HP 5973 - To Vent the MSD

52
2 Operating the MSD
To vent the MSD
To vent the MSD
Software changes The software is revised periodically. If the steps in this procedure do not match
your MSD ChemStation software, refer to the manuals and online help supplied
with the software for more information.
If the data system is not working correctly, the MSD can still be vented safely. See
page 64.
1 If your system is equipped with a gauge controller, switch off the triode
gauge controller.
2 Select Diagnostics/Vacuum Control
from the View menu.
3 Select Vent from the Vacuum menu. Follow the instructions presented.
The vent program cools the GC/MSD interface heater and the GC oven. The pro-
gram turns off the analyzer heaters and the high vacuum pump. The software will
prompt you when it is safe to switch off the power.
4 When prompted, turn off the MSD power switch.
5 Unplug the MSD power cord.
6 Remove the upper MSD cover (page 50).
7 Turn the vent valve knob counterclockwise only 1/4 to 3/4 turns to admit
air into the vacuum manifold.
Do not turn the knob too far. Be sure to retighten the knob before pumping down.
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Be sure the GC oven and the GC/MSD interface are cool before turning off carrier gas flow.