Setting Multi-Zone Detection - Thermo Scientific APEX 100 User Manual

2) Press the Go button and an input screen appears.
Detect Level
3) Key in a new setting for the detect level.
4) Press the Go button to save your setting.
5) Press the Back button to exit the menu.

Setting Multi-Zone Detection

Typically, when a metallic contaminant passes through the search head, it produces a
signal having a positive peak followed by a negative peak (because the metal passes
through the two opposing search (or input) coils located in the search head. When the
detector analyzes this signal from the search head, it looks for two peaks (one positive,
the other negative). Only when two peaks are detected will the APEX "tag" this as
contamination by sending a signal to the reject device. This "two peaks to verify
contamination" set-up is the default, multi-zone setting. In the figure below, the check
mark by the letters, MZ, indicates the APEX is currently using multi-zone (two peak)
detection.
MultiZone Detection
Enabling One-Peak Detection
This function is typically used in applications running large cases of product that fill 80–
90 percent of the search head. To enable one-peak detection, do the following.
1) To allow the detector to tag contamination using only one peak, press the Go button
and an X appears next to the letters, MZ.
2) Press the Back button to save this "one peak to verify contamination" setting and
exit the menu.
Thermo Scientific APEX User's Guide Page 165