User guide

320 Advanced User Guide
10 Detectors
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
Table 71 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 Ceramic bead
60 mL/min
Blos bead
120 mL/min