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GA-21plus Portable Flue Gas Analyzer

Fitted With Up to Six Electrochemical, Two IR, One Thermal Conductivity, One PID Sensor

Madur logo

Compliant to EN 50379 and EN 50270

 GA 21 Plus with 4 20mA outputs

Optional 4-20mA outputs are possible 

Main features

  • Available in soft or hard case
  • Equipped with up to 7 electrochemical cells
  • Equipped with up to 2 NDIR sensors
  • Built-in 58mm ribbon graphic printer
  • Built-in rechargeable battery for up to 7 hours of operating
  • Peltier “miniDryer” with a peristaltic pump for condensate removal (optional)
  • Probe holder with a standard M30x1 fitting, fits all madur gas probes with the K-type thermocouples
  • Gas filter with condensate trap and replaceable insert
  • Differential pressure sensor - for measurements of chimney draft and flow velocity (with help of Pitot tube)
  • Soot measurement program
  • Measurements of gas and ambient temperatures
  • 2 additional inputs for extra temperature sensors
  • Analogue outputs (0/4-20mA or 0-10V) - optional
  • Built-in large memory for results, two formats of data savings
  • Calculations of many additional parameters
  • Firmware for gas calibrations


Soft vs hard casing

GA 21 Cases

Complete and ready to operate GA-21plus Analyser (hard case version)


Front panel view

GA 21 front panel

Gas and electric connectors (full option)

GA 21 connections

Example screenshots

GA 21 example screen shots

Example printouts and screenshot from PC program

GA 21 example print out

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