EMAG E/M/F
Demagnetizer 2.980
Fig 1 Demagnetization coils EMAG
Application
Various acceptance and delivery specifications
for semi-finished products and parts demand that
these parts are not magnetized or that their residual field strength lies below a stipulated limit
value.
When defect testing of ferromagnetic material
with the eddy current or leakage flux method, the
test material is generally magnetized to saturation. Ferromagnetic test material will have afterwards an inadmissible high residual magnetism.
This can be reduced back to the prescribed values only by using a strong magnetic alternating
field.
The demagnetizers EMAG E, EMAG M and
EMAG F generate strong alternating magnetic
fields which are adequately powerful to demagnetize bars and tubes.
The most practical method is to append the demagnetization coils to the end of a testing line.
The in-line arrangement prevents other areas of
the testing or production system being magnetized.
Mode of operation
Magnetized parts can be demagnetized using
various methods. Good and stable results are,
however, offered only by demagnetizing the part
in an alternating field.
Demagnetization is performed either in a long coil
with a relatively low field strength or in a short coil
with a high field strength. The part must be
moved at an appropriate speed through the coil.
This also applies to demagnetization of longdrawn-out parts such as bars and tubes.
The demagnetizers EMAG E, EMAG M and
EMAG F use short coils and therefore can be put
space-saving into the testing line. These short
coils generate strong alternating fields on which
can be superimposed a weak, adjustable DC field
(not EMAG E). The alternating field demagnetizes
the magnetized part and the subordinate DC field
compensates for the static magnetic field which is
always present at the location of the demagnetization coil. The static magnetic field may have
various causes, the most frequent of which are
magnetized conveying mechanisms and leakage
fields of the magnetization yokes used on the flaw
testers. If the static field is not compensated for, it
can be "frozen" in the material during the course
of the demagnetization process and is manifested
as a residual field over the entire length of the
material. For some applications this compensation is not necessary.
Centric driver
General lifting table
EMAG E can be used in that case.
The penetration depth of the alternating field in
the test material and, thus, the demagnetization
effect depend, amongst other things, on the conductivity of the material and the frequency of the
magnetizing alternating field.
Demagnetizer EMAG E and EMAG M operate
with mains frequency. EMAG E is a low-cost unit
and well-suited for use with tubes with up to 4
mm wall thickness, EMAG M with tubes up to 8
mm wall thickness as well as bars up to approx.
30 mm diameter.
Demagnetizer EMAG F features an electronic
converter. The demagnetizing current is adjustable and stabilized. The demagnetization frequency is selectable and allows even large penetration depth. It is the universal system for
demagnetizing bars up to approx. 70 mm diameter and tubes up to approx. 25 mm wall thickness.
The subordinate DC field can be set with high
resolution on both models EMAG M and EMAG
F, but not for EMAG E.
When using the demagnetizer in an unfavorable
magnetized testing line, compensation magnets
can be used to reduce the entrance of flux produced by the testing line.
Marking device
Sensorsystem DEFECTOMAT M 90
Demagnetizing coil
Compensation magnet
Sensorsystem CIRCOGRAPH Ro65
Fig. 2 Arrangement of the demagnetization coil on a testing line
2.980
2
Mechanical construction
Demagnetizers EMAG M and EMAG F each consist of a demagnetization power supply and a demagnetization coil. EMAG E needs no external
demagnetization power supply, because it is directly integrated to the coil housing within a control box.
Electrical connection on the coil:
Modular terminal blocks in an aluminium housing, enclosure IP 65.
Two coils, arranged directly one after the other,
can be operated simultaneously in conjunction
with the demagnetization power supply EMAG M
in order to increase the material throughput.
The demagnetization power supply EMAG M/F is
mounted on a standard mounting plate and incorporated in an industrial-standard, steel sheet
housing respectively in a 23 HU cubicle with air conditioning.
The electrical connection is done via modular
terminal blocks.
The demagnetization coils EMAG E, EMAG M
and EMAG F are sealed with a particularly resistant casting resin. The casting resin has very
good thermal properties. The heat is dissipated
from the coil by convection and radiation. No
additional cooling media required with EMAG E
and EMAG M coils.
Fig 5 EMAG coil F 50 with cooling fan
Fig 3 EMAG M power supply
Fig 4 EMAG F power supply
EMAG F 50 coil is always delivered with a cooling
fan. Cooling fans for EMAG coils F 110 and F
200 are optional. The cooling is recommended,
when the EMAG is used continuously without
any cyclical interrupt controlled by light barriers
or the conveyer system. EMAG F 260 coil needs
no additional cooling, because the dimensions
allow sufficient dissipation of the heat.
The demagnetization coils are connected to the
demagnetization power supply by means of
screened standard industrial cables.
3
Fig 6 EMAG coil F 260
2.980
Technical data
Demagnetization power supplies
EMAG M
EMAG F
Housing dimensions W x H x D [mm]
380x380x210
600 x 1200 x 800
Overall dimensions W x H x D [mm]
380 x 400 x 270
600 x 1354 x 845
Mains connection
230 / 400 V
3 x 400 V
Mains frequency
50 (60) Hz
50/60 Hz
Current consumption (max.)
15 A
25 A
Power loss of the power supply
100 W
1000 W
Ambient temperature
+ 5... + 40 °C
+ 5....+ 40 °C
Mass
15 kg
152 kg
Demagnetizing frequency
Mains frequency
5… 100 Hz
Demagnetizing current
15 A (max)
10 …50 A
Demagnetization coils EMAG M/E
M 50 [E 50]
M 110
Maximum bar diameter *
30 mm [no bars]
30 mm
Maximum tube diameter
40 mm
100 mm
Maximum wall thickness *
8 mm [4 mm]
8 mm
Maximum material temperature
80 °C
80 °C
Maximum transportation speed
2 m/s [1 m/s]
2 m/s
Coil voltage
230 V
400 V
Maximum coil current
14 A
15 A
Maximum field strength **
58 kA/m
59 kA/m
Power loss of the coils
235 W
290 W
Maximum ambient temperature
45 °C
45 °C
Coil mass
55 kg [57 kg]
70 kg
*
**
***
****
2.980
typical
depending on material diameter
depending also on demagnetizing frequency
ambient, continuous operation
4
Demagnetization coils EMAG F
F 50
F 110
F 200
F 260
Maximum bar diameter *
40 mm
70 mm
55 mm
-
Maximum tube diameter
40 mm
100 mm
180 mm
240 mm
Maximum wall thickness *
20 mm
25 mm
25 mm
25 mm
Maximum material temperature
80 °C
80 °C
80 °C
80 °C
Maximum transportation speed *** 3 m/s
2 m/s
2 m/s
2 m/s
Coil voltage
500 V
500 V
500 V
500 V
Maximum coil current
50 A
50 A
50 A
50 A
Maximum field strength
84 kA/m
68 kA/m
56 kA/m
57 kA/m
Field strength stray flux
<0,25 kA/m
<0,25 kA/m
<0,25 kA/m
<0,25 kA/m
Power loss of the coils
235 W
290 W
330 W
350 W
Max. ambient temperature
45 °C
45 °C
45 °C
45 °C
Coil mass
55 kg
70 kg
100 kg
150 kg
Max. Extraction force
160 N
650 N
1000 N
1600 N
Max. Coil temperature ****
85 °C
85 °C
85 °C
85 °C
Max. transportation
Max. transportation
Max. transportation
Max. transportation
speed with F 50
speed with F 110
speed with F 200
speed with F 260
5 Hz
0.3 m/s
0.25 m/s
0.25 m/s
0.25 m/s
7,5 Hz
0.45 m/s
0.35 m/s
0.35 m/s
0.35 m/s
10 Hz
0.7 m/s
0.5 m/s
0.5 m/s
0.5 m/s
15 Hz
1.0 m/s
0.7 m/s
0.7 m/s
0.7 m/s
20 Hz
1.3 m/s
0.9 m/s
0.9 m/s
0.9 m/s
30 Hz
2.0 m/s
1.4 m/s
1.4 m/s
1.4 m/s
50 Hz
3.2 m/s
2.2 m/s
2.2 m/s
2.2 m/s
75 Hz
4.8 m/s
3.3 m/s
3.3 m/s
3.3 m/s
100 Hz
6.3 m/s
4.4 m/s
4.4 m/s
4.4 m/s
Demagnetizing frequency at
5
2.980
Dimensions
136
for EMAG E
Fig 7 Demagnetization coils - dimensions
Fig 8 EMAG F 50 with cooling fan - dimensions
2.980
6
Fig 9 Distances between testing line components
Size [mm]
NM 50
NM 110
NM 200
NM 260
A
195
266
350
440
B
250
330
400
480
C
300
380
450
530
D
117,5
153
215
260
E
215
286
390
480
F
330
270
270
270
G
250
190
190
190
Type
NM [mm]
Order-No.
Part-No.
E 50
50
1956701
2.980.01-6505
M 50
50
1355481
2.980.01-6105
M 110
110
1576305
2.980.01-6111
F 50
50
1355490
2.980.01-6305
1697145
2.980.01-7050
1576704
2.980.01-6311
1812084
2.980.01-7110
1355589
2.980.01-6320
1812092
2.980.01-7200
1868730
2.980.01-6326
Cooling fan (standard)
F 110
110
Cooling fan (option)
F 200
200
Cooling fan (option)
F 260
7
260
2.980
Ordering instructions
Designation
Part-No.
Order-No.
EMAG E 50
Operating instructions english, EMAG E
2.980.01-6505
2.980UA06/EN
1956701
EMAG M 50
2.980.80
1588834
Demagnetization power supply EMAG M
Demagnetization coil EMAG M 50
Cable set EMAG M, 10 m*
Operating instructions english, EMAG M
2.980.01-1100
2.980.01-6105
2.980.01-9101
2.980UA06/EN
1551973
1355481
1588826
1637290
EMAG M 110
2.980.81
1585541
Demagnetization power supply EMAG M
Demagnetization coil EMAG M 110
Cable set EMAG M, 10 m*
Operating instructions english, EMAG M
2.980.01-1100
2.980.01-6111
2.980.01-9101
2.980UA06/EN
1551973
1576305
1588826
1637290
EMAG F 50
2.980.82
1593293
Demagnetization power supply EMAG F
Demagnetization coil EMAG F 50
Cooling fan EMAG F 50 (Standard)
Cable set EMAG F, 10 m*
Operating instructions english, EMAG F
2.980.01-1302
2.980.01-6305
2.980.01-7050
2.980.01-9301
2.980UA06/EN
1956574
1355490
1697145
1593277
1637282
EMAG F 110
2.980.83
1593285
Demagnetization power supply EMAG F
Demagnetization coil EMAG F 110
Cooling fan EMAG F 110 (Option)
Cable set EMAG F, 10 m*
Operating instructions english, EMAG F
2.980.01-1302
2.980.01-6311
2.980.01-7110
2.980.01-9301
2.980UA06/EN
1956574
1576704
1812084
1593277
1637282
EMAG F 200
2.980.84
1593307
Demagnetization power supply EMAG F
Demagnetization coil EMAG F 200
Cooling fan EMAG F 200 (Option)
Cable set EMAG F, 10 m*
Operating instructions english, EMAG F
2.980.01-1302
2.980.01-6320
2.980.01-7200
2.980.01-9301
2.980UA06/EN
1956574
1355589
1812092
1593277
1637282
EMAG F 260
2.980.85
1856588
Demagnetization power supply EMAG F
Demagnetization coil EMAG F 260
Cable set EMAG F, 10 m*
Operating instructions english, EMAG F
2.980.01-1302
2.980.01-6326
2.980.01-9301
2.980UA06/EN
1956574
1868730
1593277
1637282
* Cables delivered in parts! Other cable lengths are available!
2.980
8
Should you have any special problems please contact:
Institut Dr. Foerster GmbH & Co. KG
Division TS Semi-finished product testing
In Laisen 70
72705 REUTLINGEN
GERMANY
Phone
+49 7121 140-272
Fax
+49 7121 140-459
ts@foerstergroup.de
www.foerstergroup.de
Information and illustration may
be subject to change
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