Shel lab BACTRON300, Инструкция по установке и эксплуатации, Страница: 51 / 86

51 | P a g e
OPERATION (CONTINUED)
C
YCLING THE
P
ASS
B
OX
The pass box operates as an airlock, so at least one door must be closed at
all times when an anaerobic atmosphere is present in the workspace
chamber. If the main control panel Aerobic light is lit, the outer pass box door
has been opened since the last auto cycle, allowing oxygenated atmosphere
into the pass box. Always run a pass box cycle prior to opening the inner pass
box door when the Aerobic light is on.
Auto Cycle
1. Both pass box doors must be closed and latched, with the Doors light illuminated on the
main control panel, for the auto cycle to launch.
2. Briefly depress the Automatic Start / Reset Switch to the left to initiate the auto cycle.
a. The Aerobic and Anaerobic indicator lights will flash alternatingly, indicating the pass
box is being cycled.
b. The pass box will evacuates down to -18 inches of mercury pressure (inHg), and then
refill with purging gas three times. The third purge is always AMG drawn from the GAS
1 IN port.
c. When the cycle finishes the Anaerobic light will illuminate on the main control panel.
3. Do not open the outer pass box door while the inner pass box door is opened !
4. Always close an open pass box door after offloading or loading items.
a. This safeguards against accidental exposure to oxygen from an inattentive user
opening the outer door while the inner door is open.
Aborting : To abort a running auto cycle, depress and hold the Auto Cycle Start / Reset switch to
the left for 3 seconds . The BACTRON will cease vacuuming and automatically restore pressure to
the pass box. The vacuum gauge must rise to at least -2inHg (near room pressure) before the Pass
Box Aerobic and Anaerobic lights will stop flashing, and the inner pass box door can be opened.
Vacuum Interruption
The pass box will briefly cease vacuuming down during a pass box cycle if the BACTRON injects
AMG into the workspace chamber. Injections are made in response to the chamber atmosphere
pressure falling below 0.5in (1cm) relative water column pressure. If the Chamber Gas light
illuminates frequently during a cycle, abort the cycle. There may be a leak along the inner pass box
door, allowing the pass box to pull atmosphere out of the workspace chamber and into the pass
box vacuum line. Check that the inner pass box door is latched and sealed. Contact Technical
Support if gas injections interrupt the next cycle attempt.
Figure 30: Pass Box