Shel lab BACTRON300, Инструкция по установке и эксплуатации, Страница: 60 / 86

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USER MAINTENANCE (CONTINUED)
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EAK
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IAGNOSTIC
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NIT IN
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Perform this procedure to check for leaks in and around the workspace chamber when the
BACTRON is loaded with samples and cannot be taken out of use. Leaks can result from damage,
long-term wear on BACTRON components, or from user error.
Establish a Baseline
A baseline of AMG usage should be established before attempting to determine if the workstation is
leaking. Because the rate of AMG use is increased by users accessing and working within the
workspace chamber, the baseline should be established for when the unit is sitting undisturbed.
1. Record the gas cylinder gauge level at the end of the workday. Note the gauge level next
morning. Read the Normal Gas Consumption section on the previous page.
2. If the BACTRON is using a significant amount of AMG overnight while sitting undisturbed, it
is likely there is a leak. Review the AMG cylinder readings recorded in the maintenance log
to see if a period of increased usage or loss can be identified.
3. If the BACTRON is injecting AMG more frequently than every 30 minutes after sitting
undisturbed overnight, it is highly likely there is a leak.
a. The Chamber Gas indicator will illuminate when the BACTRON is injecting AMG into
the workspace chamber to main overpressure. Injections are accompanied by a
clicking noise that is the chamber gas solenoid opening then closing.
Verify Chamber Overpressure
Verify that the manometer has been periodically refilled or topped off as part of daily maintenance.
This is necessary for the manometer to show an accurate pressure reading. Allowing the
manometer to run dry will result in a major chamber leak.
4. If the manometer has been correctly filled and the water level is not depressed to the lower
reference ring and the BACTRON is not injecting AMG frequently, the unit may be failing to
inject gas or may not be supplied with gas.
5. If the water level is not depressed and the BACTRON is injecting AMG frequently it is likely
there is a significant leak.
Check the Pass Box
Verify the integrity of the pass box if the previous steps indicate a leak.
6. Check the pass box door gaskets. There should be no brittleness or dryness, and no
cracks.
7. Check that both gaskets are securely seated on the mounting frames. Sample media is
sticky, and if spilled, can cause a pass box door to pull a gasket off the mounting frame.
8. The Pass Box Doors light does not illuminate when both doors are closed, check that both
doors are sealed. The pass box door windows should sit flush against the door gaskets.
9. Verify that users are closing the inner pass box door after transferring items into or out of
the workspace chamber.