Operation Guide
Using Two Injectors
14
Using Two Injectors
With two injectors mounted on the GC, you can use the front injector or the back
injector or both injectors simultaneously.
Two-injector configurations have the following characteristics:
• The system sends one injector ready signal to the GC when both injectors
are ready and one start signal at the beginning of the injection stroke.
• The two injectors inject simultaneously.
With A Tray
Set run parameters for each injector in the sequence.When you set up the run
parameters, you must identify which data channel is for which injector.
• When using an 6890 Series GC for sampler control, you assign the channel
when you set up the sequence.
• When using the Agilent ChemStation for sampler control, you assign the
channel when defining the instruments.
• When using the 3396/3397 Integrator (INET) for sampler control, you assign
the channel when you set up the run parameters for the second injector.
When both injectors have samples, they begin the injection cycle together,
including any sample washes. After they have completed the specified sampling
steps, they inject the samples. After the injection, both injectors go through the
solvent wash cycle. When both injectors are done, the tray picks up the sample
vial from the front injector and returns it to its original position on the tray, then
picks up the vial from the back injector and returns it to its original position.
Without A Tray
The injectors go through the same motions as with a tray. The injectors inject
samples from position 1 first, followed by samples from the remaining sample
vial positions. If the two injectors do not have the same number of samples, the
injector that completes its sequence first remains idle while the other finishes.
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