Accessories and coils
26 cm search coil
This search coil was mainly developed for the location of very small metal objects like small nuggets or coin sized metal objects for example. The maximum detection depth is limited by the size of the object and the coil. In some cases it is easier to pinpoint very small metal fragments with this coil rather than with a double D- coil.
This search coil can be useful while pinpointing large metal objects which have been located with a frame mounted search coil before. Deeply buried metal objects can be out of the range of the small 26 cm search coil and therefore can only be detected with frame mounted search coils. The 26 cm search coil is waterproof and therefore can be used in saltwater for example.
26 cm DD-search coil
A special double D version of this coil with separate transmitting and receiving windings is also available. This coil makes FERROUS / NON-FERROUS indications on the display of the DEEPMAX Z1 possible.
Depending on the type of ground sometimes DD- coils are less affected by extremely mineralized soils but pinpointing will be more difficult than with a single loop coil.
35 cm search coil
This highly sensitive search coil has got very good depth capabilities on single coins and medium sized objects. Nuggets smaller than 5mm in diameter should rather be detected with a 26cm search coil than with this coil due to poor sensitivity to very small metal bits and pieces.
35 cm DD-search coil
Separate transmitting and receiving windings offer more stable operation on soils with changing contents of iron oxides (minerals) in some cases. This coil can be used for most search applications. The FERROUS / NON-FERROUS target identification does work with these 26cm and 35cm double D search coils.
Note: The electrical properties of the double D search coils may change when mechanical tension is produced in the coil when being used not properly. Search coils therefore are not covered by warranty for that reason. The same with the connecting cable which should be fastened with the belt strap first before connecting to the electronics unit to protect the same and to avoid broken cables.
45 cm search coil
This search coil can be operated by a single person with the S-rod-handle. It offers extreme depth ranges on either single coins or bigger objects buried deep in the ground. Depth ranges of more than 1 m for a metal object of the size of a soft drink can (0,33 l) or up to 50cm on a single gold coin with 25mm diameter make this coil interesting for a lot of different search and locating purposes.
Those extreme depth ranges on medium sized and bigger metal objects make frame mounted search coils unnecessary in some cases. Small items can be eliminated by increasing the distance between the coil and the ground. This 45 cm coil covers much more ground than a 26cm coil does and therefore makes very effective searching possible. Coins with a diameter of less than 15mm should rather be detected with smaller search coils.
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. The electronics control box should always be carried far away from the field of the search coil. It is also necessary not to wear any clothes, belts or shoes with metal when operating the detector to avoid false signals.
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 0,67m x 0,67m 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. The maximum detection depth is limited below the bigger frames but higher than with a 45cm diameter coil.
1m x 1m (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 1m x 1m PVC- tube frame for example.
Searching with the 1m x 1m 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. 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 10cm x 10cm. 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 target identification. Most of the 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 1mx1m frame coil is achieved with intense and therefore deep going magnetic field transmitted. The detection depths listed in chapter 11 have been recorded with different DEL Delay and GND Ground settings. In some cases detection depths in wet, conducting ground are slightly higher or lower than listed.
For even higher detection depths use the 12m cable coil which can be arranged similarly to the 8m cable coil to 1m x 1m, 1,5m x 1,5m or 3m x 3m.
2m x 2m frame coil (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 1m x 1m frame coil does. It should only be used when searching for metal objects with a surface of at least 20cm x 20cm pointing towards the coil. Smaller targets 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 1,5m x 1,5m or 3m x 3m 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 2m x 2m coil acts as a large aerial for medium wave transmitters. Therefore smaller frames like the 1m x 1m coil will be of better choice when working in urban areas. The next coil described will be less sensitive in general but won't suffer from electromagnetic interference of transmitters, power lines.
1m x 2m compensated frame coil (two separate windings) universal cable coil 8 m perimeter
In order to construct this compensated coil the 8m 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 1m x 2m 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 centre part as this is the middle of the eight (8). This type of frame mounted search coil is about 30% less sensitive than a 1m x 1m 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 1m x 2m frame mounted search coil is of great advantage when locating metal objects in urban areas where interferences are often expected. This type of coil has a very poor sensitivity for small metal objects. The minimum surface of a metal plate should be 10cm x 10cm to ensure good results when working with this coil. The LORENZ DEEPMAX Z1 will work very stable with this particular coil.
The following described 1m x 1m 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).
Cable coil 12 meters perimeter
1m x 1m (three windings), 1,5m x 1,5m (two windings) or 3m x 3m (one winding)
Similar to the 8m universal cable coil this large cable coil can be arranged to three different frame coils by simply mounting one two or three 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 Z1. The high sensitivity for large and deeply buried metal objects and the simple elimination of smaller metal fragments make these three 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 urban areas the amount of interferences produced from power lines will be higher than with smaller coils and therefore again the sensitivity might be reduced. The ground balancing system GND 1, 2, 3 should be changed to DEL 1-4 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 60 to 80 cm the same way as the differential double frame coil described before. A 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.
1m x 1m frame coil with cable inside tubes
This is a very user friendly 1m x 1m coil with the same electrical properties as the 8m universal cable coil with two windings as described before. The main advantage of this particular search coil is its simple assembly, which can be performed in a few steps. The disassembled coil is easy to transport and will always be ready for use.
The coil cable is protected inside the tubes and therefore can be used even under the worst environmental conditions. Two adjustable carrying straps are supplied with every frame coil.
1m x 1m double frame coil kit
This specially designed double frame coil kit basically consists of two 1m x 1m frame coils mounted on each other at a distance of approximately 60 cm. Because of its ability to cancel out interferences from power lines or radio transmitters it can be used in urban areas where single loop coils will suffer from false signals and poor sensitivity when electromagnetic interferences are present.
The two coils receive the same amount of interference but work in opposite directions. Therefore almost any interference is subtracted from each other while signals from the ground or metal objects will pass to the electronics. It is important that the components of the double frame kit are put together in the right order as described below. The available kit consists of the following components: two 1m x 1m frame coils; four black mounting devices 0,6m length; one Y adapter cable with three connectors; two carrying straps.
The two 1m x 1m frames have to be mounted on each other via the four mounting devices. They will automatically lock when pressing them together.
Please make sure that both frames go in the same direction, so that the two yellow marks are pointing to each other the same way! Afterwards the marked Y adapter plug has to be connected to the lower frame which points to the ground. The second frame has to be connected to the other adapter plug. The third connector has to be connected to the electronics control box.
Note: It is advisable to make an operating test where the lower search coil pointing to the ground gives a signal when approaching to a metal piece located on the ground and the upper coil will cause a decay of the signal when a metal piece is approaching from the top towards the coil. This could only be tested with DEL Delay settings and turned off AUTO 0.
The sensitivity of this double frame coil is almost the same as with the 1m x 1m single loop frame coil. This coil does only suffer from a very weak sensitivity reduction of less than 10 % for very deep and large metal objects. Especially when working in the GND Ground mode it is very useful to work with this particular search coil due to very stable and therefore sensitive operation.
(one Y-adapter cable is included with the double frame coil kit)
for the use with double farme coils
(at least two identical frames or cable coils have to be connected to the same detecting unit)
Extension cable 5m
for use with frame coils only!
programmed for Z1 Data-Logger function, available at your local LORENZ-dealer
Telescopic S pole
For use with smaller search coils.
Adjustable shoulder and belt strap
for easy carrying of detector and the battery pack (available with or without battery)
with 4 way Neutrik connector
Additional battery pack
- Charger wide-ranging AC-input 90-264V
- AC-plug (Euro / USA / UK / Australia)
*) for operation a telescopic S pole with armrest would also be necessary