68 Advanced Operation Manual
3 Inlets
Some experimentation is needed to refine the operating
conditions. Table 13 provides starting values for the critical
parameters.
Setting parameters for the splitless modes
Mode: The current operating mode—Splitless or Pulsed
splitless.
Tempera ture Actual and setpoint inlet temperatures.
Initial time Hold time at the initial inlet 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 in psi, bar, or
kPa
Pulsed pres The inlet pressure you desire at the beginning
of a run. The pressure rises to this setpoint after [Prep Run]
is pressed and remains constant until Pulse time elapses,
when it returns to Pressure.
Tabl e 13 Splitless mode inlet parameters
Parameter Allowed setpoint range Suggested starting
value
Oven temperature No cryo, ambient+4 °C to 450 °C
CO
2
cryo, –40 °C to 450 °C
N
2
cryo, –80 °C to 450 °C
10 °C below solvent
boiling point
Oven initial time 0 to 999.9 minutes ≥ Inlet purge time
Inlet purge time 0 to 200.0 minutes 2 x Liner volume
Column flow
Gas saver time 0 to 999.9 minutes After purge time
Gas saver flow 15 to 200 mL/min 15 mL/min greater
than maximum column
flow
Inlet temperature No cryo, oven temp + 10 °C
CO
2
cryo, –70 °C to 450 °C
N
2
cryo, –160 °C to 450 °C
10 °C below solvent
boiling point for 0.1min,
then ramp up
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