Shimadzu PDA-7000, Instruction Manual

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4 Operation
4-5
(2) When the instrument is not used or at nighttime
When analysis is not carried out for a long time or at nighttime, argon gas flow rate
can be reduced to 100mL / min - 200mL / min by adjusting the valve for no use
instrument or nighttime.
When source SW is turned off, argon gas flow rate can be set to this flow rate.
The BYPASS valve can also be closed with the main cock of the argon gas cylinder
open.
Return the argon gas flow rate during standby to the original value prior to starting
analysis.
Caution
Do not over-tighten the BYPASS valve because it may break.
Note
If nitrogen is contained in an analytical element, reducing the gas
flow rate during standby may influence analytical values.