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BACTEC® 9050 System User's Manual
4.9 Power Failures and Manual Operation
The information in the system is stored in memory until a power failure occurs.
When a power failure occurs, the data is transferred into non-volatile RAM. Data
in NVRAM is maintained by a long-life battery.After the data is transferred, the
system is completely shut down. No vial testing occurs until power is restored.
When power is restored, the times that power was lost and restored are noted
in the system alert list and can be viewed on the display (note that if multiple
power failures occur, only the latest is retained in the alert list). Culture vial
testing resumes when power is restored.
For the period of time that power is out, the system misses one test reading for
each ten minutes of power outage. Although unlikely, missed readings can result
in detection failures.Therefore if testing is interrupted for longer than forty min-
utes, to ensure maximum recovery it is recommended that you perform a sub-
culture on ongoing culture vials.
You may, at your option, connect the system to an Uninterruptible Power Supply
(UPS). Use of a UPS may help prevent interruptions to testing, or - if the UPS is
connected to an emergency power line - the necessity of subculturing vials in
the event of a sustained power failure.
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