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By default, the metal detector does not beep when it detects ferrous alloys (undesired metals). The
pointer will move anticlockwise into the left-hand part of the analogue display (21) ("FERROUS") and the
"FERROUS" LED indicator will switch on, but there will be
no
audible signal.
h)
Configuring the sensitivity - SENSITIVITY
• The
SENSITIVITY
dial (8) can be used to configure the metal detector for different search depths and improve
detection accuracy. Moving the dial to the left reduces the search depth and decreases possible interference (e.g.
due to metal splinters and underground cables). Moving the dial to the right increases the search depth, but also
increases possible interference (e.g. due to metal splinters and underground cables).
•
Adjust the dial to suit your needs. If you hear a rattling sound, move the dial back until the sound stops. This
indicates that the sensitivity setting is correct.
12. Handling the metal detector
a) Testing reactions to different metals
Before searching for metals, you need to learn how the metal detector reacts to different types of metals and their
location/distance. In order to do so, you should conduct a range of tests with different metals and detection angles.
Before conducting a test, familiarize yourself with how the metal detector reacts to different metals (e.g. coins, rings
and silver cutlery). For the first test, use the metal detector at home. Do not test the metal detector on floors or ceilings,
as these often contain metal supports and steel reinforcements. We recommend placing the test objects on a plastic
or wooden table without steel components.
•
Before conducting a test, remove sources of interference such as electronic devices (wearables), jewellery,
watches and rings.
• Place the metal detector on a plastic or wooden table and ensure that there are no nearby metals that may cause
interference. Align the detection probe (1) so that the flat side is pointing upwards.
• Move the metal test object backwards and forwards over the search probe at a low height.
•
When the metal detector detects an object (e.g. coins, watches, rings, jewellery or scrap iron), memorise the optical
and acoustic signals and the distance of the object from the search coil. Practice until you are confident interpreting
the optical and acoustic signals.
• Hold the metal test object at different angles and note how the acoustic signal changes.
• Repeat this process with test objects made of different metals.
b) Interpreting the display and acoustic signals
Switch on the metal detector. The metal detector will beep at three possible pitches: low, medium and high (400, 700
and 1500 Hz). The pitch indicates the strength of the signal. The visual display/audio signal depends on the metal
detector settings and a number of other factors.
