Vlf metal detectors

Vlf metal detectors In the category treasure hunting more articles and learn more information about Vlf metal detectors Reviews Price Specifications Features Image manuals videos Accessories All this in metal detectors for gold.

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Vlf metal detectors


On this site you will find several intended items intended for novice prospectors.


Vlf metal detectors

The frequencies used by VLF (very low frequency ) metal detectors are less than 100 kHz. Their sensing head consists of two coils, a transmitter and a receiver. This unit can theoretically discriminate metallic objects on the basis of their composition, but in practice it is reliable to distinguish between ferrous and non-ferrous metals if the latter are not being buried deeply too. The frequency is very important:


a metal detector low frequencies (4 kHz/8 kHz) will be more sensitive to the big currencies and large objects and less sensitive to the effects of soil, so that a high frequency (12 kHz/18 kHz) will be more sensitive to small coins and small metal objects. Therefore, depending on the targets that you will search, be careful to choose a device with a suitable frequency.
Pulse induction metal detectors


the pulse induction metal detector requires that an individual coil or issuing or receiving. The pulse induction are more powerful than the VLF. They detect in highly mineralized ground a small currency (10 mm) approximately 25 cm and a big currency (30 mm) to 50 cm. The big interest of a PI is that it doesn’t lose power in mineralized ground. However the FT may not discriminate against small ferrous. They can just to identify the ferrous wholesale in the first centimetres through the introduction of a magnetometer in the sensor head. Indeed, a magnetometer is only sensitive to the iron, so if the PI and the magnetometer sound, is that the target is iron. You therefore require to detect all ferrous small, which can prove very difficult even impossible on areas contaminated as for example around a former dwelling.
The metal discrimination


Some metals are better conductors (including money) and frequency offset will be all the greater. It is by studying this frequency shift that can attempt to discriminate the detected object. But on the ground, it is different. Indeed, discrimination is disrupted by strong mineralization and the depth of the metal target and also by the phenomenon of masking. When you people on a sector with strong mineralization and many small ferrous, dig on small ferrous signals in detection limit, you will be surprised because once you have removed a few centimetres of soil, the risk sounds of is improved and you might discover a small non-ferrous object.

Council to prospectors for the choice of the device


Take a low range of a recognized brand device, you should be able to find 200 / 300 euros. Avoid those whose selling price is ridiculous, they will not make a serious exploration. Choose a lightweight device (1.2 kg / 1.4 kg). Do not focus on the pure power of a device, as with the practice you will find that the majority of the finds are terrain totally ferrous, and on this type of terrain it is necessary instead to reduce the power to make findings. In my opinion the best brands at the moment are XP, minelab and tesoro. To detect in mineralized ground and small ferrous totally, the best in this difficult exercise are the deus and the gold maxx power of XP. For detection on the beaches the minelab FBS (sovereign, excalibur) are the most efficient. For la billebaude prospecting, the tesoro seem the most suitable due to their elaboration of the ferrous ‘without a head’. Your drive must be close to the ground. Use a protects disk to protect your head. Need to clarify that protects it head is used not only for the transport of the device but also and especially during the meeting of prospecting to protect the discs from shock.

The cleaning of metals


It is often at this stage that beginners commetent of irreversible errors. I had more time or I met a beginner prospector who came to detect a superb Roman bronze coins just hours after buying his metal detector, and that he had irreparably simply remove any value collection, cleaning it with a chemical that had damaged the patina of the metal trigger what is called “bronze disease”. This disease will literally eat away the currency.

Vlf metal detectors

Ancient coins advertising the pricier in world

Vlf metal detectors


-L’ Silver and gold

Gold does not, oxidizing it did need to be cleaned. The money goes to cover with a black patina time. This patina has no collection value. so, you can remove using a solution of acid such as vinegar or lemon juice. Then be sure to soak the currency a few hours in a basidium as baking soda solution to cancel the effects of the acidity that could damage term metal.

-The bronze and copper

Chemical cleaning is prohibited. Usually this type of currency are covered with a layer of Earth melee to metal concretions. The gangue is not too hard, a simple tip wood may be sufficient if you have to use a metal needle whose it will be previously blunt tip to avoid scratching the patina. Long hours of work will be needed. A binocular magnifying glass will be a valuable help for stoper cleaning as soon as reached patina layer.
Glossary of detection
-Dynamic: sensor require a movement of the disk detection in order to detect metal.
-Static: sensor requiring no movement of the disk detection to detect metal.
-Ground effect: setting to make the device less susceptible to mineralization of soil.
-Mineralization: containing metal particles making the metal detector unstable ground.
-Masking: Ferrous target preventing the device to detect a target non-ferrous House a few centimetres of distance.
-Sensitivity: setting to increase or reduce the power of the appliance.
-discrimination: adjustment to eliminate certain targets according to their metallic nature.