Topic History of: Problems with calibration
Max. showing the last 6 posts - (Last post first)
| admin |
Usually, the sample loop is at atmospheric
pressure before the injection is made.
Therefore the amount of any gas injected will
be a function of the temperature of the loop
and the atmospheric pressure. You are right
in saying that the pressure in the loop
increases when you inject but that increase
only serves to compress the sample gas, the
mass sample does not change.
Out of interest what carrier gas are you
using? If you are using a TCD, be careful, if
your are using Helium as the carrier because
the calibration for H2 is likely to be very
non-linear. |
| admin |
facing problems for calibrating gases in a
6890 GC which has three gas sampling valves
attached to it on top. I wanted to calibrate
for hydrogen . I have a pressure gauge
connected to the line close to GC. I know the
line pressure i know the temperature, i know
the flowrate ..i want to know the no. of
mols. But the temp changes as soon as the gas
enterd in the sample loop. I dont know the
pressure there in the sample. So considering
the line pressre , temp and flowrate if i
calculate the no, of mols it would not
represent the area in the chromatogram. Since
everything is changed now. So should i go for
sample loop volume, pressure , temp for
calculating no. of ols or i would take the
line pressure,temp,flowrate? |
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