ISQ User Guide - Write Frame of Mind

1 Changing the Column
Replacing the Factory-Installed Column
d. Scroll to Leak Check Settings.
L. COL. SETT.
Check Leak press 200
Sensitivity 5.0
e. In the Check Leak press line, set the pressure at which the leak check will be
performed. The value must be between 10 and 999 kPa (1.45 and 145 psi) and must
be less than the carrier gas pressure coming into the GC.
f. In the Sensitivity line, set the maximum pressure drop that is allowed during the test.
The value must be between 1 and 10 kPa (0.145 and 1.45 psi). A typical value is
5kPa.
g. Press CLEAR to exit the Leak Check Settings menu and return to the previous menu.
L. COL. LEAK CHECK
Start leak check
Leak Check settings
h. Select Start leak check to begin operation. The split and purge valves of the selected
channel are automatically closed and the channel is pressurized with carrier gas to the
leak check set point.
CHECKING L COLUMN
Pressure (200)
Elapsed time 0.90
Use to abort
Note To abort a leak check, you can press STOP.
i. The system monitors the pressure for one minute. If the pressure does not drop more
than the maximum allowed sensitivity value, then the leak check will pass.
R/L.LEAK CHECK
COMPLETED
SUCCESSFULLY
Leak check passed.
If the leak check did not pass, you should use the leak detector to find and fix the
leaks.
Tip Leaks can be caused by not tightening the fitting on the column flowmeter
connector. We recommend that you check that fitting before looking elsewhere.
6 ISQ User Guide Thermo Scientific