9
M
M
A
A
G
G
N
N
A
A
S
S
M
M
A
A
R
R
T
T
instructions manual
DETECTION DEPTHS
Detection depth increases as the target becomes larger, more magnetic and with oblong
targets buried vertically. Oblong targets aligned or parallel with the probe axis have
the strongest magnetic signal and depth. For non metal targets, ( for example ground
anomalies like voids, dug ground ) greater detection depth is achieved when the surrounding
soil has a high level of magnetism ( iron oxides – ore ), this will permit the magnetometer
to sense the absence of soil, over the void, for example.
Below ranges for various targets when bench (air) testing. Please consider that these ranges
can vary according to ground mineralization, surrounding environment - metals, probe
orientation, target layout, faulting, oxidation, target magnetic properties, metal alloy and
temperature.
KIND OF OBJECT
DEPTH
Screwdriver 20 cm long
1,40 m.
Main water supply pipe 70 cm dia.
3,00 m.
Automobile
5,00 m.
