Goldanalytix GoldScreenBox Instruction Manual page 10

For calibration please use the copper
calibration piece, that you got together with
your GoldScreenBox [more precisely: Cu-DHP;
it contains a small amount of phosphorus
(0.015-0.040%) leading to a conductance of
only ca. 46-50 MS/m instead of approx. 58
MS/m for pure copper]. Place the calibration
piece on the sensor field and confirm
"Calibration". After the process is finished, the
device will signal "OK".
Please be aware, that all desired values are
programmed for a temperature of 20-22° C
(see "Important Hints" in the Instruction
Manual). If you measure during summer at
30° C, we recommend calibrating the device at
30° C. Please only do this, if measuring at
20° is not possible and be aware, that
deviations in measured values are possible.
In the menu you also have the option to
choose the "Free measuring mode". In this
mode, the device acts like a pure conductivity
measuring device without given set values.
That means that you can establish the
conductivity of the inside of any metal and
compare this established value ("VAL") with
those in the tables of this instruction manual.
The shown value is the electrical conductivity
of the object in megasiemens per meter
[MS/m] up to the corresponding penetration
depth (which is also dependent on the
conductivity of the metal).
Put your metallic object on the measurement
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circle and keep the object there for a
②
moment - the conductivity will be shown as a
value as well as graphically in the coloured bar
(in the bottom part of the screen). The
measuring bar corresponds to the scale of the
electric conductivity of metals (0 to 65 MS/m).
The "free measure mode" allows you to find
out, which material you could be facing and
measure other metals and alloys like gold,
platinum, silver or palladium, respectively.
This is practical, if you want to establish the
conductivity of precious metals like rhodium,
rhenium, ruthenium or iridium (now available
as bullion bars or coins). In the case of
recycling companies or auction houses it can
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