Thermo Scientific DSP2 Installation And Operation Manual page 36

Learning the Product
Press the Learn hard key, then press the Start Learn button and run the product through the detector. Note: the product must
turn on the green Product Light in order for the Phase Point to be learned. A red Product Light indicates excessive product
signal and the gain should be reduced. If the product does not turn on the green Product Light you must set the thresholds.
Path: Configure/Learn/Special/Thresholds.
The mode and phase will be learned in one or two passes of the product. Residual, if enabled, will take a single pass of product.
Sensitivity takes four product passes.
Dry Products
Dry products will typically phase near 90°. Some dry products may not produce enough product effect for the system to learn.
In these cases, after initiating the Start Learn, press on the top of the search head until the Product Light turns green. This
should produce a standard dry Phase Point near 90°.
Wet Products
Wet products will typically phase near 0° but can vary by ±20°. It is advisable to use automatic phase when inspecting discrete
wet products. In doing this, the detector will automatically track product phase changes caused by temperature or ingredient mix
changes. To select auto phase press Configure Learn, then Phase, then Auto. When using auto phase it is advisable to limit
the phase range. This can be done under Special in the Phase menu.
Special
Head Gain
Head gain selects high or low gain setting. High gain should be used in all applications unless the product effect is too high and
turns on the red (high) Product Light. If this is the case low gain should be selected. Whenever the head gain is changed it will
affect the overall sensitivity of the detector and therefore the sensitivity should be tested and recalibrated if necessary.
Thresholds
The system maintains two independent thresholds: the conductive threshold and the magnetic threshold. These thresholds
depend on external factors such as the installation environment and the type of product being inspected. This menu is used to
set these thresholds. The standard threshold values are 100 for both. This should be fine for most installations.
NOTE: With NO product running (and the conveyor running, if present) the Product Light should be off and the LED Meter
should be green. In applications where the Product Light is On when no product is present, the thresholds should be learned or
manually adjusted so that the product light only comes on when product is passing through the search head. The threshold
should also be learned or adjusted in cases where the product is failing to turn on the Product Light. The detector uses the
Product Light and therefore, these threshold settings to determine when to learn or update its Phase Point.
Phase Special
Phase Limits
Phase limits are used to limit the range of the Phase Point in automatic or learn phase operations. To set the limits use the
Spread Limits option. This adds ±1° every time the button is pressed. For a wet product in Auto Phase it is recommended to
have phase limits set at ±10-15° from the Phase Point.
Trigger
Trigger indicates a level at which the detector will initiate a Fast Phase when the unit is running in Auto Phase.
Phase Angle
This allows for manual adjustment of the Phase Point.
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