Metrohm 875 KF Gas Analyzer - Manual (Page 34)

4.2 Methods
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3 Open the Gas calibration_liquefied gas method under
File ▶ Open in the Methods part of tiamo TM . The method consists
of tracks that run from the top to the bottom. Each track is labeled
with a letter. The individual commands are numbered consecutively
from the top to the bottom. Search the R4 call command in the exit
track. Double-click on the command to edit it. Overwrite the first line
saying additional gas type by editing the line via the properties.
Click on the ÷ symbol to open the formula editor. Replace the term
additional gas type x in inverted commas with butadiene.