Agilent Technologies 8890 User Manual

15 Inlets
224 Operation Manual
During sampling
Pressure upsets caused by switching valves in the external sampler can cause fluctuations in
column flow rates. To compensate for this, the interface is flow controlled during sampling
time. The sampling flow rate is calculated from the pressure setpoint that is active when
sample introduction begins. This flow control starts when the GC goes into the Pre Run state
(when your system is automated and the Pre Run light is on or during manual operation when
you press and ends after the interface’s Sampling end setpoint expires.
Flow to the interface is measured by a flow sensor and controlled by a proportional valve.
Valve
Frit Frit
Frit
Valve
EPC Module
FS = Flow Sensor
PS = Pressure Sensor
Column
FS
PS
PS
Carrier Supply
80 PSI
Septum Purge
Gas Sampling Valve
Headspace
Purge and Trap

Agilent Technologies 8890 Specifications

General

Brand	Agilent Technologies
Model	8890
Category	Laboratory Equipment
Language	English