User guide

230 Advanced User Guide
8 Inlets
A single temperature ramp is enough for the injection process.
The remaining ramps may be used to clean the liner or to
reduce the inlet temperature in preparation for the next
injection.
Hot split introduction
For hot split introduction, set an initial temperature high
enough to volatilize the analytes. No additional thermal
parameters are required as the inlet will maintain the setpoint
throughout the run.
Because of the small liner volume (about 120 microliters), the
PTV has a limited injection capacity with hot split introduction.
Injection volumes exceeding 1 μL in the hot split mode may
overflow the inlet causing analytical problems. Cold split
introduction avoids this potential problem.
Setting parameters for split mode operation
Mode: The current operating mode—split or pulsed split
Tem pe ratur e Actual and setpoint inlet temperatures.
Initial temperature Starting temperature for the inlet.
Initial time Hold time at the inlet initial temperature.
Rate # Temperature program rates for inlet thermal ramps.
Final temp # Final inlet temperature for ramps 1, 2, and 3.
Final time # Hold time at Final temp 1, 2, and 3.
Pressure Actual and setpoint inlet pressure. Controls capillary
column flow and linear velocity.
Split ratio The ratio of split flow to column flow. Column flow
is set in the column parameter list. This line does not appear if a
column in the flow path is not defined.
Split flow Flow, in mL/min, from the split/purge vent. This line
does not appear if a column in the flow path is not defined.