Thermo Scientific FOCUS GC, Instruction Manual, Page: 154 / 356

Chapter 7
Column
Keeping Leaks Under Control
154 Instruction Manual
OPERATING SEQUENCE
Performing an Automatic Leak Check
When you perform an automatic leak check of the FOCUS GC system, the GC
measures the column flow with a true mass flow sensor and compares it to a
calculated flow value obtained from the original column constant to see if the
numbers match. The instrument detects a gas leak if there is a significant
difference between the two values.
To start the leak check operate as follows:
1. In Main Menu move the cursor until
Carrier
is selected, then press
ENTER
.
2. Scroll to
Leak check
and press
ENTER
to open
Leak Check
menu.
3. To start column evaluation, scroll to
Run leak check
and press
ENTER
.
4. The system is automatically pressurized with carrier gas and sealed to
perform leak check.
NOTE To exit
LEAK CHECK
menu without performing column evaluation, scroll to Exit w/o leak
check and press ENTER.
Leak check cannot be started in the following cases:
CARRIER (He)
Leak Check
LEAK CHECK
Run leak check
Exit w/o leak check
LEAK CHECK
Oven not ready