Carrier Gas Parameters; Flow Mode; Constant Flow; Constant Pressure - Thermo Scientific FOCUS GC Instruction Manual

Chapter 3
Gas Control

Carrier Gas Parameters

This paragraph explains the electronic programming and control of the GC carrier
gases. The Digital Pressure Flow Control (DPFC) module regulates carrier gas
electronically. You control the gas flow by programming parameters in the carrier
gas menu.
The
of the carrier gas type. Parameters change according to the selected flow mode:
constant flow or constant pressure.
In Main Menu, move the cursor until
the

Flow Mode

Two flow modes are available.

Constant Flow

In constant flow mode, the column flow is kept constant throughout the analysis.
The pressure at the column head will change with the column temperature to
maintain the set flow.

Constant Pressure

In constant pressure mode, the pressure at the column head is kept constant
throughout the analysis. Flow rate will decrease as oven temperature increases.
80
menu includes the control parameters for the carrier gas, regardless
CARRIER
menu.
CARRIER
Carrier
CARRIER
Flow mode Const flow

Carrier Gas Parameters

is selected. Press ENTER to open
Instruction Manual