Accessories

UNIVERSAL CABLE COIL 4 M PERIMETER

This search coil is identical with the 1 m x 1 m frame coil described before, but it is supplied without a frame. Therefore a self made metal free frame has to be built first, before mounting the same cable on it. This coil should only be laid out with a single winding.

UNIVERSAL CABLE COIL 8 M PERIMETER

This extremely lightweight and easy to transport universal cable offers a variety of different search coils for different search applications. The cable coil has to be fixed with tape on a frame which can be made of PVC-tubes for example. The following search coil configurations are mainly useful for the location of metal objects with a surface of at least 6cm x 6cm or hand sized metal objects for example.

Small metal pieces like single coins or nails will be indicated with poor sensitivity or will even be eliminated in some cases because they are out of the range of these frame coils. It is very easy to cover a large area with frame coils in a short time. This is especially useful when looking for bigger deeply buried metal objects while ignoring those smaller metal pieces at the surface.
The following frame mounted search coils have to be carried by two persons with adjustable carrying straps. The search coil should be hold in parallel to the ground at a constant distance of 10 to 60 cm. In order to avoid false signals the electronics control box or additional power bank should always be carried far away from the field of the search coil.

It is also necessary not to wear any belts or shoes with metal content when working with the LORENZ DEEPMAX Z2.

0,67 M X 0,67 M (3 WINDINGS)
UNIVERSAL CABLE COIL 8 M PERIMETER

The 8m universal cable coil has to be arranged to a 3 winding search coil and has to be fixed on a 0,67 m x 0,67 m frame made of PVC-tubes for example. Never use any metal screws for the construction of a frame! This is the smallest frame mounted search coil which offers extreme detection depths for smaller and medium sized objects. Metal fragments and some coins will still be indicated.

1 M X 1 M (2 WINDINGS) UNIVERSAL
CABLE COIL 8 M PERIMETER

The universal cable coil has to be arranged to a 2 winding search coil and has to be fixed on a 1 m x 1 m PVC- tube frame for example. Searching with the 1 m x 1 m frame coil is mainly advisable when looking for hand sized or bigger metal objects buried deep while ignoring small coins, nails and pieces of foil at the surface of the ground. The possible detection depths with this particular frame coil are very high compared with standard sine wave VLF-TR-detectors (see chapter 11). This is one of the reasons why this particular search coil is used for most professional applications. Large areas can be covered in a short time. Best results are achieved with metal objects having a surface of at least 10 cm x 10 cm. Because of the size of the coil most of the small metal fragments will be ignored. However bigger nails can be identified with the conductivity/ time delay metal identification. Most of the smaller nails and other metal fragments can be easily eliminated by increasing the distance between the search coil and the ground. Even at distances of 50 cm or more there will only be negligible detection depth losses when locating large metal objects.

This frame coil has to be carried by two persons with carrying straps.
The high depth range of the 1 m x 1 m frame coil is achieved with intense and therefore deep going magnetic field transmitted. For even higher detection depths use the 12 m cable coil which can be arranged to 1,5 m x 1,5 m or even 3 m x 3 m frames.

2M X 2M (1 WINDING) UNIVERSAL
CABLE COIL 8 M PERIMETER

The 8m universal cable coil has to be laid to a single turn on a metal free frame and has to be fixed with tape for example. This particular search coil covers four times as much ground as a 1 m x 1 m frame coil does. It should only be used when searching for metal objects with a surface of at least 20 cm x 20 cm pointing towards the coil. Smaller metal objects will be located less effectively than with a 1m x 1m frame. This is mainly because it will become more difficult to pinpoint those smaller objects with the large coil. The maximum detection depth is very high and can only be increased with the 12m cable coil arranged to a 1,5 m x 1,5 m or 3 m x 3 m frame. The 2 m x 2 m frame coil can be carried by two persons without any carrying straps at a distance of about 80cm above the ground. This is particularly useful when trying to ignore medium sized metal objects which are smaller than a horseshoe for example. Coins and nails will no longer be detected when doing this.

The 2 m x 2 m coil acts as a large aerial for medium wave transmitters. The next coil described will be less sensitive in general but won‘t suffer from electromagnetic interference of transmitters or power lines.

1M X 2M COMPENSATED COIL
(TWO SEPARATE WINDINGS) UNIVERSAL
CABLE COIL 8 M PERIMETER

In order to construct this compensated coil the 8 m coil cable has to be laid to the figure of the shape of an eight (8) first. The coil cable has to be fixed on a 1 m x 2 m frame with a center part which divides the frame into two 1m x 1m frames. The cable has to be laid and fixed twice on the center part as this is the middle of the eight (8). This type of frame mounted search coil is about 30% less sensitive than a 1 m x 1 m search coil. This is because of the opposite directions of the transmitted magnetic field. During the receiving phase the two windings of the eight do also work in opposite. Therefore, interference and some ground indications are subtracted from each other and therefore eliminated. Interference from radio transmitters or power lines will be almost completely cancelled. This compensated 1 m x 2 m frame mounted search coil is of great advantage when locating metal objects in areas where interferences are often expected. This type of coil has a very poor sensitivity to small metal objects. The minimum surface of a metal plate should be 10 cm x 10 cm to ensure good results when working with this coil. The LORENZ DEEPMAX Z2 will work very stable with this particular coil. The following described 1 m x 1 m double frame coil will give much higher detection depths namely almost the same sensitivity range as a single 1m x 1m frame but is also capable to cancel out said EMI (electromagnetic interferences).

UNIVERSAL CABLE COIL 12 METERS
PERIMETER 1,5M X 1,5M (TWO WINDINGS)
OR 3M X 3M (ONE WINDING)

Different versions for use with LORENZ DEEPMAX Z1 and Z2 available.

Similar to the 8m universal cable coil this large cable coil can be arranged to two different frame coils by simply mounting one or two windings on a metal free frame with tape for example. With the largest 3m x 3m frame coil the highest possible detection depths can be achieved. This is mainly possible because of specially developed electronics to eliminate low frequency interference and a power pulse circuit built-in the LORENZ DEEPMAX Z2. The high sensitivity for large and deeply buried metal objects and the simple elimination of smaller metal fragments make these two coils interesting.

The shape of these large coils should be the same as with the other coils namely round or square. It is also possible to build elliptical or different shapes but this is only achieved at the expense of sensitivity.

Anyway, it is advisable to keep a distance of at least 20 to 80 cm constantly between the coil and the ground to reduce the amount of ground effects to a minimum when using these very large coils.

In the near of power lines the amount of interferences produced will be higher than with smaller coils and therefore again the sensitivity might be reduced. The ground balancing system GND should be changed to DEL in some cases using these large coils because of the same reason. Some customers use these large frame coils with two similar coils mounted on each other at a distance of about 100 cm the same way as the differential double frame coil described below. A Z2 Y-adapter cable would be necessary doing this. A test making sure that both coils work in the same direction as described before would also be necessary.