HP 5973 - Page 35

2 Operating the MSD
35
.
Moving or storing the MSD requires special care
The best way to keep your MSD functioning properly is to keep it pumped
down and hot, with carrier gas flow. If you plan to move or store your MSD,
a few additional precautions are required. The MSD must remain upright at
all times; this requires special caution when moving. The MSD should not
be left vented for long periods.
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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.
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vent or shut off the power on a diffusion pump MSD while the pump is hot.
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vent while the turbo pump is still spinning at more than 50%.
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Column flow rate into the MSD during tuning or data acquisition should not exceed
2.0 ml/min for the diffusion pump MSD or 4.0 ml/min for the turbo pump MSD. Optimum
sensitivity generally occurs at approximately half the maximum allowable flow.