
Chapter 7 PSD Analysis
7-14 PerSeptive Biosystems
7
Purging collision
gas lines
Before turning on the collision gas, purge the lines to prevent
disruption of the vacuum.
CAUTION
If you do not purge the lines, the CID gas introduction may
increase the pressure in the vacuum and cause an Interlock
error.
Perform the following procedure if the CID gas has been off for
more than 15 minutes:
1. Observe the vacuum gauge, and allow the pressure on
BA1 to reach the typical pressure listed below:
2. Turn the top 3-way valve on the CID box to the Purge Cell
position for 1 to 2 seconds.
3. Turn the top 3-way valve to the Gas Inlet position for
1 second, then turn immediately to the Purge Cell
position.
4. Observe BA1 on the vacuum gauge panel.
5. When BA1 reads approximately 1 x 10
-6
Torr, turn the top
3-way valve to the Gas Inlet position for 2 seconds, then
turn immediately to the Purge Cell position.
6. Observe BA1 on the vacuum gauge panel.
7. When BA1 reads approximately 1 x 10
-6
Torr, turn the top
3-way valve to the Gas Inlet position for 3 seconds, then
turn immediately to the Purge Cell position.
At this point, the lines should be purged. If pressure is
greater than 2 x 10
-6
Torr, repeat step 7.
8. Turn the top 3-way valve to the Gas Inlet position, then
turn on the collision gas as described on page 7-15.
Model Pressure
Voyager-DE PRO ~8x10
-7
Torr
Voyager-DE STR ~2x10
-7
Torr
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