Detectors 5
Advanced Operation Manual 189
minimizing hydrocarbon ionization, while the alkali ions on the
bead surface facilitate ionization of nitrogen- or
phosphorus- organic compounds. The output current is
proportional to the number of ions collected. It is sensed by an
electrometer, converted to digital form, and sent to an output
device.
NPD flow, temperature, and bead recommendations
Valve
Frit
Frit
Valve
PS = Pressure Sensor Column
PS
PS PS
Valve
Frit
Restrictor Restrictor
Restrictor
EPC Module
H
2
Air
Vent
Electrically
heated bead
Makeup
Tabl e 49 General operating values
Gas or Setting Recommendation
Carrier gas (helium, hydrogen, nitrogen) Capillary, choose optimum flow
based on column dimensions.
Detector gases
Hydrogen Ceramic bead
2 to 5 mL/min
Blos bead
1 to 3 mL/min
Air 60 mL/min
To Next Page
Loading...
Need help?
General
