B) Metal Differentiation (Discrimination); Operation; A) Functions And Display - Renkforce MD 200 Bedienungsanleitung

b) Metal differentiation (discrimination)

Each metal type exhibits its own characteristic phase shift, which makes it possible to distinguish between different
types of metals. Using phase shift to identify different types of metals is known as discrimination. Metal objects with
inductive resistance, i.e. large objects made of good conductors (gold, silver, copper) exhibit a larger phase shift.
Metal objects with ohmic resistance, i.e. small objects made of poor conductors exhibit a smaller phase shift. See the
following list for the approximate conductivity values of different conductors (metals and electrolytes).
Material Electrical
conductivity (S/m)
Silver 63.01 × 10
Nickel 14.3 × 10
6
Copper 59.6 × 10
6
Iron 9.93 × 10
6

11. Operation

a) Functions and display

Push button (reset) (9)
DISCRIMINATION dial (15)
MODE dial (16)
GROUND dial (7)
TUNE dial (5)
VOLUME dial (13)
Material
Gold
6
Platinum
Aluminium
Tin
Together with the TUNE dial (5), this push button is designed to configure/
adjust the zero position of the display pointer.
Use this dial to configure the discrimination threshold for different metals.
Use this dial to switch on the metal detector and select the mode. There are
three modes: "VLF", "TR1" and "TR2".
"VLF" mode is the default setting.
"TR1" mode is the primary metal detection mode. This mode distinguishes
between different types of conductive objects, such as gold (non-ferrous
metal) and steel (ferrous alloy) and indicates the metal type on the analogue
display (21).
"TR2" mode is used for a more accurate analysis of objects detected in
"TR1" mode. It distinguishes between objects such as gold and aluminium
and indicates the metal type on the analogue display (21).
This dial allows you to configure the metal detector for different types of
surfaces to improve the search results.
The TUNE dial (5) is designed to tune the detection probe (1) to the
electronic components in the control unit (22). It corrects the zero position on
the analogue display (21).
This dial adjusts the volume of the audio signal (speaker and headphones).
Electrical
conductivity (S/m)
45.2 × 10
6
9.66 × 10
6
37.8 × 10
6
9.17 × 10
6
Material Electrical conductivity
(S/m)
Calcium 29.8 × 10
Zinc 16.6 × 10
Cobalt 16.7 x 10
Salt water 4.788
Fresh water 0.0005 - 0.05
6
6
6
33