15 Inlets
222 Operation Manual
Setpoint dependencies
Some setpoints in the flow system are interdependent. If you change one setpoint, other
setpoints may change to compensate.
Initial values
The table shows recommended starting values for selected parameters.
Table 36 Setpoint dependencies
When you change These setpoints change
Column defined Column not defined
Purging You can change the
Pressure and Total flow
setpoints; other setpoints are
not affected.
Purge flow Total flow**
Pressure Total flow**
Column flow*
Column flow
*
* This setpoint appears in the column parameters.
** This value is actual only.
Pressure
Total flow**
Before and after sampling, not purging You can change the
Pressure setpoint; other
setpoints are not affected.
Pressure Column flow*
Total flow**
Column flow* Pressure
Total flow**
During sampling:
You cannot change pressure and flow setpoints during sampling time.
Table 37 Suggested starting values
Parameter Allowed setpoint range Suggested starting value
Oven initial time 0 to 999.9 minutes Interface purge time
Interface temperature Ambient + 10 C to 400 C Transfer line temperature
Interface sampling end 0 to 999.9 minutes 0.2 minutes longer than
introduction time
Interface purge time 0 to 999.9 minutes
Gas saver time 0 to 999.9 minutes Must be after purge time
Gas saver flow 15 to 100 mL/min 15 mL/min greater than
maximum column flow
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