Loop Equilibration; Injecting The Sample - Agilent Technologies G1289 Operating Manual

Carrier
gas flow
Auxiliary gas
flow for vial
pressurization
Open
Closed
Carrier gas
Auxiliary gas
Figure 6. Loop fill. S1 is closed. S2 is open (to fill loop).

Loop Equilibration

Both pressure and vent valves are closed for the length of time assigned to this
setpoint.

Injecting the Sample

The sample valve brings the sample loop in line with the carrier gas flow. The
carrier gas flows through the sample loop and the transfer line into the GC inlet
port. This sweeps the sample into the GC.
Mass flow
controller
Pressure
transducer
Pressure
Flow
regulator
restrictor
Needle
Headspace
vial
Introduction to Headspace and to the 7694 Headspace Sampler
Pressure
Vent
transducer
S2
S1
6
5
Principles of Operation
1
2
3
4
Sample
loop
To GC
17