Varied metal detectors in the nature of work being done, according to several things give them an advantage for the rest of the other detectors, as excellence minerals and sensitivity and depth …. etc.. As a result of these features, we find clear difference in the prices of metal detectors, and in this article will learn about these types of detectors and the ability to discover the treasures in the ground.
Universal device .
Depending on the level of service and price can be divided into metal detectors for beginners, middle-class metal detectors and metal detectors are computerized .
metal detectors for beginners
Devices for beginners are designed primarily to address the simple search tasks . It is usually dynamic embodiments TR / VLF, i.e. metal detectors, requiring continuous motion search head . The signal occurs only when the head moves over the object. If you head over to stop the metal , the signal disappears.
Dynamic principle has its benefits :
– Automatic tuning out from the “middle” of soil;
– A very simple setting , carried out under a ” plug and go “;
– A simple circuit design , leading to cheaper and high reliability device .
The disadvantages are:
– Reduction of sensitivity compared with static devices ;
– Inaccurate localization of the object;
– Reducing the sensitivity or the appearance of false positives when searching for “difficult” soils (“black sand “, ” hot rocks “, etc.) .
Discrimination garbage simple dynamic devices is different from the static . Their controls usually consist of 1-3 knobs : Volume, sensitivity and the level of discrimination. Some of them may be absent, then is immediately set to the maximum (or minimum for the level of discrimination) . The search method such devices provides continuous scanning of the ground vibrational motions at a speed of about 30 cm / s.
The most popular metal detectors in this group : AMIGO II, CUTLASS II, CUTLASS II MAX company TESORO, IMPERIAL – 500A company RODONIT , FREEDOM ACE PLUS, TRESURE ACE 100 , TRESURE ACE 200 from GARRETT, CLASSIC I , CLASSIC I SL, CLASSIC II, CLASSIC II SL company WHITES, FISHER 1212- X company FISHER, Tracker-IV company Bounty Hunter.
INSTRUMENTS OF MIDDLE CLASS .
Have both static and dynamic modes , although the metal detectors 70 and 80 years were more likely to purely static.
These devices are characterized by high sensitivity and good resolution . They can be equipped with several interchangeable search heads of various diameters (sometimes oval ) . The number of controls comes to 8 , the procedure of setting requires some skill and lasts several minutes. For example , hand ground balancing is to achieve rotation of the corresponding control signal at the same initial raised and lowered to the ground head. Discrimination nation in such devices are usually multi with a search of all metals (All Metal). Management completed a quick adjustment button in the handle or on the body. These instruments have not yet microprocessors – hence the abundance of controls .
The most popular metal detectors in this group : CS-2MX, CS-5MX, CS-1220XD company C.SOPE, BANDODO II, BANDODO II uMAX, SILVER SABRE II, SILVER SABRE uMAX, GOLDEN SABRE II , TOLTEC II company TESORO, CLASSIC III SL company WHITES, FISHER 1225 -X, FISHER 1235 -X, FISHER 1266 -X, FISHERCZ- 5 QUICKSILVER, 5900/DL company FISHER and 6000/Di PRO SL company WHITES, Sidewinder uMAX firm Tesoro , CZ- 6 FISHER firms , etc.
Computerized device .
Computerized metal detectors take the so-called decision on the nature of the findings . It is possible , by using the circuit of the instrument microprocessor.
Distinctive features of the computerized devices is the presence of a liquid crystal display (or dial gauge ) and a minimum number of touch keys to enter the program . Under the program refers to the set of states of a virtual ( not retired on the front panel) controls. Adjusting these controls by means of the screen and a few buttons. In memory of the device , most often incorporated several programs to look in different environments : on the beach, in the park, buildings, etc. When searching for a similar device for each finds measured amplitude and phase characteristics , which allows for the classification of findings . Most metal detectors also carry out classification , giving the screen or on the dial indicator result. Shades of the measured parameter ranges from 8 to 190, which allows you to choose and implement its own program memory of the device , just enough for your needs when you search for specific terms. So you can install any scheme of discrimination unwanted finds at your request .
In the case of finding coins or other small items the unit automatically determines the depth of the findings , show the depth of the screen and can even simulate voice to announce the depth in inches (instrument Grand Master Hunter CX III).
Settings such as the detuning from the ground (ground balance) are automatic , and the sensitivity , volume , etc. can be set as desired.
The most popular metal detectors in this group : CS-8SSY firm C.SOPE, FISHER CZ-7a, ULTRA GTA 400 , ULTRA GTAx 500 , ULTRA GTAx 100 , GRAND MASTER HUNTER CX, GRAND MASTER HUNTER CX II, GRAND MASTER HUNTER CX III, GTI 1500 , GTI 2000 by GARRETT, SOVEREIGN XS- 2 firms MINELAB, CLASSIC ID SL, CLASSIC IDX SL, QUANTUM II, QUANTUM XT, S SPECTRUM XLT, Silver Eagle, Eagle Spectrum company WHITES, FT 17000 and 18000 FT company MINELAB, CS-4ZX and CS-5ZX firmC.SOPE.
Downhole instrument .
Deep metal detectors to search for large objects ( large object is a surface area of over 400 square meters. Cm) manufactured by all the major U.S. firms .
Increasing the depth in all devices is the diversity of transmitting and receiving coils ( flat ) in the space . The coils are made of two exploratory head rigidly connected to one another post. Thus one reel in the working position of the device is parallel to the ground surface , the other perpendicularly. Dimensions of coils around 25×40 cm One of the coils emits electromagnetic waves with a frequency of 12 – 107 kHz , the other receives the reflected signal.
The search method such devices is different from universal search SINGLE metal detectors and has a few features :
a) Scanning soil is not oscillatory movements of the search head as close to the ground , and zipped the device parallel to the ground , covering a strip of equal width coil (about 25 cm). And so the band for the band . In this case, the coil does not need to zoom in to the ground .
b ) These metal detectors can not be checked in the room , especially at home , because of the reflection of electromagnetic waves from the walls , and utensils.
c) instruments work well on the ground , but if you dig a trench in search of treasure , the reflections from the walls create false signals . In this case, you should go to the single head unit.
d) In contrast to the universal SINGLE instruments underlying metal detectors do not react to small objects in shallow water , so the small metal garbage does not prevent the search.
d ) The deep metal detectors do not distinguish between metals .
The most popular metal detectors in this group : ANALOG SYSTEM 104 -B, GARRETT DEPTH MULTIPLIER, FISHER GEMINI- 3 , WHITES TM 808 , TF 900firmy Discovery, 2B Mega Explorer , etc.
DIVING EQUIPMENT .
Underwater devices are those that can withstand dive to great depths (up to 250 feet, which is about 90 m ), and are able to eliminate the influence of salt or fresh water as a search environment . It should be noted that almost all of the above metal detectors are sealed search head , allowing you to immerse them in water to a depth rod length and search the shallow waters , but nevertheless, it is not possible to classify the instrument as an underwater .
Most underwater devices used pulse induction principle , which significantly reduces the effects of water , damp and wet soils as a conductive medium to search . Devices in this class are automatically adjusted to changes in environmental conditions ( salinity of the soil, salinity , etc.). Available in various modifications pulse devices , some of which are not designed for deep dives. Depth pulse detection device ( not only underwater ) are usually longer than TR / VLF. These metal detectors do not require manual tuning , however, the distinction between metals they are not always accurate . Of course, all the underwater metal detectors may be used for research on the air.
The most popular metal detectors in this group : FISHER IMPULSE, FISHER 1280 -X AQUANAUT, JWFISHERS PULSE 8X, CZ- 20 Quicksilver firm FISHER, SEA HUNTER XL- 500 company GARRETT, PIRANHA firm TEROSO, SURFMASTER II, SURFMASTER PI, PI 3000 the company WHITES, Stingray II firms Teroso, Excalibur company Minelab , etc.
Specialized equipment for search native gold
Worthy of its own solutions is a task of finding gold nuggets . The fact that the detection of gold universal TR / VLF devices , fine particles of metal can be adopted for the device pellet ferrous metals are not detected . Besides gold output is often accompanied by a “black sand ” containing magnetite, as well as a strong ground mineralization . To overcome these effects increases with the operating frequency of 2 – 7 kHz ( with universal devices ) to 18-70 kHz ( from specialized to search for gold) and the use of elliptic search heads.
Became widely known modified pulse metal detectors, allowing very efficiently search for small gold items or parts thereof on the beaches and shallow waters in the surf zone .
The most popular metal detectors in this group : FISHER GOLD BUG II firms FISHER, SCORPION GOLD STINGER firm GARRETT, DIABLO uMAX, LOBO SUPER TRAQ firm TESORO, GOLDMASTER IIV / SAT, GOLDMASTER 3 , GOLDMASTER 4 / B company WHITES, SD 2100 , SD 2200 , Eldorado MKII company Minelab , etc.
Metal detector to search for underground communications.
These special metal detectors are usually designed for a specific task whose execution by means of conventional devices is difficult or impossible. Used to search for pipes, cables and other underground utilities . This may also include magnetometers to find iron. Their principle of operation is somewhat different from the induction metal detectors. Among the special devices include magnetometers to find iron. Their principle of operation is somewhat different from the induction metal detectors. They are also capable of detecting large masses of metal at a great depth , and to help in the search for ore containing minerals. The most popular metal detectors in this group : FISHER TW- 6 , FISHER TW- 770 , M- 65 , M- 95 , M- 100 , FX- 3 firms Fisher, PCL 500 firms Whites , etc.
Metal detectors for security services .
Security metal detectors can be divided into hand-held metal detectors Inspection , stationary detectors and metal detectors to check (Walk through metal detectors) .
Hand-held metal detectors Inspection designed to find hidden under clothing or in luggage weapons and other prohibited items . They usually consist of a handle , which is rigidly attached to the search coil . Terms of use require a minimum of controls, so also they have not the power switch more than one switch (level of sensitivity or discrimination) . Examples : Body Scanner Companies Ranger, Super Scanner firm Garrett, Auto-Scan Company Whites.
Stationary detectors – arch structures to skip the people while controlling the hidden metal. Sometimes these designs are disguised as doorways, sometimes made in the form of cabins and vestibules , but more often it is a U-shaped frame with a sound and light indication . Firms producing arched metal detectors, they usually offer different types :
a) a simple single-band device to control the availability of weapons , and they are usually self-powered and easy to transport , the range of use – securing temporary facilities and activities : exhibitions, competitions , concerts , etc. , Example : Magnascanner 5000 Company Garrett, Metor 120 firm Metorex ( Finland) .
b) highly sensitive devices with multiple zones of control, independent adjustment of sensitivity zones , the ability to connect the remote control to control the flow of people , these devices are commonly used microprocessors , examples : Intelliscan 9000 , Intelliscan 12,000 firms Ranger, Metor 200 Companies Metorex.
c) metal detectors for extreme conditions : cold-resistant internally heated , protected from deliberate destruction and vandalism ( armored ) , examples : Metor 120 WP firm Metorex, Magnascanner 3000 the firm Garrett.
Arched metal detectors are usually built on the principle of PI ( pulse induction ) as rarely a need to distinguish between metals . These metal detectors are set or control of any metal in any quantity ( jewelry factories , prisons , etc.) or for the detection of the corresponding mass ( volume ) of the metal at the control on bringing weapons.
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