4-70
Agilent 7500 ICP-MS ChemStation Operator’s Manual
Tuning
Information on Sensitivity Adjustment
The Agilent 7500cs can be used with no gas (standard mode, cool mode) or may use
a reaction gas (reaction mode). In reaction mode, either hydrogen gas (H
2
mode) or
helium gas (He mode) is used as a reaction gas.
Even using reaction mode (H
2
mode and He mode) is used, if tuning is done in the
standard mode beforehand, tuning can be completed easily just by a partial change
of the lens voltage. Adjustment of the reaction gas flow rate is done by measuring
the flow rate correlation of the BEC (background equivalent concentration) with a
blank solution and a standard solution. This is described below.
In the cool mode, tuning is executed with the cool plasma condition which has the
cooler plasma temperature.
It is described for adjusting the sensitivity of the Agilent 7500cs for the next 4
modes in this section.
• Standard Mode (Page 4-70)
• Reaction Mode (H
2
Mode) (Page 4-72)
• Reaction Mode (He Mode) (Page 4-77)
• Cool Mode (Page 4-82)
NOTE Once a tuning parameter is determined, and a matrix sample is not introduced, only
a fine adjustment of voltage, flow rate, etc. is needed for daily tuning.
NOTE It is good practice for tuning parameter to be saved under different file names after
tuning in each mode.
NOTE For the ShieldTorch and Cool Plasma, refer also to the "Agilent 7500 ICP-MS Option
Instruction Manual".
Standard Mode (When Reaction Gas is Not Used)
Tune according to the function of each parameter above (Page 4-66) and the table of
each parameter's value.
It is also possible to tune in standard mode by using Autotune (Page 4-102).
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