12 Injection Port
12.2 Split/Splitless Injection System
134
GC-2014
12.2.4 Gas saver
The gas saver function reduces the split ratio during a split of splitless analysis. This reduces
the amount of carrier gas flowing through the split flow line, conserving carrier gas.
Even though this can change the split ratio, the column inlet pressure is kept at a constant
value. In other words, changing the split ratio does not affect the carrier gas flow rate
through in the column.
12.2.4.1 Screen description
Select [Gas Saver] (PF menu) from the [FLOW] key to display the Gas Saver screen
shown in Fig. 12.5.6.
12.2.4.2 Parameter list
GAS SAVER
Selection: On/Off, Default: Off
Select “On” to use the gas saver function.
Select “Off” to disable the gas saver function.
GAS SAVER SPLIT RATIO
Range: 0.0−9999.9, Default: 5.0
Set the split ratio which will reduce the split flow to conserve carrier gas.
Setting “0” closes the split flow line.
GAS SAVER START TIME
Range: 0.00−9999.99 min, Default: 1.00 min
Specify the period of time after analysis starts until the split ratio switches to gas saver
mode.
This period of time should be longer than the time required for the sample to move from
the injection port to the column.
Setting the gas saves start time too early can provide unpredictable quantitation results.
Fig. 12.2.7 Gas saver setup screen
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