Agilent Technologies 6890 Series - Nitrogen Phosphorus Detector (NPD) Theory of Operation; EPC Detector

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