Thermo Scientific APEX 100 User Manual page 41

Explanation of the Theory Underlying the Pack-Gap Function
In the above example, if you enter a value of 100% for the pack-gap function, both
packs are rejected, because—as shown in the diagram below—the overlap distance of
the two packs falls within the 100% zone of the pack-gap function—which, in turn, falls
within the no-pack distances for Pack 1 and Pack 2. No-pack distances are calculated by
the detector, using input from the photo eye on the conveyor; or, they can be set by
you, the user—as described above.
Thus, by setting appropriate values for the pack-gap function, the detector will take one
of the following actions.
• Reject Pack 1 only
• Reject both packs
• Reject Pack 2 only
The following table illustrates what action the APEX will take, when a contaminant is
detected in one of the positions A–F in the diagram above and the pack-gap function is
set to 100%, 50%, or 25%.
Pack gap Pack rejected when contaminant in the following position (A–F)
A
100% 1
50% 1
25% 1
Thermo Scientific APEX User's Guide
B C
1 1 and 2
1 1 and 2
1 1
D E
1 and 2 1 and 2
1 and 2 1 and 2
1 and 2 2
F
2
2
2
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