubConn underwater connector, 3 bar with a fixed cable and 1 bar in a FlowCell.
• Protection: IP68 and NEMA 6P.
• Optical windows: nano-coated windows to reduce fouling.

The TriOS G2 interface lets the sensor be configured through a standard web browser over Ethernet (TCP/IP). RS-232 or RS-485 (Modbus RTU) connect it to process control systems or external data loggers, and an internal data logger of about 2 GB stores measured values. For all analyzers, see online analyzers.