Thermo Scientific FOCUS GC, Instruction Manual

Page: 165 / 356

Chapter 8
FID Menu Flame Ionization Detector (FID)
Instruction Manual 165
Flame Out Conditions
When the flame is accidentally extinguished, either permanently because of
exhausted fuel gas supplies or temporarily, the
Flame Out
message is displayed
in the menu and a message is recorded in the Run Log.
If the
Retry
function is turned
On
, the system will attempt to re-ignite the flame
up to three times.
Signal pA
0 - 1000.00 pA
Not editable This parameter shows the collector current in pico
amperes (standing current level). The displayed value is
also used to indicate the flame status. If the value is very
low (such as 0.3 pA), the flame is off. When the value
displayed is greater than the
Ignition threshol d,
the flame is on.
Ign. thresh
0 - 999 pA The FID produces a small signal current when lit. This
parameter defines the flame on condition. The FOCUS
GC uses this value to determine flame status (on or off)
and control automatic re-ignition. If
Flameout retry
is O n,
the flame will re-ignite if the signal drops below
this value. This line doesn’t appear at detector signal
range 2 and 3. (Threshold assumes 0 pA).
Flameout
retry
On – Off This indicates re-ignition status. Set On to program
when the flame re-ignition should be attempted. Refer to
Flame Out Conditions for more information. This line
doesn’t appear at detector signal range 2 and 3.
H2
Air
On - Off These indicate the hydrogen and air flow supplied to the
detector. You can only turn the flows on and off. Set On
to turn on the gas flows. Set Off to turn the flows off.
Make-up
On - Off This indicates the make-up gas used with the FID. You
can only turn the flows On and Off. Set On to turn on
the gas flows. Set Off to turn off the flow.
Table 8-1. FID Parameters (Continued)
Parameter Range Description