5 Operating in EI Mode
To Vent the MSD
138 5977B Series MSD Operating Manual
7 Close shutoff valves to hydrogen sources that enter the analyzer if the
instrument is so equipped.
8 When prompted, turn the vent valve knob counterclockwise only 3/4 turns or
until you hear the hissing sound of air flowing into the analyzer chamber.
(See Figure 46.)
Do not turn the knob too far, or the O-ring may fall out of its groove.
Never open the vent valve without first closing the hydrogen supply line to all possible
sources of hydrogen entry to the analyzer. This requires closing the hydrogen shutoff
valve to the carrier gas flow module and the shutoff valve to the JetClean system
supply if either of these hydrogen sources exist on the instrument.
Figure 46 Vent valve knob
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