TheMG#2GCusesasingleautomated10portGasSamplingValveandmultiplecolumns toseparatea
widevarietyofcompounds. Itachievesthisbyturningthecarriergasflowtoeachcolumnonatdifferenttimes
during the run. Thisprocedureallows theMolecularSieve13xcolumn tocompletelyseparateH
2
,O
2
,N
2
,
CH
4
andCObefore thecarrier flow to theHayesep-Dcolumn is turnedon. TheHayesep-Dcolumn then
separatesallcompounds in theC
1
-C
6
range. Anoptional30-meterMXT-1capillarycolumnseparates the
remaininghydrocarbons throughC
20
,using thesamecarriergasflowas theHayesep-DcolumnandanFIDor
HIDdetector.
POPULAR CONFIGURATION GCs
Multiple Gas Analyzer #2
Theory of Operation
TheMG#2isplumbedwithtwoseparatecarriergasflows,eachregulatedbyElectronicPressureControl
(EPC) through thePeakSimpledata system. Carrier 1 flows through sample loop#1 to theMoleSieve
column, thenon through the“Tee” to theTCDdetector. Carrier 2 flows through sample loop#2 to the
Hayesep-Dcolumn, then through the“Tee” to theTCDdetector. Carrier#1and#2flowsare turnedONand
OFFbyPeakSimple,controlledby theuserwithanEvent table.
When theMG#2valve is
in the LOAD position,
loops #1 and #2 are
loadedwiththesamplegas
streamwhilecarrierflows
#1 and #2 bypass the
loopsand travelon to the
columns.
When theMG#2valve is
in the INJECT position,
carriers #1 and #2 flow
through thesample loops,
sweepingtheircontentsto
thecolumns.
