Changing Material Code To Adjust Sensitivity; Testing For Coil Or Junction Box Damage - Thermo Scientific Ramsey Oretronic IV User Manual

If your TMD IV is passing tramp undetected, use the procedures in this section to help determine the cause.
The procedures are written with an assumption that the reader is familiar with the TMD IV operator interface.
If you are not, please familiarize yourself with the Operating the TMD IV section of this manual before
beginning any of these procedures.

Changing Material Code to Adjust Sensitivity

Detecting small-sized tramp metal, especially small stainless steel tramp may require changing the material
type code used by the TMD IV. This may not result in a dramatic sensitivity increase because a reduction of
1/2 in tramp size may result in a reduction of only 1/4 to 1/6 of the signal; the signal reduction is a function of
size and type.
First, you must determine how well the TMD IV is working with the current material type code (which defaults
to 3).
1. Balance the coils using the procedure in Correcting Coil.
2. Under the Calibration menu, bring up the Coil Balance screen and observe the bar graph
3. Increase both Coarse and Fine sensitivity values until the bar graph covers 75% of the screen in the Coil
Balance display. This may require a number of cycles of changing and observing.
4. When the bar graph covers 75% of the screen, record the Coarse and Fine sensitivity values.
5. Navigate to the Settings screen, and change the Material Code selection to 1.
6. Balance the coils again using the procedure in Correcting Coil Imbalance.
7. Navigate to Coarse Sensitivity screen in the Calibration menu and enter the value recorded in Step 4.
8. Navigate to the Fine Sensitivity screen in the Calibration menu and enter the value recorded in Step 4.
9. Navigate to the Coil Balance screen in the Calibration menu and observe the bar graph. If the bar
graph covers less than 75% of the screen, the TMD IV is operating properly at this material code, and
the sensitivity will be greater than it was with the previous material code.
NOTE: The lower the material code, the greater the sensitivity to conductive materials other than
tramp metal. In most instances, this will not be a problem; if a problem should occur, refer to the
process for Adjusting for High Product Noise (Mineral Ores). If the bar graph covers more than 75% of
the screen, the TMD IV may still function properly at this material code setting.
10. Perform an auto-calibration for the coarse and fine metal sensitivity, as described in section "Initial
Setup Procedure" and test the system to see if it trips on tramp correctly.
11. If still greater sensitivity is required, repeat this procedure until you have the sensitivity you need.

Testing for Coil or Junction Box Damage

If you suspect that coil or junction box may be causing the TMD IV to operate improperly, follow the
procedures in this section to test for damage.
These procedures involve testing wiring on the CPU (and in the junction box, if one is used on your system)
using an ohmmeter.
WARNING. Do not attempt to defeat safety interlocks provided with this product. There are no
user-serviceable parts inside the system enclosure. This product must be serviced only by authorized
Thermo Fisher Scientific service personnel.
Ramsey Oretronic IV Tramp Metal Detector REC 4479C Page 52