Serinus® 50

Sulfur Dioxide (SO2) Analyser

Today the increased fossil fuel combustion at power plants and other industrial facilities has led to higher concentrations of SO2 emissions. The Serinus® 50 sulfur dioxide (SO2) uses proven pulsed UV fluorescent radiation technology to measure SO2 in ambient air (LDL < 0.3 ppb, range 0 to 20 ppm). Delivering a steady stream of precise and reliable data, it is empowering governments and organisations to reduce their greenhouse footprint, while complying with global regulations


Real-time monitoring every minute
Comprehensive data logging and remote viewing of over 200 operational parameters.
Remote application dashboard
Bluetooth connectivity combined with the ‘Serinus® Remote’ Android App for simpler programming, viewing, downloading and emailing of data.
Long-life data storage
Removable flash memory stores ~10 years of data, including up to 12 individual parameters and event logs.
Intuitive interface
Advanced GUI and a large alphanumeric keypad with tactile keys.
Ergonomic design
Rack slide design for easy access to internal components and analyser removal from a rack cabinet.
Low power demand
Reduced AQMS power usage due to the instrument’s low power demand and ability to operate over a wide temperature range.

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Pulsed UV fluorescent radiation technology

The measurement of Sulfur Dioxide is based on classical fluorescence spectroscopy principles. SO2 exhibits a strong ultraviolet (UV) absorption spectrum between 200 to 240 nm. When SO2 absorbs UV at this wavelength, photon emission occurs (300 to 420 nm). The amount of fluorescence emitted is directly proportional to the SO2 concentration. The Serinus 50 follows these principles and measurement techniques: 

  • Sample air is passed through a hydrocarbon kicker which removes hydrocarbons (a common interferent). 
  • UV energy from a zinc discharge lamp is passed through a UV band pass filter to produce radiation at 214 nm. 
  • The radiation is focused into the fluorescence cell where it is absorbed by the SO2 molecules. 
  • The SO2 molecules emit photons (fluoresce) uniformly in all directions. 
  • Wavelengths between 310-350 nm, which are specific to SO2, pass through a band pass filter where they reach the photomultiplier tube which measures the signal intensity. 
  • A reference detector monitors the emission from the zinc lamp and is used to correct for fluctuations in lamp intensity.

Approved globally

  • US EPA approval (RFNA–0809–186)
  • EN approval TÜV (0000040205-02)
  • Australian Standard (AS 3580.5.1-2011)
  • Russian approval (56263-14)
  • French approval LSCQA
  • Ukraine approval (12/3/B/24/295-17)
  • Chinese Pattern Approval (JJF1361-2012)
  • Korean approval NIER (AACMS-2017-04)

Superior air quality monitoring for global environments

Air quality monitoring is increasingly important in today’s urban, industrial and rural areas. The Serinus® range of analysers has emerged through 40+ years of experience and knowledge gained from operating large air quality monitoring networks. The result is a superior portfolio of instruments that integrate seamlessly into continuous monitoring networks. They not only measure human exposure to pollutants but can be combined with trace/background monitoring as well as stack monitoring – thus becoming a vital tool for governments and organisations to track and abate air pollution and its effects on their immediate environment.

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