Voyager DP-263-S Guía de usuario Pagina 419

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Enhancing Fragmentation with CID
Voyager
Biospectrometry
Workstation User’s Guide 7-15
7
Turning on
collision gas
To turn on the collision gas after purging:
1. If the metering valve on the side of the CID box is set at
zero, turn the metering valve approximately 1/4 turn.
If the metering valve is not set at zero, do not turn the
valve.
2. Wait 1 to 2 minutes for BA1 on the vacuum gauge panel to
stabilize at 3 x 10
-6
Torr, or at the optimum pressure for
CID operation that you have determined and recorded for
your system.
3. If the pressure is lower than the optimum, turn the
metering valve one notch clockwise to a higher setting.
Wait for BA1 to stabilize at the optimum pressure.
If the pressure is higher than the optimum, turn the
metering valve one notch counterclockwise to a lower
setting. Turn the top 3-way valve to the Purge Cell
position, then to the Gas Inlet position. Wait for BA1 to
stabilize at the optimum pressure.
4. Continue adjusting the metering valve until BA1 is stable
at the optimum pressure.
NOTE: If BA1 is below the optimum pressure when
using a compressed gas supply, and you cannot
increase the pressure by turning the metering valve
clockwise to a higher setting, make sure the gas supply
is regulated to 2 to 5 psi.
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