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Cedex HiRes Analyzer Operator’s Guide
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8.1.2. Running a Water Blank
Before an SST including Measurement can be run, a water blank (Water For Injection [WFI]) should be run to
check the condition of the reagents. No more than 20 counts should be recorded for this measurement. This can
be scheduled using the SST including Measurement button (see “
Creating SST checkpoints with and without
measurements”). The WFI measurement requires a relative deviation rather than an absolute deviation, which
means that 0 cannot be used as a Target Val ue as a relative deviation from 0 will always be 0.
Therefore, when setting up a WFI measurement, the Target Val ue should be set to 10 with a relative deviation
of 100%. This will result in an acceptance range of 0 – 20 objects (see Table 2).
8.1.3. Setting up the SSTFailureReaction in the System Options Menu
The reaction of the system to an SST failure depends on the confi guration in the System Options. The System
Options can be accessed under the Setup menu on the Control Center:
1
Open the System Options and click on the General tab.
2
Look for the parameter SSTFailureReaction.
Entering Restrict in the Value column will lead to prohibition of any further measurements, including
SST measurements, in the event of an SST failure. This will require a manual unlocking of the system in
the Lock – Unlock System area before measurement activity can be resumed (see “
Locking – Unlocking
the System
”).
If Warning is entered, measurement activity can be continued but there will be a warning about SST
failure before a measurement is carried out.
Choosing the Audit option will simply lead to a log entry in the audit trail fi le in the case of an SST failure.
There will not be any restrictions or warnings.
3
Click on Save to store the change.
■
Measurements that are run despite the fact that not all SST procedures are up to date or valid will have no
check-mark in the SST Valid box in the Measurement window.
The System Suitability Test (SST)
Creating SST Checkpoints
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