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Running a Baseline Survey and
Setting Tolerances
Running the Baseline Survey Wizard in Technician Mode (see box) allows
you to perform a baseline survey of a correctly functioning oven with given
heater settings (defined in a recipe), thereby establishing an ideal temperature
profile for a given process and defining limits – tolerance bands – within
which the oven's performance must fall; limits can be defined to create either a
single tolerance band or two bands – an inner and an outer.
To run the wizard, click
Baseline Survey from the menu bar. The wizard guides you through the whole
process, but note especially the following.
• After setting the oven temperatures, it is essential to wait until the oven
has stabilized at these settings before proceeding.
• Take care when defining the tolerance band(s): too narrow a band will
result in many false alarms during subsequent comparative profile runs, and
too wide a band will allow the process to drift too far from the ideal before
an alarm is produced. There are two key aspects to consider.
○ If no oven was specified at the start of the wizard, the tolerance band will
apply to the entire baseline survey data. Thus it is then necessary, when
defining the tolerance band, to specify the start and end points of the
band in order to avoid analyzing irrelevant data collected before the
Surveyor assembly enters the oven and after it has left it.
○ Once the start and end are defined, the tolerance band automatically
created by the software can be modified manually as shown in the wizard.
This may be advisable (e.g.) in areas of the oven where control is less
critical (such as the entry hood, or the end of the cooling zone) and the
tolerance band can thus be locally widened.
Performing a Profile Run
Profile runs to assess the oven's performance on a regular basis will normally be
carried out simply by running Insight in Operator Mode (see box, p. 47),
though the operator's role can also be carried out in Technician Mode by using
the Operator Wizard (click
New > Profile Run from the menu bar).
The wizard guides the oven operator through a basic profile run, assessing the
oven's performance against a pre-existing baseline survey. This involves:
• Preparing the logger for a profile run.
• Downloading the data to the PC after the run.
• Receiving a pass/warning/fail notification of oven performance.
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Surveyor
or
on the Insight toolbar, or select File > New >
or
on the Insight toolbar, or select File >
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