Selecting The Correct Photo Registration For Rejects - Thermo Scientific APEX 100 User Manual

7) If you need to change the polarity on Input 2 to a negative polarity, press the Go
button, and the in-feed photo-eye input screen appears.
Infeed Photo Eye Input
8) Press the left-navigation button to underline the + sign.
9) Press the down-navigation button to change the polarity to minus (–), as shown
below.
Infeed Photo Eye Input
Note, if your photo eye were wired to Input 3 (or any other Input between 1 and 6), this
menu would be used to make the change. For a positive polarity on Input 3, for
example, you would enter "+3" in this input screen.
10) Press the Go button to save your setting and exit the input screen.

Selecting the Correct Photo Registration for Rejects

If you are using a photo eye to control your reject device, this function allows you to do
the following.
• Make accurate and consistent rejects using a variety of reject devices—such as
drop-nose, retracting-belt, air-pusher, and air-reject systems.
• Make accurate and consistent rejects, even when the gaps between your
individual units of product varies.
This function is particularly useful if you are inspecting packages that exceed six inches
in length. (Here "length" means that, as the front end of the package enters the search
head, the distance to its trailing edge is six inches or more.) When testing products
longer than six inches, using a photo eye (and the appropriate parameters for the
photo-registration function) allows you to accurately reject contaminated products—
Page 32 Thermo Scientific APEX User's Guide