Thermo Scientific FOCUS GC, Инструкция по эксплуатации

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Chapter 3
Gas Control
Carrier Gas Parameters
82 Instruction Manual
Gas Saver
Flow
From 10 to 500 ml/min
in step of 1 ml/min;
Off
Activates gas saver control to reduces carrier gas
consumption after the injection or in Standby
(suggested at high split mode).
Gas Saver
Time
From 0 to 9.99 minutes
in steps of 0.01 min Enter the time after the injection when gas saver
flow will be activated.
Vacuum
Compensation
On - Off Use this option to compensate for a vacuum at the
end of the analytical column. When the box is not
checked calculation are made considering the
detector outlet at atmospheric pressure.
Leak check
It allows performing an automatic leak check. The GC starts to measure the
column flow with a true mass flow sensor and compares it to the calculated flow
from the original column constant to see if the numbers match. The instrument
assumes a gas leak exists if there is a significant difference.
To perform a leak check refers to Chapter 6
Performing an Automatic Leak
Check .
Column
evaluation
The column evaluation is an automatic measurement of the column resistance
that determines the column constant. To perform the column evaluation, the
system uses the correlation between the applied pressure to the flow and the
column temperatures. This operation must be carried out every time a new
column is installed. Before performing the column evaluation, a manual leak
test of the system must be carried out.
To perform a column evaluation refer to Chapter 6
Performing a Column
Evaluation .
Table 3-1. Carrier Gas Parameters Menu
Parameter Range Description