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Metal Detectors

Supplier: Web Tech AutoWeigh

Web-Tech's model "MDX-1" Metal Detection provides a reliable, versatile and cost effective solution to the problem associated with tramp metal in a material stream.


The system comprises a transmitter and dual detection coil assembly, sandwiched in fibreglass. A microprocessor based electronics module combines with the coil assemblies to form a reliable and dependable system that performs where others fail. Process trip and marker control outputs are standard.

Detection Method:

Designed for normal mining, quarrying and tertiary processing applications, the "MDX-1" utilises dual channel pulsed eddy current technology. This unique approach allows for a form of signature analysis to be performed on the tramp signal, thus helping to prevent “phantom” trips.

To provide the highest sensitivity and still retain stability, the detector uses a very low excitation frequency to the generator coil. This method avoids much of the induced "noise" from non-metallic variations of the product stream. As metal passes through the detector coils, the eddy current losses created by the tramp metal cause the detector coil to be loaded.

This dampens the oscillations of the transmitter signal. A simple voltage level detector is DC coupled to a low pass filter and amplifier, which process the minute variations in field strength.

The gain of the filter amplifier block is adjustable, and a unique offset control is provided to suppress the signal, relative to the programmed "trip" level. This allows high sensitivity to be used in the presence of normal process "noise" signals.

Precise selection of filter and coupling characteristics have provided this detector with inherently high response to tramp metal, and a corresponding high rejection of cyclic "noise".

Electronics Features

The "MDX-1" electronics is supplied in an IP66 reinforced fibreglass enclosure, and incorporates integral keypad for all programming. All information is displayed on a backlit LCD display.

Programming is in simple "English", in a menu based system. Standard features include sensitivity and offset adjustment, bar graph indication of metal signs timed output, diagnostic facilities, "coast" counter for multi trips, and "real" time history of detects trips.

Detector Coils:

Detector coils are supported by means of fibreglass support structure with "swing away feature for oversized burden. Detector coils a fabricated to suit any conveyor width and conveyor profile.

Marker Systems

The "MDX-1" can be supplied with optional burden marking systems including "flag" and "spray" types.