106 Troubleshooting and Maintenance Manual
6 Vacuum System
CI Calibration Valve
The CI tuning compound is perfluoro-5,8-dimethyl-3,6,9-trioxidodecane
(PFDTD). The CI calibration valve is part of the reagent gas flow control
module. It is controlled by the MassHunter Workstation software. It opens
automatically during CI autotune or manual tuning, allowing PFDTD to diffuse
through the GC/MS interface and into the ion source.
Figure 20 CI calibration valve
CI calibration valve
CI calibration vial
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