Metal Detectors

Frequently Asked Questions

What is metal detector, what is gold detector?

A metal detector is an electronic instrument which detects the presence of metal nearby. Metal detectors are useful for finding metal inclusions hidden within objects, or metal objects buried underground. They often consist of a handheld unit with a sensor probe which can be swept over the ground or other objects. If the sensor comes near a piece of metal this is indicated by a changing tone in earphones, or a needle moving on an indicator. Usually the device gives some indication of distance; the closer the metal is, the higher the tone in the earphone or the higher the needle goes. A gold detector has special functions which can do gold prospecting.

How it is working?

Metal detectors work by transmitting an electromagnetic field from the search coil into the ground. Any metal objects (targets) within the electromagnetic field will become energised and retransmit an electromagnetic field of their own. The detector’s search coil receives the retransmitted field and alerts the user by producing a target response. Metal detectors are capable of discriminating between different target types and can be set to ignore unwanted targets.

1. Battery The battery provides power to the detector.

2. Control Box The control box contains the detector’s electronics. This is where the transmit signal is generated and the receive signal is processed and converted into a target response.

3. Search Coil The detector’s search coil transmits the electromagnetic field into the ground and receives the return electromagnetic field from a target.

4. Transmit Electromagnetic Field (visual representation only - blue) The transmit electromagnetic field energises targets to enable them to be detected.

5. Target A target is any metal object that can be detected by a metal detector. In this example, the detected target is treasure, which is a good (accepted) target.

6. Unwanted Target Unwanted targets are generally ferrous (attracted to a magnet), such as nails, but can also be non-ferrous, such as bottle tops. If the metal detector is set to reject unwanted targets then a target response will not be produced for those targets.

7. Receive Electromagnetic Field (visual representation only - yellow) The receive electromagnetic field is generated from energised targets and is received by the search coil.

8. Target Response (visual representation only - green) When a good (accepted) target is detected the metal detector will produce an audible response, such as a beep or change in tone. Many detectors also provide a visual display of target information.

How deep can my detector reach under the ground?

This is the most common question of the detector owners. However this is the most difficult question because depth of the detector depends on many factors like the dimensions and age of the object, the ground conditions etc.

Ground Mineralisation A target in low mineralised ground can be detected deeper than a target in highly mineralised ground. The level of ground mineralisation has a significant influence on detection depth.

Target Size Large targets can be detected deeper than small targets.

Target Shape Circular shapes like coins and rings can be detected deeper than long thin shapes like nails.

Target Orientation A horizontal coin (e.g. lying flat) can be detected deeper than a vertical coin (e.g. on edge).

Target Material High conductive metals (e.g. silver) can be detected deeper than low conductive metals (e.g. lead).

Does my detector make the discrimination?

Several detectors on the market can make a discrimination in a simple way. However it is very important that you should not to overlook some valuable mines while trying to separate them from the worthless ones. The detectors, due to the unique Technologies, make more clearly discrimination while descends a lot more deeper than the other detectors and continue to find valuable objects.

Does the large coil increase the depth?

Large search coils increase the depth capacitiy with certain percentages. However the point needs to be known is that the large search coil while searching deeper can not see several small objects on the surface.

Is there any benefit of the detector warranty?

One of the most important points to be considered is, whether the detector is under warranty or not. It should be noted that in some detectors may occur defects as in any other electronic instruments. Depar guarantees 2 years service and spare parts to all of the detectors that has sold. Especially people who is thinking to buy 2’nd hand detector should not ignore it. Depar Ltd. Sti. guarantees long service life and appropriate priced spare parts in TSE certified service about all of the detectors that has sold.

Why the prices are different while all of the detectors are a like?

The detectors are alike but their technologies are different. Like all the other goods the product features vary with the price in the right proportion at the detectors as well. The detector prices vary according to their features and the technologies they are using. To give an example, Like DVT (Dual Voltage Technology), FBS (28different frequencies), BBS (17 multiple frequencies), MPS (Multi-Period Sensing) Technologies that Minelab uses are the patented Technologies appeared as a result of long- term research and development. The usage rights of these Technologies belongs only to Minelab and can not be used in any other brand detectors.

The frequency sent by the detector; The frequencies (kHz) that the detectors send to the underground are measured in kiloherz. The lower the value of the frequency in kHz penetrates the deeper of the signal. The higher of the frequency value increases the sensitivity of the small objects (single coil) on the surface. To give an example, Minelab detectors produce the low frequency 1,5 kHz so that no other manufacturers on the world can produce. And again Minelab detectors produce the high frequency 100 kHz so that no other manufacturers on the world can produce.

What is Multi-frequency (FBS, BBS)?

The Minelab detectors have the multi-frequency FBS, BBS Technologies that can send 28 or 17 pieces multi-frequencies from 1,5kHz up to the 100 kHz to the underground simultaneously. This is the patented Technologiy of Minelab and can not be used in any other detectors. The surface scanning and the deep scanning which can not be made by any other detectors are made simultaneously through multi-frequency. To give an example, 28 detectors seem working with FBSsimultaneously, 17 detectors seem working with BBS on the field.