ABB Metal Detector To detect foreign metal objects in a variety of

ABB Metal Detector To detect foreign metal objects in a variety of
ABB Metal Detector
To detect foreign metal objects in a variety of materials
Brief presentation
– of ABB Metal Detector
With ABB's metal detector QSDM 111, the
presence of foreign metal objects can be
detected in a variety of materials. QSDM
111 offers a simple and reliable way of ensuring uninterrupted operation. This can bring
considerable reductions in the costs of repair
and damage to machinery, for example damaged saw disks and blades. Metal detector
QSDM 111 detects all kinds of metals and is
especially well suited for applications where
high detection sensitivity is required.
Metal detector QSDM 111 is in two main
parts: the search coil and the electronics unit.
The electronics unit, which contains a
microprocessor, is housed in a steel wall cabinet.
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The search coil is glassfibre-reinforced and
has embedded transmitter and receiver windings. The search coil has an effective screen
which reduces the effect of the environment
on the metal detector. In the connection box,
which is mounted on the search coil, there is
electronic circuitry which amplifies the
received signal before it is fed to the cable.
The coil is mechanically stable as well as
insensitive to water and dirt.
The equipment is easy to install and operate. It is self-adjusting and requires very little
maintenance.
The operation and design of the detector
The transmitter winding of the search coil
generates a magnetic field in and around the
coil. Equal but opposed voltages are induced
in the two receiver windings, which are connected back-to-back. The resulting voltage is
zero. If a metal object passes through the
search coil, the object will emit its own
magnetic field due to the effect of the transmitter winding. This field influences first
one receiver winding, then the other as the
object passes through, giving a signal. This
signal is amplified and sent to the electronics unit.
Materials that can be detected
All metals can be detected with QSDM 111.
Sensitivity is greatest for ordinary steel,
slightly lower for copper, aluminium and
stainless steel. Non-metallic materials with a
high iron content or good electrical conductivity may give a signal as well.
Alarm outputs
QSDM 111 has two alarm outputs with
same or different sensitivity for metal objects.
One of them can be used, for instance, to
activate a warning bell, the other for an
emergency stop function.
Detector sensitivity
Detector sensitivity is defined as the diameter of the smallest detectable steel ball. The size of the
smallest detectable object depends directly on the size (i.e. diameter) of the search coil. For
QSDM 111 the smallest detectable steel ball is 0.5% of the inner diameter (D) of the coil. The
sensitivity for long objects depends on how they are oriented relative to the coil geometry.
Factors for added reliability
The sensitivity that can be achieved in practice
is highly dependent on the ability of the metal
detector to eliminate the interference that
always occurs in an industrial environment.
Interference from mobile radio equipment and
from motor drive systems powered by frequency converters are particularly troublesome.
These problems have been taken in to account
when designing QSDM 111. Several built-in
functions prevent false indications occuring:
– a screen which heavily surpresses electrical
and magnetic interference
– radio interference suppression filters effectively damp interference from sources
such as mobile phones
– a powerful signal processing function in
the microprocessor filters out electrical
and mechanical interference
Sensitivity in industrial applications
Coil Smallest Nail in fa- Nail in unfasize detectable vourable
vourable
(∅ mm) steel ball
position
position*)
(mm) length, mm length, mm
300
2
4
12
600
4
10
30
800
5
13
40
1000
7
15
50
1200
8
20
60
1400
10
25
75
Coil size
(mm)
1000×1000
1200×1000
1400×1000
1600×1000
1800×1000
3
Smallest detectable steel ball
(mm)
12
13
14
15
16
*) "Unfavourable position"
means that the nail is
placed radially at the center of the coil. Even slight
deviations from this position gives significantly
higher sensitivity.
Metal-free zones of the detector
0
I
II
Di
D1 D2
L1
L2
Metal-free zones of the detector.
Metallic objects close to the detector affect its
sensitivity. There are recommendations concerning the required size of metal-free zones
around the coil. The basic rules is that metallic objects should be avoided in the direction
in which material is being conveyed.
Electronics unit of QSDM 111
As well as supplying the search coil, the electronics unit has functions for:
– detecting signal changes due to the presence of metal
– eliminating interference and preventing
false indications
– alarm indication
– automatic self-adjustment
– self-testing and diagnosis
Setting the sensitivity
The Sensitivity of the detector can easily be
keyed in and changed using pushbuttons on
the front panel of the unit. The settings are
continuously shown on a two-digit display.
The sensitivity should be sdjusted to suit the
conditions at the installation.
Zone 0 should be free from metallic objects.
In Zone I, small metallic objects that do not
move may be permissible.
In Zone II, small moving metallic objects
may be permissible.
Round Coil
Note: Di is equal to the
inner diameter of a round
coil.
Rectangular Coil
C×D (inner size)
(where C ≥ D)
Recommended metal-free zones (mm)
Search coil
Zone I
Zone II
D1
L1
D2
L2
Di
300
420 550 450 750
600
800 1000 900 1500
800
1000 1300 1200 2000
1000
1200 1600 1500 2500
1200
1500 2000 1800 3000
1400
1700 2200 2100 3500
Search coil
Zone I
Zone II
D
D1
L1
D2
L2
1000
1500 1600 1800 2500
4
Setting maximum speed
With the Max Speed function the signal processing of the detector can be matched to the
highest conveyor speed. This gives effectiv
damping of transient interference.
Level indicator for easier setting
A level indicator makes it easy to set the sensitivity on commissioning and is also an
excellent means of continuously displaying
the interference margin. The indicator is in
the form of a row of LEDs.
Test function
Test voltages, error codes and internal parameters can be read off on the panel of the
detector. This provides extensive function
checking without the need for any external
measring instruments.
153
Data for the electronics unit
The front panel of the electronics unit and dimension
drawing.
General data
Supply voltage
Power consumption
Sensitivity
Material travel speed
Alarm function
464
400
For fastener Ø6-Ø11
(4x)
432
500
100-127 V, 200-250 V, +10/-15 %, 47-63 Hz
55 VA
Adjustable: diameter of the smallest detectable
steel ball is 0.5% of search coil diameter
0.2-8 times the inside diameter of the search coil
per second for reliable detection. Detection can
be limited to a given speed range
Has a holding function with selectable resetting:
auto/manual
Contact data of output relays
Max system voltage
250 V ac/dc
Max continuous load
4 A (30 A for 200 ms)
Max breaking/making current ac: 4 A at 250 V cos ϕ > 0.4
dc: 0.3 A at 110, 127 V
0.2 A at 220, 240 V
Contact resistance
0.1 Ω at 0.1 A/24 V/50 Hz
(see also IEC 255-0-20)
Environmental data
Permitted ambient temperatur 0 - +40°C
Degree of protection
S54 according to SEN 2121 (dust-proof, splashproof) IP 65 according to IEC 144
Electromagnetic compatibility
Electrical safety
As per EMC Directive 89/336/EEC
Fulfils the Low Voltage Directive 73/23/EEC
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Search coil
Choosing a coil
The size of the coil to choose depends mainly
on the required sensitivity and the size of the
conveyor belt. As a general rule it is best to
choose as small a coil as possible. This maximises the sensitivity and minimises the
metal-free zones. Normally it is not possible
to alter the width of the conveyor and the
height of the load, so the size of the coil is
usually governed by those dimensions.
An 800 mm search coil.
Environmental data
Ambient temperature -40 to +50°C
Degree of protection S54 to SEN2121
(dust- & splashproof) IP 65 to
IEC144
Dimension drawing, search coils
B
100
Di
C
QSDM
QSDM
QSDM
QSDM
QSDM
QSDM
QSDM
QSDM
QSDM
QSDM
QSDM
6
110S03
110S06
110S08
110S10
110S12
110S14
Di
300
600
800
1000
1200
1400
111S1010
111S1210
111S1410
111S1610
111S1810
A
1500
1700
1900
2100
2300
B
420
800
1000
1200
1500
1700
B
1500
1500
1500
1500
1500
C
1000
1200
1400
1600
1800
C
400
600
800
1000
1200
1400
D
1000
1000
1000
1000
1000
E
1020
1020
1020
1020
1020
Ordering guide
The following ordering instructions should
be observed for quick, reliable delivery.
Check that the correct catalogue numbers are
stated. See the ordering example below.
A comlete metal detector
QSDM 111 with electronics unit, connecting cable
and an 800 mm search
coil.
Description
Electronics unit QSDM 111L
Catalogue number
3BSE021017R1
Weight kg
18
Cable 8 x 0.5 mm2 to connect between
search coil and electronics unit:
max length 100 m
3BSC950205R2
0.2/m
5699 649-C
5699 649-F
5699 649-G
5699 649-H
5699 649-K
5699 649-L
3BSE022119R1010
3BSE022119R1210
3BSE022119R1410
3BSE022119R1610
3BSE022119R1810
25
55
70
110
150
260
340
370
400
425
450
QSDM 110 S03 (Di=300 mm)
S06 (Di=600 mm)
S08 (Di=800 mm)
S10 (Di=1000 mm)
S12 (Di=1200 mm)
S14 (Di=1400 mm)
rectangular: QSDM111 S1010 (1000×1000
S1210 (1200×1000
S1410 (1400×1000
S1610 (1600×1000
S1810 (1800×1000
Search coil, round:
mm)
mm)
mm)
mm)
mm)
Di = inside diameter; see also dimension drawing
Ordering example
The example on the right is for metal detector with a search coil with Di = 1000 mm.
1 x Electronics unit QSDM 110K
1 x Search coil QSDM 110 S10
×* m Connecting cable,
screened, 8 x 0.5 mm2
3BSE021017R1
5699 649-H
3BSC950205R2
*) Please specify your specific needs regarding cable length (m).
ABB reserves the right to change design, data and dimensions without previous notification.
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Repro: KontaktRepro AB, Västerås – Print: Tryckproduktion AB, Västerås 2001-03
3BSE010516R0101
ABB is a global technology company serving customers in power transmission and distribution; automation; oil, gas and petrochemicals;
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Leading edge technology, specific application knowledge and an uncompromising commitment to quality make ABB Automation Products an
important partner for industries in their drive for productivity, quality
and profitability.
ABB Force Measurement is a division within ABB Automation
Products. It provides equipment for accurate, reliable measurement and
control in a broad range of applications from steel making to paper converting industries.
ABB Automation Products AB
We have local representatives in:
S-721 59 Västerås
Sweden
Phone: +46 21 34 20 00
Fax:
+46 21 34 00 05
Internet: www.abb.com/pressductor
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