Nitrogen Phosphorus Detector (Npd) Theory Of Operation; Epc Detector - Agilent Technologies 6890 Series Service Manual

320 Nitrogen Phosphorus Detector (NPD)
Theory of operation
sensor, and a non-adjustable restrictor frit. The makeup gas and hydrogen
lines merge before entering the detector.
Air in
H in
2
Makeup in
Figure 320-2
2 of 32
Filter Proportional Pressure
frits valves sensors
PS
PS
PS
Pressure
control loops
EPC detector flow
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Restrictors
Vent
Electrically
heated
bead
Jun 2001