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Pressure, temprature and flow rate in GC

http://www.chromforum.org/viewtopic.php?t=1907

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Pressure, temprature and flow rate in GC

Posted: Fri May 06, 2005 4:17 pm
by JI2002
I read an article about why carrier gas flow rate decreases when oven temp increases without changing the inlet pressure. The author talked about how carrier gas viscosity increases with increasing oven temp, therefore it causes the flow rate to decrease. Any other opinions about this? Thanks.

Posted: Fri May 06, 2005 6:18 pm
by DR
PV=nRT

You can maintain constant flow or constant pressure or constant mass (mass flow regulator - same as const. flow measured before inector?)depending on the type of regulator you have on your GC. The rest is pretty much up to T and will vary according to your program.
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