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The Reduction Gas Analyser (RGA) at Weybourne Atmospheric Observatory is used to make quasi-continuous measurements of molecular hydrogen (H2) and carbon monoxide (CO) in atmospheric air. Measurements are made using a modified commercial Reduction Gas Analyser (RGA3, Trace Analytical, Inc., California, USA), which includes gas chromatography followed by the reduction of mercuric oxide. Mercury vapour from this reaction was detected by UVabsorption. Samples are analysed every six minutes and with reference to the MPI2009 scale and the NOAA2004 scale for H2 and CO, respectively. In addition the instrument can determine the H2 and CO concentration is discrete samples (i.e. whole air samples, SilcoCans).
 
Manufacturer & Model: RGA3, Trace Analytical, Inc., California, USA
 
Instrument Data Archive Name: The instrument name is used in the generation of the file names for the data files that are archived on CEDA. The names used do not always appear logical and this is for historical reasons. This instrument is referred to as  wao-rga
 
Applications: Atmospheric measurements of CO and H2
 
Keywords: Hydrogen, Carbon monoxide, RGA3
 
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