Opsis System 400

CEMS ambient air monitors

The Opsis CEM system utilises proven non-contact, open-path, differential optical absorption spectroscopy (DOAS) measurement technology in both the UV and IR range to provide an economic, fast, low-maintenance, internationally approved multi-parameter continuous emission monitoring solution. The brain of every Opsis CEM System 400 is at least one Opsis AR600 series analyser.

Acoem Australasia (Ecotech Pty Ltd) is an official representative and distributor of Opsis products in Australia and New Zealand.


Multi-component, multi-path system
In-situ cross-stack measurements
Fast response time
With high sensitivity and accuracy allows for real-time data availability
No sample extraction removes heavy maintenance requirements and possibilities for chemical change in the substances measured
Logic outputs
Provides logic outputs for real-time information to play a wider part in plant control and efficiency
Comprehensive data logging
Logs information from any other devices producing continuous outputs – such as flow and temperature sensors
Worldwide support
Supported internationally by a worldwide network of representatives

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One system, three solutions

The Opsis System 400 is available in the following configurations as standard:

  • 400BASIC: Basic system calibrated for SO2, NO & NO2
  • 400EXT: Extended system calibrated for SO2, NO, NO2, CO & H2O
  • 400WASTE: Extended system for waste to energy plants, calibrated for SO2, NO, NO2, CO, HCl & H2O.

Most importantly, an Opsis CEM system can be fully customised to suit your measurement requirements and can be installed as in-situ (System 400 CS), hot wet extractive (System 400 HWE), or fast-loop configuration (System 400 FL) integrated system.



With hundreds of systems operating around the world in a very wide range of applications, the Opsis CEM system offers its customers proven solutions for virtually any monitoring requirement.

Continuous Emissions Monitoring System

Opsis ambient air quality & Continuous Emission monitoring systems utilise Differential Optical Absorption Spectroscopy (DOAS) in accordance with Beer Lambert’s Law to measure a wide range of gaseous parameters in the UV and IR wavelength. These analysers utilise differential optical absorption spectroscopy (DOAS) in accordance with Beer Lambert’s Law to measure a wide range of gaseous parameters in the UV and IR wavelength.

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