INFICON 3000 Micro GC Gas Analyzer Operating Manual - Manual (Page 46)

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3000 Micro GC Operating Manual
3.4.4 Sample Pump
One or two sample pumps are installed internally in 3000 Micro GC. There is no
flow through the sample path until the pump turns on. When the sample pump turns
on, the sample is drawn through the sample inlet tubing and the sample injectors
open for the time specified in the acquisition method. Set pump time at a minimum
of 20 seconds. If sufficient sample gas is available, increase the pump time to 60
seconds. The sample pump draws at a rate of 10 mL/min.
NOTE: For specific applications, there is a mode of operation called continuous
where the pumps can be turned off and sample gas flows continuously
through the internal tubing. Continuous operation can only be used with
variable and fixed volume injectors.
Backflush injectors cannot be used in continuous mode. In continuous
mode, the sample valve always remains on (open) and sample gas can
flush the sample inlet lines and injector.
Figure 3-18 Sample pump