Agilent Technologies 7820A

30 Advanced User Guide
3 Inlets
The S/SL inlet pulsed split and splitless modes
The pressure pulse modes increase inlet pressure just before the
beginning of a run and return it to the normal value after a
specified amount of time. The pressure pulse:
• reduces the solvent vapor volume
• reduces the risk of inlet overload
• tightens the sample band
• may allow use of a 2 mm liner, reducing the active glass area
If your chromatography is degraded by the pressure pulse, a
retention gap may help restore peak shape.
Valve
Frit Frit
EPC/EPR Module
Valve
Split Vent Trap
Inlet Weldment
FS = Flow Sensor
PS = Pressure Sensor
FS
PS
Split
Carrier Supply
80 PSI
Septum Purge
Column
NOTE
Pulsed split and pulsed splitless modes are not supported on EPR
(electronic pneumatics regulation) equipped GCs.