Comprehensive Operating Manual & Guide to Metal Detecting
PRO-ARC
22
PRO-ARC
Comprehensive Operating Manual & Guide to Metal Detecting
The Menu System (continued)
To change a setting, rotate the knob.
To increase a value, rotate to the right
(clockwise)
To decrease a value, rotate to the left
(counterclockwise)
If you select a function and do not make a
change to that function after 7 seconds,
the detector will exit the menu system
automatically, deactivate the SETTINGS
knob and resume normal operation.
If you press the MENU button while the
machine is in normal operation, the user
interface will return to the last menu
feature setting. This feature allows you to
have quick access to a function that you
want to adjust frequently.
25
56
Capabilities and Limitations
DEPTH
The PRO-ARC can detect U.S. coins to a depth of up to 15-16 inches (37-40cm) under good
conditions. Large objects (55 gallon drums, manhole covers, etc.) can be detected to a depth
of up to several feet (1-2 meters).
Electrical interference from power lines and from electrical appliances and electronic
equipment can reduce detection depth, or cause audible interference, making it necessary for
the user to reduce the sensitivity setting. Soils with large amounts of iron or salt minerals may
also reduce detection depth or necessitate a reduction in the sensitivity setting.
TARGET IDENTIFICATION
The PRO-ARC identifies the probable type of metal object by measuring its effective electrical
conductivity, which is displayed as a number from 0 to 99 on the LCD screen. The effective
electrical conductivity of an object depends on its metallic composition, size, shape and
orientation relative to the searchcoil. Since coins are minted to tightly controlled specifications,
they can be accurately identified. Identification of pull-tabs and foil is less consistent because
these kinds of targets come in wide variety. In general, smaller objects, and objects made
from lower conductivity alloys such as iron, bronze, brass, lead, pewter and zinc, will read
lower on the effective conductivity scale. Larger objects and objects made from higher
conductivity alloys such as silver, copper and aluminum, will tend to read higher. The notable
exceptions are gold, which usually reads low because it is rarely found in large pieces, and
Comprehensive Operating Manual & Guide to Metal Detecting
PRO-ARC
22
PRO-ARC
Comprehensive Operating Manual & Guide to Metal Detecting
The Menu System (continued)
To change a setting, rotate the knob.
To increase a value, rotate to the right
(clockwise)
To decrease a value, rotate to the left
(counterclockwise)
If you select a function and do not make a
change to that function after 7 seconds,
the detector will exit the menu system
automatically, deactivate the SETTINGS
knob and resume normal operation.
If you press the MENU button while the
machine is in normal operation, the user
interface will return to the last menu
feature setting. This feature allows you to
have quick access to a function that you
want to adjust frequently.
25
56
Capabilities and Limitations
DEPTH
The PRO-ARC can detect U.S. coins to a depth of up to 15-16 inches (37-40cm) under good
conditions. Large objects (55 gallon drums, manhole covers, etc.) can be detected to a depth
of up to several feet (1-2 meters).
Electrical interference from power lines and from electrical appliances and electronic
equipment can reduce detection depth, or cause audible interference, making it necessary for
the user to reduce the sensitivity setting. Soils with large amounts of iron or salt minerals may
also reduce detection depth or necessitate a reduction in the sensitivity setting.
TARGET IDENTIFICATION
The PRO-ARC identifies the probable type of metal object by measuring its effective electrical
conductivity, which is displayed as a number from 0 to 99 on the LCD screen. The effective
electrical conductivity of an object depends on its metallic composition, size, shape and
orientation relative to the searchcoil. Since coins are minted to tightly controlled specifications,
they can be accurately identified. Identification of pull-tabs and foil is less consistent because
these kinds of targets come in wide variety. In general, smaller objects, and objects made
from lower conductivity alloys such as iron, bronze, brass, lead, pewter and zinc, will read
lower on the effective conductivity scale. Larger objects and objects made from higher
conductivity alloys such as silver, copper and aluminum, will tend to read higher. The notable
exceptions are gold, which usually reads low because it is rarely found in large pieces, and