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074-594-P1H Micro GC Fusion Operating Manual
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5.7.1.1 Variable Volume Injector
Valid Inject (ms) time set points for the Variable Volume injector range from 10 to 100
ms. A typical set point is 25 ms. An Inject (ms) time of 0 ms results in no injection.
• Values less than 10 ms may result in poor repeatability
• Longer injection times allow larger volumes of sample to be injected, which results
in higher sensitivity on a µTCD.
The Variable Volume Injector may be influenced by matrix effect as the
sample density varies with compositional changes.
5.7.1.2 Variable Large Volume Injector
The Variable Large Volume Injector (LVI) should only be used when lower detection
limits (1-10 ppm) are required.
Valid Inject (ms) time set points for the Variable Large Volume Injector range from 10
to 450 ms. A typical set point is 100 ms. An Inject (ms) time of 0 ms results in no
injection.
• Values less than 10 ms may result in poor repeatability
• Longer injection times allow larger volumes of sample to be injected, which results
in higher sensitivity on the µTCD
The Variable Large Volume Injector may be influenced by matrix effect as
sample density varies with compositional changes.
5.7.1.3 Fixed Volume Injector
The Fixed Volume Injector provides the best accuracy and precision for
concentrations above 200 ppm. It minimizes matrix effects as sample density varies
with compositional changes.
Valid Inject (ms) time set points for the Fixed Volume Injector range from 0 to 50 ms. A
typical set point is 30 ms. An Inject (ms) time of 0 ms results in no injection.
• Values less than 15 ms may result in poor repeatability
