Loma IQ2 Service Manual page 68

The compensation and threshold values are automatically set by the detector,
during a calibration cycle, but can be altered manually if so desired. The top
menu position on the display shows the product signal level against the
threshold.
Working Modes of Operation
There are three working modes of operation, Resistive, Reactive and Dry.
Generally speaking, Dry mode is used for products with little or no product
effect, due to their negligible conductivity.
Reactive mode is used for products with considerable moisture content where
the water can conduct, thereby leading to considerable R signals (large product
effect). Resistive working is limited to those products with a little moisture
content, such that they have sufficient product effect so as not to allow them to
work dry, but that the R signal is not large enough to let them work reactively.
As examples of working modes, tea and coffee would work Dry because of their
low moisture content. Frozen foods will also work Dry, because water cannot
conduct when it is frozen. Cheese, fresh meat, hot bread will work Reactively,
because of the conductive moisture content. Resistive working only applies to a
few products, such as dry ones with iron fortification, or bulky products with a
slight moisture content (flour).
Module 7026
Figure 7 Locus plot after compensation applied
Configuration and Set up Information
S
Threshold
Cheese
Cheese
+
2mm Fe
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