Thermo Scientific APEX 100, User Manual, Page: 40 / 442

Page 40
Thermo Scientific APEX User’s Guide
8) Press the Go button repeatedly until all the warning, alarm, and fault symbols are
cleared from the menu, as shown below.
Detection, no-Pack
9)
Press the Back button to save your setting and exit the menu. Now, no rejects are
made when contamination that is not associated with a package, is detected by the
APEX.
Keying In the Pack Gap
The “pack gap” is expressed as a percentage and, in most conveyor applications, should
be set to 100%, the default value. Changing the pack gap, however, allows you to fine-
tune whether the APEX rejects only one or both units of product (also known as “packs”
or “packages”), when there is uncertainty (explained below) about which of two packs
entering the search head one after another is contaminated.
Pack Gap
Example
Let us assume the following.
• You are testing multiple units of product (packs or packets) in a conveyor
application, where the length of the gap between the packs is about the same as
the pack length.
•
The pack-gap function is currently set to the detector’s default value of 100%.
In this type of conveyor application, where you are testing multiple units of product
(such as packets of salted butter), let us look at an individual packet of contaminated
butter. Clearly, metallic contaminants could be present anywhere in the packet—in the
top, middle, sides, or bottom of the package, or in the leading or trailing edge of the
packet. Unfortunately, when testing multiple packets, if the metallic contaminant is in
the trailing edge of Pack 1 (the first packet entering the search head), it may be hard for
the detector to distinguish whether the contamination is in Pack 1, or the next pack that
enters the search head, Pack 2.