Generally metal detector is divided into two classes by coil format of head. One is closed coil type and the other is separate coil type.
Seperate Coil Type Closed Coil Type
A comparative table
section |
Seperate Coil Type |
Closed Coil Type |
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Sensitivity |
Guaranteed sensitivity standard is at bottom of tunnel for avoiding the bad sensitivity. |
Every position inside tunnel has even sensitivity. Guaranteed sensitivity standard is at center of tunnel even if the position has low sensitivity. |
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Vibration |
Upper panel and bottom panel are separate. So the detector is affected by circumferential noise easily. It has the detector make a mistake. |
Upper panel and bottom panel are not separated. So the head is very strong against circumferential noise. |
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Compansation |
The periodical compensation is required. |
The machine compensate by itself. So the periodical compensation is not required. |
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Production target |
Productivity - productivity is high because the producing process is simple. |
Stability - the great technical Know-How is required. Producing process is difficult. |