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Manual
SBL10
9 / 69
Version 1.27
Product Description
3
The iron locator SBL10 is a rugged and highly sensitive vertical difference magnetometer. It is used
for locating ferromagnetic objects in the ground. The aluminum made device is very light-weight
and very easy to handle. Once the batteries are inserted, the SBL10 is immediately ready for
operation.
Ferromagnetic objects in the vicinity of an operating SBL10 unit are indicated by a moving display
pointer and by an acoustic signal. In addition to the build in sensor probe, a second sensor probe
can be connected to the SBL10 unit by using a connector cable. This additional probe is used for
borehole and offshore surveys.
Also available as an option is a PDA which can be used for recording of field and borehole survey
data. If required, a GPS can also be connected to the SBL10 when working with a PDA.
Furthermore headphones are available to be used with the SBL10 unit.
Measurement Principle of the Sensor
3.1
The earth's magnetic field and the magnetic field that every ferromagnetic object has, are the basis
on which the SBL10 is working. Whenever these two magnetic fields superimpose each other, a
magnetic interference field is established. These interference fields can be measured. The farther
away a ferromagnetic object is from the device, the lower is the measured value of the interference
field.
The SBL10 unit measures this interference field with two single-axis Fluxgate sensors. The
sensors are placed in series in a certain vertical distance from each other (sensor bottom
separation). The value of the magnetic interference field results from the difference between values
of the lower sensor and the values of the upper sensor. The SBL10 display indicates this difference.
At the same time, an acoustic signal can be heard.
The value of the interference field that is caused by a ferromagnetic object depends on different
parameters. Some of the parameters are:
·
The size of the ferromagnetic object.
·
The objects position in the ground.
·
The magnetic permeability of the object.
·
The object's own magnetic field.
Areas of Application
3.2
The device was designed to locate ferromagnetic objects in the ground. When being used in its
standard version, the SBL10 can only be used for measurements on the surface or in shallow
waters. An option is available allowing the use of the SBL10 unit for borehole or underwater
surveys. For this kind of surveys, an additional probe and a special connector cable is required.
The connection between the additional probe and the connector cable is watertight. However, the
control and display unit as well as the battery compartment are not designed for under water
deployment.