Flow and Pressure Control Part 1. Electronic Pneumatic Control (EPC)
Detectors
62
Detectors
Although EPC detectors have built-in pressure regulation, you still need external
regulators so that the electronic control has a stable gas supply to work with.
You may 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.
Figure 7 Internal/external plumbing: FID and NPD with EPC
For more detail, see the Detectors volume.
EXTERNAL
pressure
regulators
Air in
H2 in
Makeup in
Proportional
valves
Pressure
sensors Restrictions
Control
FID
or
NPD
6890 GC
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