Everycompoundpossessessomedegreeof thermalconductivityand thereforemaybemeasuredwitha
TCDdetector. TCDdetectorsaremostoftenusedwithheliumasacarriergasbecauseofhelium’shigh
thermalconductivity,butothergasessuchasnitrogen,argon,orhydrogenmayalsobeusedasacarriergas. A
TCDdetectsallmolecules inconcentrationsfrom100%down toaround100ppm, and isespeciallyusefulfor
measuring inorganicgases likeO
2
,N
2
,CO&CO
2
.
Expected Performance
POPULAR CONFIGURATION GCs
Educational TCD
TCDDetector Noise
Column=1mSilicaGel
Carrier=Heliumat10mL/min
TCDcurrent=LOW
TCDTemp=100
o
C
TemperatureProgram:
Initial
Hold Ramp Final
80
o
C 10.00 0.00 80
o
C
Column=1mSilicaGel
Carrier=Heliumat10mL/min
Sample=0.5cc10,000ppmCO
2
TCDcurrent=LOW
TCDTemp=100
o
C
TemperatureProgram:
Initial
Hold Ramp Final
80
o
C 7.00 0.00 80
o
C
Factory test runof an
Educational TCDGC
NoiseLevel=Approximately20
µ
V frompeak topeak
20
µ
V
RESULTS:
Component
Retention
Area
O2N2
0.450
1252.9980
CO2
2.500
13.6460
Total
1266.6440
