88 Installation, Operation, and Maintenance
Part 2, Operation
4 Controlling the Sampler
Number of sample pumps—How many times (0–15) the syringe plunger is
moved up and down with the needle in the sample to expel air bubbles and
improve reproducibility.
Viscosity delay—How many seconds (0–7) the plunger pauses at the top of
the pump and injection strokes. For viscous samples, the pause allows the
sample to flow into the vacuum created in the syringe.
Number of sample washes—How many times (0–15) the syringe is rinsed
with sample before the injection. The injector lowers the syringe needle into the
sample vial, draws up sample, and empties it into one of the waste bottles. The
amount of sample used for wash is set in the Solvent Saving injector
configuration parameter defined on page 90.
Number of solvent A washes—How many times (0–15) the syringe is rinsed
with solvent from the solvent A (A, A2, A3) bottles.
Number of solvent B washes—How many times (0–15) the syringe is rinsed
with solvent from the solvent B (B, B2, B3) bottles.
Slow plunger—The speed of the syringe plunger during injection. Enables you
to reduce the average speed of the plunger and hold the syringe needle in the
inlet for 4 seconds after the injection. Turning the setpoint On pushes at a rate of
about 5 µL/sec (with a 10 µL syringe)—Off is about 20 times faster. The plunger
speed during the pump and waste dispensing does not change.
Dwell times—How long, in minutes (0–1), the needle remains in the inlet
before or after the injection.
Sampling offset—Enables variable sampling depth.
Table 1 4 Injection volumes for a 6890A or Plus GCs
Injection volume as percent of syringe size
Syringe stop Nanoliter adapter On Nanoliter adapter Off
12% 10%
2 10% 20%
3 20% 30%
4 30% 40%
5 40% 50%
6 50% Not available
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