Thermo Scientific APEX 100 User Manual page 410

Calibrate X and R Noise
Thresholds
This calibration establishes a noise baseline
for the detector, and must be done with the
conveyor running and no product present in
the search head.
1) Make sure the Main Menu is displayed.
2) Highlight the frequency and gain menu.
3) Press the Go button.
4) Navigate to page 2 of the menu.
5) Navigate to the "Calibrate Noise Thres-
holds" menu. (Note: The background of
the calibrate function should now be
highlighted in black, as shown below.)
Calibrate Noise Thresholds
6) Press the Go button and a monitor screen
appears. The calibration is complete when
the screen above reappears showing the
calibrated values for the X and R
thresholds. Typical values for these
thresholds are as follows.
• X threshold < 300
• R threshold < 100
Full-Product Calibration
A full-product calibration allows the detector
to learn how to identify your uncontaminated
product, and sets the following basic para-
meters for your product.
• Phase-angle setting
• Detection level
1) Make sure the product name is highlighted
in the Main Menu.
2) Press the Go button and the "Full Product
Calibration" function is automatically high-
lighted.
Full Product Calibration
Thermo Scientific APEX Quick-Start Guide
REC-F-58E—Part #085555
3) Make sure the conveyor is running and
uncontaminated product is passing
through the search head.
4) Press the Go button and a monitor screen
appears. During the calibration process a
series of frequency/gain mini-screens may
appear, which halts the calibration process
as the detector searches for the optimum
frequency/gain settings for your product.
When this occurs, press the Go button to
restart the calibration process. The Main
Menu screen is displayed when the
calibration is complete.
Gravity-Feed
Applications
Listed below are the most commonly used
functions for setting up a typical gravity-feed
application.
Reject-Delay Time
This function is usually set to 0.00 seconds,
and tells the gate to close immediately when
contaminants are detected. If your gate is a
long way from the search head, you may
need to set a longer delay time.
1) Make sure the Main Menu is displayed.
2) Navigate to the rejects menu.
3) Press the Go button.
4) On page 1 of the rejects menu, highlight
the "Reject 1 Distance/Delay" function.
Reject 1 Distance/Delay
5) Press the Go button and an input screen
appears.
6) Key in an appropriate value (in seconds
and hundredths of a second) for the
reject-delay time.
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