Flame Ionization Detector (Fid) Theory Of Operation; Manually Controlled Detector - Agilent Technologies 6890 Series Service Manual

310 Flame Ionization Detector (FID)
Theory of operation
sensor, and a non-adjustable restrictor frit. The makeup gas and hydrogen lines
merge before entering the detector.
Filter
frits
Air in
H in
2
Makeup in
Figure 310-2

Manually controlled detector

The manually controlled FID has three pneumatic supply lines for air, hydrogen
and makeup gas. All three lines have an on/off solenoid valve and a non-
adjustable restrictor frit. In addition, the makeup gas line has a pressure
regulator to change flow without changing supply pressure. The makeup gas
and hydrogen lines merge before entering the detector.
2 of 24
Pressure
Proportional
sensors
valves Restrictors
PS
PS
PS
Pressure
control loops
EPC detector flow
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Vent
Jun 2001