User guide

192 Advanced User Guide
8 Inlets
Cold split introduction
For cold split sample introduction, use an initial inlet
temperature below the normal boiling point of the solvent. If the
liner volume is enough to hold all the vaporized solvent, start
the first inlet temperature ramp at 0.1 minutes with a high
heating rate (500 °C/min or higher). The final temperature
should be high enough to volatilize the heaviest analytes from
the liner and should be held for at least 5 minutes. A final
temperature of 350 °C for 5 minutes has proven sufficient to
quantitatively transfer C
44
.
For larger injection volumes or to eliminate the solvent, hold the
initial temperature long enough to vent the solvent through the
split vent and then begin the first ramp. Use a fast rate for
thermally stable analytes. Slower rates may help minimize
thermal degradation in the inlet.
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.
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 ramp 1- 10.
Final time # Hold time at Final temp 1- 10.
Pressure Actual and setpoint inlet pressure. Controls capillary
column flow and linear velocity.