Inlet Systems
Packed column inlet
102
Trap(s)
External
Plumbing
Internal
Plumbing
Pressure
Gauge
Packed Column
Inlet
Electronic
Flow Sensor
(optional)
Mass
Flow
Controller
Column
To
Detector
Carrier
Gas
Flow Diagram, Packed Column Inlet (with electronic flow sensor)
Figure 6-2
Liquid sample is rapidly volatilized inside the inlet. To ensure complete
volatilization, inlet temperature typically should be at least 20
C greater
than the highest oven temperature to be used.
Assuming column and liner (plus insert, if used) are properly installed
and the system is leak•free,the following is information necessary for
proper operation.
Electronic flow sensor
If Electronic Flow Sensing (EFS) is installed in the carrier gas system to
the inlet, total supply flow rate through the system may be displayed
(see Chapter 4, Electronic Flow Sensing, for details). This is particularly
convenient in situations when carrier flow must be turned off (as when
changing gas supplies, or if supplies must be turned off nightly,
weekends, etc.).
Note: The EFS requires at least one hour for thermal equilibration for
reliable readings.
