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Ambient Air Quality Monitoring Systems

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Schematic of Extractive Ambient Air Quality Monitoring System
Schematic of In-Situ Ambient Air Quality Monitoring System


Extractive Ambient Air Quality
Monitoring System


In-Situ Ambient Air Quality
Monitoring System


Primary Benefits of Extractive Systems:

  • Conducts measurements in a point
  • Gas analyzers, dust meters, which are used in the system, are specially designed to control only one specific component resulting in balanced technical characteristics i.e. sensitivity, accuracy, interference to other components etc. are as a rule in compliance with the national requirements for ambient air control
  • Calibration is conducted in a conventional way with the help of gases in cylinders (approved worldwide for the most gases) or gas generators (approved in some countries)
  • The system is located in a pavilion or in a room in a building and includes a block of functioning control
  • The system is more safe
  • The system can be readily expanded. Other gas analysers or dust meters can be added more cost effective

Primary Benefits of In-Situ Systems:

  • Conducts measurements on path
  • Measurements on path (integral evaluation of air pollution) are considered more representative for evaluation of average air pollution levels of cities, industrial areas etc.
  • Only one multi-components optical gas analyzer is used in a system as a rule, which is more convenient and less expensive in a maintenance
  • Calibration is conducted in a special way with the help of special standards. It is adopted that the ambient concentration of a pollutant over the monitoring path would be equivalent to a much higher concentration of the pollutant contained in a short calibration cell inserted into the optical beam of an open path analyzer during a precision test or accuracy audit. So running-gas or sealed short gas cells or compliant internal calibration standarts can be used
  • No need of any pavilion or a room for the system location as a rule

Primary Limitations of Extractive Systems:

  • Requires sampling with a sample contact. Change of concentration of studied species in a sample is possible because of cross-reaction of components and/or adsorption
  • Requires calibration by gases in cylinders or by gas generators as well as requires manifolds, pumps, manometers, valves, control and test equipment for conducting frequent periodic system calibration
  • Slower response due to sample transit time
  • Generally more expensive especially in exploitation

Primary Limitations of In-Situ Systems:

  • Not so many components are approved to be controlled for an official presentation
  • Hard weather conditions can influence on result and/or duration of measurements
  • Influence of interfering components on result of measurement is generally stronger for multi-components gas analyzers - In-Situ analyzers in our case

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