User's Manual

17
LARGE OR NEAR-SURFACE TARGETS
Targets which are near the surface may give multiple different signals to the device. If you suspect a
target near the surface, lift the search coil and swing it more slowly until a single signal is received.
FALSE SIGNALS AND REASONS
Sometimes, the device may produce signals which are similar to a target signal although no metal
target is present. There are various reasons for the false signals received by the device. The
most common ones are ground mineralization or rocks with high mineral content, surrounding
electromagnetic signals, operation of another nearby detector, rusted or corroded iron or foil in the
soil or sensitivity value set too high.
Surrounding electromagnetic signals can be eliminated by reducing the gain. If another detector
is operating nearby, you may attempt to shift the frequency or perform your search at a distance
where no interference occurs.
ROCKS AND SEARCHING IN ROCKY TERRAINS
Challenging ground conditions arise especially when conductivity and magnetic properties of the
ground are too intense. Operation of the device over such ground is made possible by selecting the
best operating mode, sensitivity and ground balance settings.
Stones and rocks or cavities inside the ground are as important as the ground itself in regards to the
search and target detection quality.
Hot rocks are classified as negative or positive based on their ID being low or high in comparison to
the ID of the soil they are in. One or both of the types may be present in a field. The negative and
positive effects mentioned here will only be valid if ground balancing is properly done on the existing
ground. Otherwise, soil itself will not act differently from hot rocks in terms of ID.
Positive rocks act just like metal and produce a metal sound. In the All Metal mode they produce a
“zip zip” sound when the search coil is moved over them. If the signal is strong enough, the device
may produce an ID for these rocks. Negative rocks in the All Metal mode, produce a long “boing”
sound when the search coil is moved over them. The device does not give an ID for these rocks
even if the signal is strong.
Positive rocks provide a typical metal sound in discrimination modes. Negative rocks do not provide
a sound in discrimination modes (except for rare cases of false signals).
Therefore, you can make a decision by listening to the audio responses produced by the device in
the field. If you receive a metal sound, it means that you either detected a positive rock or a piece of
metal. If you receive a strong signal and a stable ID, you can distinguish if the detected target is a
rock or metal by checking the ID. However, remember that weak signals may produce different IDs
and metals under rocks may produce different metal signals. Therefore, the most appropriate action
is to dig up when a metal signal is received.
METALS UNDER ROCKS
SIMPLEX+ increases the possibility of detecting metal targets under mineralized rocks through the
proper adjustment of your settings. The combined effect created by the rock and metal together
is lower than the effect that the metal creates by itself and the displayed ID will be different than
the metal's expected ID. The displayed ID is formed by the combination of rock and metal together
and gets closer to the ID of the rock if the size of the metal is smaller in relation to the rock. Keep
in mind that metals under hot rocks will never appear with their own metal ID. For instance, a gold
piece under a brick may produce an iron tone and ID.
Remember this very simple principle as it will save you lots of time: “If the target you detect is not
a stone, it can be metal”.
The key to detecting targets under mineralized rocks, particularly when positive rocks are in question,
is the knowledge of the maximum ID value produced by the surrounding positive rocks. If you are
performing a search in the All Metal mode, monitor the ID produced by the device. If the ID provided
by your device is close to the rock and iron zone, it is quite possible that you detected a target under
the rock.
If the hot rocks in your search area tend to give high IDs, then the chances of missing the signals of
small metals underneath will be high as well.
DETECTION ON THE BEACH AND UNDERWATER
SIMPLEX+ is a waterproof metal detector. This provides convenient detection underwater and on the
beach.
As explained before, salt water and alkali grounds are significantly conductive and cause effects similar
to iron in detectors. SIMPLEX+'s Beach mode is specially designed for such conditions. You can perform
your search easily using the Beach mode without requiring any special settings.
Beach mode is ideal for salty wet beach sand. You can use the other modes while performing search
over dry beach sand.
You should consider the following while performing search over wet beach sand or underwater:
1) When you swing the search coil over the holes you dig in wet beach sand, you can receive metal
signals, this is a normal condition.
2) The search coil may give false signals when going into and coming out of the water so please try
to keep the coil either in or out of the water.
3) While detecting on wet beach sand, avoid rubbing or hitting the search coil on the ground. Otherwise,
the device may give false signals.
4) When going from wet sand to dry sand or from dry sand to wet sand while detecting on the beach,
the device may emit false signals. Ground balance the detector after you switch from one another.
5) If you cannot auto ground balance on wet sand and/or in salt water, try manual ground balancing.
If you still cannot ground balance, set the ground balance value to 00.0 manually.
Pay attention to the items below after using the device especially under salty water:
1. Wash the system box, shaft and the coil with tap water and be sure no salt water is left in the
connectors.
2. Do not use any chemicals for cleaning and/or for any other purposes.
3. Wipe the screen and the shaft dry with a soft, non-scratch cloth.