Recommended Starting Conditions For New Fid Methods - Agilent Technologies 7890 Series Advanced Operation Manual

5
Detectors

Recommended starting conditions for new FID methods

Table 44 Recommended starting conditions
Combustible gas mix
Detector temperature
Carrier gas flow (hydrogen, helium,
nitrogen)
Packed columns
Capillary columns
Detector gases
Standard installation
Column plus capillary makeup
Hydrogen
Air
With Nickel Catalyst Accessory:
Standard installation
Column plus capillary makeup
Hydrogen
Air
With Nickel Catalyst Accessory:
TCD to FID series installation
Column plus capillary makeup
TCD switching flow
Hydrogen
172
To change Lit offset:
Press [Config][Front Det] or [Config][Back Det].
1
Scroll to Lit offset.
2
Enter the new value and press [Enter].
3
See Table 44 for guidelines and rules to select initial
detector settings for new methods.
Make sure that the final hydrogen-to-air ratio is between 8% and 12%
Set to 20 °C above the highest oven temperature, depending on the column type.
A temperature of 300 °C provides a good starting point and easier ignition, and
minimizes water condensation.
The GC will not attempt to ignite the flame at a temperature <150 °C.
Suggest 10 to 60 mL/min
Suggest 1 to 5 mL/min
Flow range mL/min
10 to 60
24 to 60
200 to 600
10 to 60
24 to 60
200 to 600
10 to 60
24 to 60
Suggested flow mL/min
30
30
400
30
*
30
400
30
25
45*
Advanced Operation Manual