5 Operating in EI Mode
Venting the MSD
116 5977B Series MSD Operating Manual
Venting the MSD
The DS guides you through the venting process. It turns off the GC and MSD
heaters and diffusion pump heater or the turbo pump at the correct time. It also
lets you monitor temperatures in the MSD and indicates when to vent the MSD.
The MSD will be damaged by incorrect venting. A diffusion pump will
backstream vaporized pump fluid onto the analyzer if the MSD is vented before
the diffusion pump has fully cooled. A turbo pump will be damaged if it is vented
while spinning at more than 50% of its normal operating speed.
For complete venting instructions, see “To Vent the MSD” on page 136.
Make sure the GC/MSD interface and the analyzer zones are cool (below
100 °C) before you vent the MSD. A temperature of 100 °C is hot enough to
burn skin; always wear cloth gloves when handling analyzer parts.
If hydrogen is used as a carrier gas or JetClean system supply, the carrier and
JetClean system supply shutoff valves must be closed before turning off the
MSD power. If the foreline pump is off, hydrogen will accumulate in the MSD
and an explosion may occur. Read “Hydrogen Safety” on page 24 before
operating the MSD with hydrogen gas.
Never open the vent valve or shut down the vacuum pumps without first
closing the shutoff valves for all hydrogen flows to the analyzer. This includes
hydrogen carrier gas and hydrogen for the JetClean system.
Never vent the MSD by allowing air in through either end of the foreline hose.
Use the vent valve or remove the column nut and column.
Do not vent while the turbo pump is still spinning at more than 50%.
Do not exceed the maximum recommended total gas flow. (See Table 3 on
page 18.)
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