In detail: do-it-yourself metal detector repair from a real master for the site my.housecope.com.
Metal detector coils play an essential role in finding valuable finds, but with intense work, impacts on rocks and pieces of soil can leave a sad imprint on the coil design, which often leads to its replacement. Before spending money on a new coil, you can figure out what happened and try to repair the coil with your own hands.
Before interfering with the coil mechanism, check if it is still under warranty. The average warranty period for coils is about a year, therefore, in case of a breakdown within the first months after using the metal detector, you should contact an authorized service center, where the coil will be repaired free of charge. If you have been using (and quite successfully) the coil for more than a year, and there was a problem with it, you can try to repair it yourself.
First of all, you need to determine if the coil has really fallen into disrepair. Malfunctioning behavior during operation is a symptom of a malfunction. This is "dulling", and sometimes a complete refusal of the detector to fulfill its duties. The coil starts to squeak at the most inopportune moment, shows an increased or zero index, in general, behaves inadequately. Most often, on such a coil, you can find numerous chips, scratches, and cracks. It can also happen that something inside the coil seems to have fallen off. This may be due to the fact that the rubber seals holding the coil are worn out and no longer perform their function. The coil crawls along the body and, naturally, there can be no question of any sensitivity in this situation.
Video (click to play).
First you need to prepare well - dry the coil for several hours, prepare the necessary tool. You will need:
Sharp knife
Epoxy (when choosing, pay attention to the color, it is advisable to choose a shade that matches the color of the coil)
Putty knife
Flat surface for mixing glue
Sandpaper
This is how a well-served coil looks like - it has a lot of cracks and chips
Expand the cracks carefully with a knife. Mix both of the epoxy kit (resin and hardener) on a flat surface using a plank or discarded plate. Apply the resulting composition to the cracks of the coil, sparing no glue - the remnants can be cut off later. Now you need to wait for the epoxy to dry, which usually takes about a day. After the glue is completely dry, sand the spool body starting with the coarser structure. This will remove any unevenness from the adhesive.
In this way, you can return the coil to almost its original appearance, as well as protect it from further destruction.
As we already mentioned, the coil can simply stop working. If visually everything is in order with the case, only a professional can determine the reasons for the failure of the sensor. But if you clearly feel that something is rattling inside the coil (which should ideally not be), you can try to fix it yourself.
Most often, the seam is fused; you will have to carefully cut it along its entire length with a sharp knife.
Open the spool carefully without touching the wires.
If there is something rumble inside the coil, then you will see that the rubber seals have worn off, have ceased to hold the coil.
Attach the spool with glue or double-sided tape to the top of the case, remove the protective film if using tape. Glue the body with a good glue, such as a car glue.
If you are using double-sided tape, be sure to check its specifications. There are models of scotch tape that can withstand temperatures from -30 to +145 degrees, but you can mistakenly choose the wrong type that can only be operated at positive temperatures. With this option, your coil will not last long, and you will have to start all over again.
We told you how to repair a metal detector coil with your own hands, saving a decent amount of money, which you can spend on additional accessories.
A device that allows you to find metal objects located in a neutral environment, for example, soil, due to their conductivity is called a metal detector (metal detector). This device allows you to find metal objects in various environments, including the human body.
Metal detector X-Terra 305.
Largely due to the development of microelectronics, metal detectors, which are produced by many enterprises around the world, have high reliability and small overall and weight characteristics.
The work of a sapper with a metal detector
Not so long ago, such devices could most often be seen at sappers, but now they are used by rescuers, treasure hunters, utility workers when searching for pipes, cables, etc. Moreover, many "treasure hunters" use metal detectors that they collect with their own hands ...
The metal detectors on the market work on different principles. Many believe that they use the principle of pulsed echo or radar. Their difference from locators lies in the fact that the transmitted and received signals operate constantly and simultaneously, in addition to everything else, they work at coinciding frequencies.
The principle of operation of a metal detector
Devices operating on the "receive-transmit" principle register the reflected (re-emitted) signal from a metal object. This signal appears due to the effect on a metal object of an alternating magnetic field, which is generated by the metal detector coils. That is, the design of devices of this type provides for the presence of two coils, the first is transmitting, the second is receiving.
Devices of this class have the following advantages:
simplicity of design;
great opportunities for the detection of metallic materials.
At the same time, metal detectors of this class have certain disadvantages:
metal detectors can be sensitive to the composition of the ground in which they are searching for metal objects.
technological difficulties in the manufacture of the product.
In other words, devices of this type must be configured by hand before work.
Other devices are sometimes referred to as a beat detector. This name came from the distant past, more precisely from the times when superheterodyne receivers were widely used. Beating is a phenomenon that becomes noticeable when two signals with similar frequencies and equal amplitudes are added together. The beating consists in the pulsation of the amplitude of the summed signal.
