HP 5973 MSD Hardware Manual page 17

• The flow control display shows the gas flow as a percentage of the total possible
• The flow control knob adjusts the gas flow. If the selected flow rate can not be
• The CI calibration valve is controlled by the ChemStation software, and opens
• The isolation valve prevents contamination of the flow control module by
Rear flow module cover
Isolation valve
Flow control board (under
Control panel
EI/CI GC/MSD interface
CI calibration valve
Mass flow controller
Reagent gas select valve
Reagent gas inlet lines
& $ 8 7 , 2 1
Try to avoid tuning any more often than absolutely necessary to minimize PFDTD
background and ion source contamination.
flow (5 ml/min for methane).
achieved or maintained, the numbers in the flow control display will flash.
automatically during CI autotune or manual tuning, allowing PFDTD to diffuse
into the ion source.
atmosphere while the MSD is vented or by PFTBA during EI operation.
 Hardware Reference
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