Detectors; Internal/External Plumbing: Fid And Npd Without Epc - Agilent Technologies 6890 Series Operating Manual

Part 2. NonEPC control

Detectors

NonEPC detectors have internal single-stage pressure regulators for some gas
streams. You should still use external two-stage regulators.
You may also want to use traps to remove contaminants from the gas supply. If
so, they should be as close to the back of the GC as possible.

Internal/external plumbing: FID and NPD without EPC

Hydrogen and air flows for these detectors are controlled by external pressure
regulators and internal flow restrictors. Makeup gas is controlled by an internal
pressure regulator located behind the detector positions. See the Detectors
volume for flow rate details.
Makeup in
Figure 12 FID and NPD without EPC
EXTERNAL
pressure
regulators
Air in
H2 in
Internal
pressure
regulator
6890 GC
Keyboard-controlled
On/off solenoid
valves
Restrictors
Flow and Pressure Control
Detectors
FID
or
NPD
73