Shellab BACTRON600 - Manual (Page 42)

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OPERATION (CONTINUED)
O PERATING THE P ASS B OX
The pass box is used to introduce items into or remove items from the workspace chamber.
Automatic Cycle
1. Make sure the inner pass box door is closed and secured.
2. Open the outer pass box door. If not already on, the Pass Box Aerobic light will illuminate,
indicating that the pass box has been exposed to the aerobic atmosphere of the room.
3. Load the pass box slider shelf with items to be introduced in the workspace chamber.
4. Close and secure the outer door. The Pass Box Doors light will then illuminate. The light
will only do so when both the inner and outer doors are closed. The Doors light must be
on for the auto cycle to initiate.
Note: Contact Sheldon Technical support if the Air Lock Doors light will not illuminate when both
doors are closed and secured.
5. Briefly depress the Auto Cycle Start / Reset Switch to the left (Start) to initiate the auto
cycle.
6. The Aerobic and Anaerobic indicator lights will alternately flash on and off, indicating that a
cycle is in process. The vacuum pump will cycle the air pressure inside the pass box three
times (from -18 inHg to -4 inHg), refilling twice from the GAS 2 IN port, and on the final
cycle from the GAS 1 IN port.
7. The anaerobic light will illuminate once the cycle has finished. The inner pass box door
may now be opened, and items introduced into the workspace chamber.
8. Do not open the outer pass box door while the inner pass box door is opened!
9. After removing items from the slider shelf, return the shelf to the pass box chamber. Close
the inner pass box door. This safeguards against inadvertently introducing oxygen into the
workspace chamber if someone opens the outer door later on.
Vacuum Interruption: The Chamber Gas light illuminates when the BACTRON is injecting AMG
into the workspace chamber. Chamber injections are made in response to the workspace
atmospheric pressure falling below a factory-set threshold. If the light illuminates while the vacuum
pump is active, the BACTRON will briefly depower the vacuum pump. If the Chamber Gas light
illuminates frequently during auto cycle, abort the cycle (see below). There may be a leak along the
inner pass box door, which is allowing the pass box to pull atmosphere out of the workspace
chamber and into the vacuum lines. Contact Sheldon Technical support.
Aborting: To abort the automatic cycle, depress and hold the Auto Cycle Start / Reset switch to the
right for three (3) seconds. The BACTRON will cease vacuuming and automatically restore
pressure to the pass box. The vacuum gauge must rise to at least -2 inHg (near room pressure)
before the Pass Box Aerobic and Anaerobic lights will stop flashing, and the inner pass box door
can be opened.