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 R TE 08 RS001159ufQacMturewrith E . FO G. NO n manipment a E u erm t eq S-R DQ first G urren the ddy c of e 1 900 O IS Order-no. Edition Author 159 783 3 04/2011 Urban n atio tific cer ® Registered trade-mark © Copyright Institut Dr. Foerster GmbH & Co. KG FOERSTER TECOM, s.r.o. U Tvrze 13/30 108 00 Praha 10 Czech Republik Tel.: +420 2 72658542 Fax.: +420 2 72658417 Email: foerster@foerster.cz FOERSTER RUSSLAND CJSC B.Pod'yacheskaya Str. 9 190068 St.-Petersburg Russian Federation Tel.: +7 812 3187101 Fax.: +7 812 3187101 (*1) Email: mail@foerster.ru FOERSTER FRANCE SAS Parc Work Center - Bat. 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