5 Other Setup Tasks
To confirm the collision cell gas flow rate (6470A and 6495A/B only)
104 Agilent 6400 Series Triple Quad LC/MS System Installation Guide
Figure 57 CC Gas Flow values
The automated procedure for setting the CC gas flow is based on a linear
relationship between CC DAC and m/z 322/290 abundance ratio in a tested CC
pressure range. This procedure has been tested for linearity between CC DAC
values that correspond to CC pressure between approximately 5 to 10 mTorr.
In case the plot shown in Figure 56 is not linear between DAC = 500 to 700,
reset the Start DAC and End DAC range and repeatedly adjust LabAdvisor CC
DAC for more accurate CC pressure setting.
For example, if the plot you get is not linear between DAC = 600 to 700, reset
the Start DAC to 400 (instead of 500) and End DAC to 600 (instead of 700),
and then repeat the measurement.
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