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FIELD TEST OF METAL DETECTOR TREX® 204 M
Dzafer Kumbara
The new metal detector TREX ® 204 M was tested from
the middle of April by local EOD (explosive ordnance
disposal) officers in Orasje, Bosnia. The following results
became available at the end of June:
First of all it was investigated whether the detector
would meet the requirements of humanitarian land
mine detection. The UPMAH-3 was used as reference
object. This was buried in a test bed and had to be
detected at various depths and with commonly used
probe detection speeds over the ground.
Depth Detection speed Indication
10 cm 0.3 m / Sec. yes
13 cm 30 cm / Sec. yes
16 cm 30 cm / Sec. yes
Satisfactory test results were achieved with medium
detector settings in respect of mineralized ground and
the sensitivity.
The detector was then used every day by 16 different
EOD officers. The conclusive impression was good.
The convincing features were:
That it was lightweight, that the location of detected
objects could be determined precisely and that the device
could be operated very fast and easily. The search
coil, which looks like a hockey stick, is perfectly suited
for use in dense vegetation and high grass, among
rocks and under undergrowth. It provides the safety
necessary for EOD officers to progress their work rapidly
and easily.
When used on the damaged parts of buildings, holding
the detector head into the cracks before removing
rubble also helps to ensure the EOD officers‘
safety when working. The alarm signal helps in differentiating
between large and small objects and whether
these are at low or great depths.
The inspector (supervisor) found that the productivity
with the TREX ® 204 M was 11 m 2 in half an hour. This
is equivalent to a performance of 110 m2 per day. No
other detector could reach this level of performance!
The detector does not work when used close to electricity
cables buried in the ground. This is indicated
by a continuous alarm signal with several stops. On
the other hand the device functions in a proper and
undisrupted manner when used near high-tension
(power) lines with high discharges. A total of 21 antipersonnel
mine fuses could be detected in a very precise
and reliable manner on 11.05.2010. Additional
fuses of the same type have been detected at a depth
of 15 cm under vegetation.
On the following day we detected further fuses in the
beds of bombed greenhouses with the same level of
safety.
14| ebingernews
It has to be noted that mineral fertilizers had been used in the past and this had led
to the ground being highly mineralized. The TREX ® 204 M was not affected by this.
On 17.05.2010 it was operated with modified ground compensation settings on a
non-cooperative mineralized ground.
The conclusion of our EOD organisation is: All safety requirement and work quality
parameters were met by the use of TREX ® 204 M in the mine field. The slim hockey
probe offers a lot of advantages when used under dense vegetation. The speed at
which small and large objects can be detected and their position indicated as well
as the depths at which detection can be achieved are satisfactory. In contrast to
other detectors pinpointing was possible. The alarm signal enhances productivity
and helps to avoid crucial failures.
TREX® 204 M on highly mineralized non-cooperative ground
The detector has been tested in Herzegowina at the Suva Smokva Nr. 8 location,
which is part of the organisation N&N Ivsa from Orasje. After the pre-inspection of
the field by another modern detector, the TREX ® 204 Mwas used for quality control.
The test results obtained were as follows:
The test took place on 18.06.2010 starting 6 a.m. The humidity was very high and
the temperature was around 18°C. The test started with the examination of a fuse
whose holder was located 40 cm above the ground. The pre-inspection included:
- active detection of fuses at a depth of 10 cm (13 and 15 cm) with a speed of 0.3 m
per second with elevated head
The next detection field included the examination of buried fuses. In this case a
continuous alarm was obtained with a medium sensitivity and ground compensation
setting. Accordingly the settings for sensitivity and ground compensation were
adjusted until the ground interference was suppressed.
It has to be noted that for this the detector had to be switched off and then on again.
This meant that detector adjustment took around 30 to 45 sec.