REFLOW TRACKER Surveyor 49
• Saving the results and displaying them (graphically and numerically); they can
also be printed.
WARNING
Never carry the Surveyor assembly by holding the attached thermocouples. This can
lead to injury by dropping the equipment onto your body, and may damage the
equipment itself.
On removal from the oven, the assembly, including logger, will be hot enough
to burn skin – even though its temperature will not be apparent.
Use protective gloves.
The operator will be given one of the following clear results in a ‘traffic lights’
display:
red – Part of the profile falls outside the tolerance band (or, if two tolerance bands,
outside the outer). The production manager should be informed immediately.
yellow (only if two tolerance band are defined) – Part of the profile falls outside the
inner band but none of it is outside the outer band. The oven may be drifting out of
specification.
green – The whole profile falls within the tolerance band (or, if two tolerance bands,
within the inner band).
Surveyor Index
If the profile run has been performed in Technician Mode, the downloaded
results and analyses will be displayed graphically and numerically (they can also
be displayed in Operator Mode, if this has been enabled by the technician).
A key feature of the results is the Surveyor Index, which gives a measure of
the overall amount by which each probe’s profile-run data differs from the
baseline survey. It is calculated as the average (multiplied by 10) of the absolute
differences in temperature between baseline survey and profile run for each
data point. Surveyor Index figures are given a positive value if the profile-run
data averages higher than the baseline survey, and negative if lower than the
baseline survey.
Trends and Predictions with SPC
The main benefit of using the fixed sensors of the Surveyor system is that they
provide consistent and comparable data on which subsequent Statistical Process
Control (SPC) analysis can be conducted so that trends in the data can be
identified and future oven performance predicted.
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