Operation
Using two injectors
71
When you set up the run parameters, you must identify which data channel is
for which injector.
Different communication devices assign the position and data channel
differently.
• Using a 6890 Series GC, the channel is assigned when you set up the
sequence.
• Using the ChemStations, you assign the channel when defining the
instruments.
• Using the 3396 integrator (INET), you assign the channel when you set up
the run parameters for the second injector.
Once both injectors have samples, they begin the injection cycle, including any
sample washes. After both injectors 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, then the tray picks up the
sample vial from the front injector first 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.
When the parameters tell the tray arm to deliver the same sample vial to both
injectors at the same time, the tray delivers the vial to the front injector first.
After the injection, the tray arm delivers this sample to the back injector and
delivers the next sample vial in the front injector sequence to the front injector.
These samples are injected at the same time. Similarly, if the first and last
sample vial parameters are the same for both injectors, the samples are
injected in the synchronous N-1 injection mode (see Figure 44).
Note: The ChemStation method for a single run will not allow you to set the
same vial number for front and back injector, however, you can run a dual-
column sequence with a single set of vials.
To Next Page
Loading...
Need help?
General
