GEM5000 Gas Analyzer
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9.6 Gas analyzer
For the GEM5000 gas analyzer the calibration options can be found by selecting the ‘Menu’
key followed by soft-key ‘Operation Settings’. Select ‘Key 2 – Gas Check’ then follow the
instructions on the analyzer screen by selecting ‘Key 2 – Gas Check’.
9.7 Calibration processes – best practice
The following process diagrams outline the calibration steps.
Ensure that you are regulating calibration gas down to below 200 mbar pressure, if
you’re not using a Landtec regulator. The use of a pressure relief valve is also highly
recommended.
When calibrating, it is recommended to use a calibration mixture close to the levels
you are trying to measure, i.e. if you are trying to measure gas migration on a closed
landfill, we’d recommend calibrating with CH4 5%/CO2 5%.
In regards to frequency, we would recommend that you perform a fresh air calibration
before each monitoring session, and a span calibration typical every 4 – 6 weeks.
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