INFICON Explorer Portable Gas Chromatograph - Manual (Page 201)

Explorer Operator Manual
199
Pressure
When adjusting the carrier gas pressure, ensure the flow through the detector is
maintained at a constant rate. Variations in the detector flow will result in baseline
instability, especially with high sensitivity applications. After you change the
pressure, allow a few minutes for the flow through the columns to stabilize. You can
set the pressure to any value between 0 and 14 psig.
Adjusting the pressure will effect all flow rates. For example if you increase the
pressure, the maintenance flow through the idle columns and the make-up flow
through the ECD (if it is installed) will also increase.
A higher pressure will result in increased flow rates but decreased operating time
from the internal cylinder. You may have to refill the internal cylinder more
frequently.
1. Press Enter Menu, SETUP, CONFIG, COLUMN. Select the column for
which you want to alter the pressure. Disable the other columns.
2. Press Exit to close the box. Press Enter Menu to close the menu.
3. Press Enter Menu, SETUP, CONFIG, METHOD and PRESS.
4. Use the arrow keys to enter the new column head pressure. Press Enter Menu.
5. If you need to change the pressure for the other two columns, repeat this
procedure for each column.
6. When you have changed the column pressure for each column, enable all the
columns required for your method.
If you have entered different pressures for each column, Explorer will require
approximately 5 minutes between analyses to adjust the flow rates and stabilize.