Installation manual

92 5975 Series MSD Operation Manual
3 Operating in Electron Impact (EI) Mode
8 Once communication with the PC has been established, click OK.
9 When prompted, turn on the GC/MSD interface heater and GC oven. Click
OK when you have done so.
The software will turn on the ion source and mass filter (quad) heaters. The
temperature setpoints are stored in the current autotune (*.u) file.
10 After the message Okay to run appears, wait 2 hours for the MSD to reach
thermal equilibrium. Data acquired before the MSD has reached thermal
equilibrium may not be reproducible.
Figure 24 Pumping down
CAUTION
Within 10 to 15 minutes the diffusion pump should be hot, or the turbo pump speed
should be up to 80% (Figure 24). The pump speed should eventually reach 95%. If these
conditions are not met, the MSD electronics will shut off the foreline pump. In order to
recover from this condition, you must power cycle the MSD. If the MSD does not pump
down correctly, see the manual or online help for information on troubleshooting air
leaks and other vacuum problems.
CAUTION
Do not turn on any GC heated zones until carrier gas flow is on. Heating a column with
no carrier gas flow will damage the column.