Model EM4-HVA Electromagnet Manual
Contents
1. 4 Maintenance 4 1 General 4 2 Adjusting the Pole Locking Lever Motion 4 3 Rust Prevention 4 4 Rust Removal 4 5 Foreign Matter This chapter describes the general maintenance to be performed on the Model EM4 HVA The pole locking lever has a ratcheting mechanism which may be used to adjust the movement ofthe pole locking levers To change their movement follow this procedure 1 Pulluponthe central portion ofthe pole locking lever This frees the pole locking leverfrom the pole locking screw 2 Rotatethe pole locking lever it should move independently ofthe screw to the desired position You may need to hold the central screw with a hex key to ensure it moves independently 3 Releasethe pole locking leverto re engage the screw Generally it is desirable thatthe pole locking lever be able to lock and unlockthe pole caps in one motion without having to re adjust the ratcheting mechanism Follow these tips to prevent rust on your electromagnet m Wipe clean all pole and polecap surfaces with a clean lint free cloth lightly oiled with high quality light oil Maintaining a layer of light oil will prevent rust build up on the steel parts ofthe electromagnet Even corrosion resistant parts are subject to deterioration m Tooilthe pole and sleeve retract the left pole fully into the electromagnet coil extend the right pole fully and lubricate the extended pole Repeat for the oppo site pole m Running the2. 1 Introduction 1 7 Remanent Field Plots cm in cm in cm in cm in 10 4 7 6 3 2 7 11 19 0 75 2 5 1 6 5 2 5 2 5 10 7 5 3 2 5 1 4 6 18 2 5 10 5 gt 2 5 1 1 8 0 7 2 5 1 0 1 3 0 5 3 6 1 4 0 5 1 2 2 5 1 13 0 5 1 0 0 4 0 8 0 3 Size of cylindrical volume with less than 1 variation in field intensity centered in the mag net airgap at 5000 Oe applied field TABLE 1 3 Typical EM4 HVA field uniformity 1 cm cube The remanent field plots depicted in this manual are typical response curves mea sured on production units Response is typical and subject to some variation How ever the response in your 4 should not vary significantly from the data illustrated below e 25 mm 1in 50 mm 2 in cc 75 mm 3 in 100 mm 4 in Remanent Field B kG 20 40 60 80 100 120 Magnet Air Gap mm FIGURE 1 10 Model EM4 HVA remanent field versus air gap versus pole cap diameter Model EM4 HVA Electromagnet 1 8 TypicalStrayFieldPlots 11 1 8 Stray The stray field plots depicted in this manual are typical response curves measured on production units Typical response is subject to variation As stray field may be Field Plots affected by the environment near the electromagnet it is up to the use
3. 33 If the flow switch is assembled with the red arrow mark exiting the top of the flow switch contact housing without seeing the white arrow mark the system is set for the switch contact to close when the required flow rate is achieved See FIGURE A 4 left factory default If the flow switch is assembled with the white arrow mark exiting the top of the flow switch contact housing red mark is also visible the system is set for the switch con tact to open when the required flow rate is achieved See FIGURE A 4 left alternate configuration Finetuningthe exact flow rate setpoint is possible by making fine adjustments to the position ofthe flow switch contact housing assembly See section A 5 Please consult the Flow Switch Users Manual for additional details and information on how to convert from normally open to normally closed operation EL akeShore www lakeshore com 34 Appendices Model EM4 HVA Electromagnet Appendix B Units for Magnetic Properties B 1 Units for Magnetic Properties Quantity Symbol Gaussian amp CGS emua Conversion Factor Cb SI 8 rationized mksc Magnetic flux density 4 gt Magnetic induction B Gauss G 10 Tesla T Wb m Magnetic flux Maxwell G cm2 108 Weber Wb volt second V s Magnetic potential difference UF Gilbert Gb 10 47 Ampere A magnetomotive force Maghetie field strength H Oersted Oe e Gb cm 103 47 A mf magnet
4. Additional Standard Pole Caps does not include bolts order separately EM4 1PB Pole cap nominal 100mm 4 inch diameter tapered to nominal 25 mm 1 inch face EM4 2PB Pole cap nominal 100mm 4 inch diameter tapered to nominal 50 mm 2 inch face EM4 3PB Pole cap nominal 100mm 4 inch diameter tapered to nominal 75 mm 3 inch face EM4 4PB Pole cap nominal 100mm 4 inch diameter with nominal 100 mm 4 inch face Additional Pole Caps with Optical Access Hole s does not include bolts order separately EM4 1PB 0 1 2 Pole cap nominal 100mm 4 inch tapered to nominal 25 mm 1 inch face optical access 1 pole 3 2mm 1 8 inch diameter EM4 1PB 0 2 2 Pole cap nominal 100mm 4 inch tapered to nominal 25 mm 1 inch face optical access both poles 3 2mm 1 8 inch diameter EMA 1PB O 1 4 Pole cap nominal 100 mm 4 inch tapered to nominal 25 mm 1 inch face optical access 1 pole 6 4mm 1 4 inch diameter EMA 1PB O 2 4 Pole cap nominal 100 mm 4 inch tapered to nominal 25 mm 1 inch face optical access both poles 6 4mm 1 4 inch diameter EMA 2PB O 1 2 Pole cap nominal 100 mm 4 inch tapered to nominal 50 mm 2 inch face optical access 1 pole 3 2mm 1 8 inch diameter 4 2 0 2 2 Pole nominal 100 mm 4 inch tapered to nominal 50 mm 2 inch face optical access both poles 3 2mm 1 8 inch diameter 4 2 0 1 4 Pole nominal 100 mm 4 inch tapered to nominal 50 mm 2 inch face optical access 1 pole 6 4mm
5. 1 4 inch diameter EM4 2PB 0 2 4 Pole cap nominal 100 mm 4 inch tapered to nominal 50 mm 2 inch face optical access both poles 6 4mm 1 4 inch diameter TABLE 5 2 EM4 HVA series electromagnets El akeShore www lakeshore com 28 CHAPTER 5 Options and Accessories Model 4 Electromagnet Pole cap nominal 100 mm 4 inch tapered to nominal 75 mm 3 inch face optical access 1 EE TI pole 3 2mm 1 8 inch diameter EMA 3PB O 2 2 Pole cap nominal 100 mm 4 inch tapered to nominal 75 mm 3 inch face optical access both poles 3 2mm 1 8 inch diameter EMA 3PB O 1 4 Pole cap nominal 100 mm 4 inch tapered to nominal 75 mm 3 inch face optical access 1 pole 6 4mm 1 4 inch diameter EM4 3PB 0 2 4 Pole cap nominal 100 mm 4 inch tapered to nominal 75 mm 3 inch face optical access both poles 6 4mm 1 4 inch diameter EM4 4PB 0 1 2 Pole cap nominal 100 mm 4 inch diameter with nominal 100 mm 4 inch face optical access 1 pole 3 2mm 1 8 inch diameter EM4 4PB 0 2 2 Pole cap nominal 100 mm 4 inch diameter with nominal 100 mm 4 inch face optical access both poles 3 2mm 1 8 inch diameter EM4 4PB 0 1 4 Pole cap nominal 100 mm 4 inch diameter with nominal 100 mm 4 inch face optical access 1 pole 6 4mm 1 4 inch diameter EM4 4PB 0 2 4 Pole cap nominal 100 mm 4 inch diameter with nominal 100 mm 4 inch face optical access both poles 6 4mm 1 4 inch diameter Other
6. FIGURE 1 4 EM 4 coil connection block rear view Depending on the design of the generating coils provided with your electromagnet there may be a copper grounding lug provided on the coil connection block at the rear of each electromagnet coil See Chapter 2 Section 2 6 Installation Procedures for more infor mation on electromagnet grounding The maximum field plots depicted in this manual are typical response curves mea sured on production units Response is typical and subject to some variation How ever the response in your EM4 HVA should not vary significantly from the data illustrated below The Model EM4 HVA max field versus air gap versus pole cap diameter is one ofthe most useful plots for determining available field levels for a particular airgap length and polecap diameter combination This plot shows the maximum field available at a particular airgap with 70 A of applied current forall four main polecap combinations 100 75 50 and 25 mm 4 3 2 and 1 in Use this curve along with data from the field uniformity section ofthis manual to determine which pole caps are appropriate for a particular application Field Field kG 35 1 5 Typical Field Intensity Plots 7 30 N ul N e 100 mm 4 in 75 mm 3 50 mm 2 in 25 mm 1in 20 40 60 80 100 Magnet Air Gap mm FIGURE 1 5 Model EM4 HVA maximum field versus air gap at 4
7. Shipping weight 420 kg 925 lbs Suggested magnet power supply Lake Shore Model 643 nominal 70 A 35 V 2 5 kW The following figures show dimensions of the Model EM4 HVA from the front side and rear views EL akeShore www lakeshore com 1 Introduction EM4 HVA w o Stand EM4 HVA S with stand Front View cm inches 83 6 32 90 43 8 17 25 33 7 13 25 10 7 4 20 80 9 31 86 L 30 5 12 001 _ 0 78 0 32 THRU PLACES 614 24 18 41 9 16 50 7 6 3 00 7 6 3 00 444 17 37 FIGURE 1 2 Model EM4 HVA electromagnet dimensions front view Model EM4 HVA Electromagnet 1 4 Dimensions 5 3141 918 25 EM4 HVA w o Stand EM4 HVA S with stand Side View cm inches 42 5 16 75 15 2 6 00 19 5 7 68 2 5 1 00 3 8 1 50 3 2 11 251 12 3 4 85 45 1 771 7 6 3 00 28 9 11 36 1 4x 0CIN THRU e PLACES 7 6 3 00 6 6 2 61 494 17 75 51 7 20 36 FIGURE 1 3 Model EM4 HVA electromagnet dimensions side view EY akeShore www lakeshore com 6 1 Introduction 1 5 Typical Field Intensity Plots Model EM4 HVA Electromagnet 10 7 cm 4 2 in 2x8mm 5 16 in diameter holes on DC POWER DC POWER terminal lugs 11 4 cm 4 5 in WATER OUT THERMAL INTERLOCK WATER IN 2x male tab disconnect 2 1 4 in FNPT with terminals 1 4 in MNPT to 10 mm 3 8 in hose barb adapter
8. is often used in place of J d 1 gauss 105 gamma y e Both oersted and gauss are expressed as cm g s 1 in terms of base units f A m was often expressed as ampere turn per meter when used for magnetic field strength g Magnetic moment per unit volume h The designation emu is not a unit i Recognized under SI even though based on the definition gH J See footnote c j ur 14 x all in SI u is equal to Gaussian p k B Hand ugM H have SI units J ms M Hand B H 4x have Gaussian units erg cm3 R B Goldfarb and FR Fickett U S Department of Commerce National Bureau of Standards Bolder Colorado 80303 March 1985 NBS Special Publication 696 For sale by the Superintendent of Documents U S Government Printing Office Washington D C 20402 TABLE B 1 Conversion from CGS to SI units akeShore www lakeshore com 36 Appendices Model EM4 HVA Electromagnet
9. A Three phase alternating current power line Earth ground terminal Protective conductor terminal Frame or chassis terminal On supply Off supply FIGURE 1 15 Safety symbols 1 9 Safety 13 Equipment protected throughout by double insulation or reinforces insulation equivalent to Class Il of IEC 536 see Annex H CAUTION High voltages danger of electric shock CAUTION or WARNING See included documentation CAUTION Hot surface El akeShore www lakeshore com 14 1 Introduction Model EM4 HVA Electromagnet 2 1 General 15 Chapter 2 Installation 2 1 General 2 2 Site Planning 2 3 Cooling Water Requirements C CAUTION 2 4 Unpacking This chapter covers electromagnet installation Site planning in section 2 2 cooling water requirements in section 2 3 unpacking in section 2 4 accessories in section 2 5 installation procedure in section 2 6 and the return and shipping procedure in section 2 7 Considerthese things when choosing the installation site m Magnetic environment minimize environmental magnetic fields Common sources of interference are fluctuating loads on adjacent power lines heavy duty power transformers elevator motors and similar electromagnetic devices m Structural support floor strength allow for adequate support of components and handling equipment The floor must be sufficiently rigid for minimum vibration from adjacent dynamic loads as well
10. between the coils holds them firmly in place Do not remove this material until the magnet is installed in the final location 1 Leavethe magnet bolted to the shipping pallet during transportation to the installation site it protects the magnet from vibration and the effects of an uneven floor Do not subject the magnet to sudden bumps or jolts To avoid danger to personnel and equipment damage bolt the magnet to the stand and boltthe stand to the floor If you are not using the stand bolt the magnet directly to floor 2 Removethe shipping pallet and use the appropriate lifting equipmentto position the magnet and stand if present at the planned location Markthe bolt holes move the magnet and drill the bolt holes Insert the bolt studs in the holes and secure Replace the magnet and stand overthe studs and bolt in place Check the pole caps for signs of minor rust or corrosion Oy mw Due to changes in humidity and temperature during transportation it is possible for the pole pole cap and other steel surfaces to become wet causing minor corrosion to form This is a minor surface effect which be removed with a 4 0 or finer crocus cloth 7 Connectthe water supply to the 1 cm 3 8 in hose barb fittings on the magnet rear see section A 2 for flow switch installation Each electromagnet coil has one inlet Lower and one outlet Upper water fitting The lines to each individual coil are paralleled at the fa
11. frame m EM4 models achieve unmatched field intensities in air gap widths up to 11 cm 4 3 inches with cylindrical or tapered pole caps m Water cooled coils provide excellent field stability and uniformity when high power is required to achieve the maximum field capability for the electromagnet m Easy pole cap exchange by 3 bolt pole caps for variations in pole face diameters m Accurate pole alignment by precise construction of air gap adjustment mecha nism m Precision yokes of magnetically soft high purity steel assure precise pole face alignment critical for good homogeneity and reproducibility m The H Yoke frame design is reclined at a 40 angle for enhanced air gap accessibility m Thecompactsize of the Model EM4 HVA permits convenient bench top mounting m Couple the Model EM4 HVA with a Lake Shore 643 magnet power supply MPS to form a versatile laboratory electromagnet characterization system The advanced design of the true bipolar Model 643 MPS allows for very rapid uni form magnetic field reversal resulting in enhanced Hall effect measurement of semiconductors and other materials and improved four quadrant hysteresis loops with shortened integration intervals The Model 643 MPS also provides rapid uniform magnetic field reversal to avoid discontinuities that often occur during zero cross over when using non bipolar power supplies The basic components of the Model EM4 HVA electromagnet are shown in the pic ture belo
12. lower magnetic field density while pole caps focused to a smaller pole face will yield higherfields and lower field uniformity Standard pole caps are made of high purity iron with a thin electroless nickel finish for corrosion resistance Pole caps comprised of materials with higher saturation induction such as FeCo can also be installed to further increase field strength To remove a pole cap you must unbolt the three pole cap retaining screws remove the old pole caps and attach the new pole caps using three socket head cap screws of appropriate length A hex key kit is provided to assist in fastening the socket head cap screws Due to changes in the mounting geometry ofthe pole caps screw lengths vary with pole cap geometry See the table below forthe correct screw length when attaching standard Lake Shore 45 degree taper angle pole caps You may wish to Degauss the pole caps before removing them from the pole caps Residual magnetism may hold the pole caps in contact with the pole caps with enough force to make it difficult to separate them You can reduce residual magnetism to a minimum by alternately reversing the magnetic field polarity and gradually reducing the energizing current to near zero The pole caps are then easily removed from the pole caps using a wrench Use a light oil on the threads ofthe pole core Handle the pole caps with care Deep dents or scratches on pole caps can impair the magnetic field homogeneity When installi
13. polecap diameters EM4 HVA at 70 A 35 30 N ul N o m m 10 20 30 40 50 60 70 Current FIGURE 1 6 Field versus current versus airgap EM4 HVA 25 mm 1 in Fe polecaps e mm 10 mm 15mm 16 3 mm ex 2 mm e 22 9 mm 25 mm 28 4mm 38 1 mm 50 mm 50 8 mm 75 mm 100 mm 77110 mm EllakeShore www lakeshore com 8 1 Introduction 30 25 20 pa Field pa Current FIGURE 1 7 Field versus current versus airgap EM4 HVA 50 2 Fe polecaps 25 20 15 10 Field kG Current A FIGURE 1 8 Field versus current versus airgap EM4 HVA 75 mm 3 in Fe polecaps Model EM4 HVA Electromagnet 5 mm gt 10 mm 15mm 16 3 mm ex 20 mm e 22 0 mm ex 25 mm ex 28 4 mm 0538 1 mm 750 mm 50 8 mm 75mm 100 mm 110mm e mm 10 mm 15 mm 716 3 mm ex 2 mm 22 9 mm 25 mm 28 4 mm 238 1 mm 50 mm 50 8 mm 75mm 100 mm 110 mm 25 1 6 TypicalField Uniformity 9 5 mm 20 10 mm 15 mm 16 3 mm 15 Field KG ex 20 mm e 22 9mm 75 mm 10 1 6 Typical Field Uniformity
14. rr ERI 27 ACCESSOTIES YMO RR ae Y RR UP 27 E akeShore www lakeshore com Appendix A Flow Switch Installation Appendix B Units for Magnetic Properties Model EM4 HVA Electromagnet A 2 4 5 6 A 7 B 1 General ETE 29 EM4 HVA Replacement Flow Switch 0 e 29 EM4 HVA Flow Switch 5 5 29 EM4 HVA Flow Switch Installation 29 EM4 HVA Flow Switch Adjustment 2 31 EM4 HVA Flow Switch Operating Mode 32 Units for Magnetic Properties me 35 1 1 1 2 Description 1 1 General 1 E Chapter 1 Introduction The EM4 HVA electromagnet is suited for many applications such as susceptibility measurements Hall effect studies magneto optical studies and magnetic resonance demonstrations We welcome comments concerning thismanual Although we try to keep it error free some may occur When reporting a problem describe it briefly and include the man ual title and page number Send your comments to Lake Shore Cryotronics Inc Attn Technical Publications 575 McCorkle Blvd Westerville Ohio 43082 8888 Continuously adjustable air gap allowing rapid air gap changes to suit individual experiments assures magnet versatility Poles lock in place by turning engaging levers on each side ofthe electromagnet
15. switch interlock will be pre wired into the normally closed safety interlock ofthe included power supply which runs the electromagnet For the Model 643 power supply make certain the 4 pin screw terminal connector is mated to the remote enable terminals at the rear ofthe Model 643 power supply See Section A4 1 4 Flow Switch Installation for details From the factory the flow switch and the coil thermal interlocks are wired in series The factory flow switch is set for contact closure when adequate water flow is detected When not supplied as part of a Lake Shore System connect the flow switch to a normally closed interlock to ensure the electromagnet is protected from inadequate flow One normally closed thermal switch is attached to each electromagnet coil The thermal switches have standard male disconnect terminal style leads Connect to the thermal switches with female disconnect terminals The normally closed thermal switch will open when the coil reaches 45 C When the electromagnet coil cools the thermal switch will reset and return to a closed condition When not supplied as part of a Lake Shore System connect in series with normally closed interlock circuitry so that any open in the system will result a system shutoff The normally closed thermal switches on each coil wired series with a normally closed flow switch will provide protection to the electromagnet for many common cooling related fault conditions E
16. the pole piece and drops against hard surface Standard right hand threads are used in the pole cap to pole core mounting When installing pole caps keep the threads and surface free of any foreign material A thin film of grease on all the surfaces prevents rust 8 Alignthe new pole cap with the pole core threaded holes 10 11 12 13 3 5 PoleCapReplacement 23 Using the mounting bolts attach the new pole cap to the pole core Before final tightening turn the pole adjusterto move the pole cap outward by five turns This will draw the polecap into the pole sleeve and perform a final alignment of pole cap pole core and sleeve Use the hex wrench to finally tighten the cap againstthe pole piece Rotate the pole adjuster spokes to move the new pole cap s pole outward until the front ofthe pole cap is as far outward as it can be moved Repeat Steps 4 thru 11 to change the other pole cap Rotate the pole adjuster spokes to move the poles to set the air gap As the final adjustment of airgap it is preferable to rotate the pole adjuster at least one turn outward to eliminate the backlash in the pole adjuster s screw mechanism Eliminating the screw backlash will minimize unwanted pole deflection when large pull forces develop due to the large fields in the electromagnet airgap 14 Lock pole caps in place akeShore www lakeshore com 24 CHAPTER 3 Operation Model EM4 HVA Electromagnet 4 1 25
17. 44 40 2 2 11 LIP 13 1 9 1 Electrostatic Discharge 2 2 0 2 13 1 9 2 Identification of Electrostatic Discharge Sensitive Components 13 1 9 3 Handling Electrostatic Discharge Sensitive Components 13 1 9 4 Equipment Safety Symbols riri ra ee enn neasa raaraa TE 14 emm 15 ERST 15 Cooling Water Requirements 1 4 15 UNPACKING ame 15 ACCESSONMES T I tac 16 Installation econ eere bete Rb eee REICH RR e eH ER 16 Return and Shipping Procedure 19 HE a 21 Geheralicliecle A 21 21 Adjusting the 2 00 0 21 Pole Cap Replacement 21 eI TMMMMMMT 25 Adjusting the Pole Locking Lever 2 25 R stPreventloll s superet p rt 25 R St REMOVA eo Ta EN 25 Foreign Matter son ia E a 25 rr c iii 26 27 System OPUONS cce iE E oU AS a A
18. Accessories 651 537 FLOW SW 2 2G M 1 2NPT BS 652 115 Allen Wrench Set TABLE 5 2 EM4 HVA series electromagnets 29 Flow Switch A 1 General 2 EM4 HVA Replacement Flow Switch EM4 HVA Flow Switch Specifications A 4 EM4 HVA Flow Switch Installation C CAUTION MN Te Installation This appendix details installation ofthe cooling water flow switch Lake Shore P N 651 537 forthe EM4 HVA electromagnet and the Model 643 magnet power supply or any power supply with an external prohibit interlock feature Referto section A 2 to section A 4 for EM4 flow switch installation Ifyour original flow switch becomes defective a replacement flow switch may be ordered m Part number 651 537 m Description FLOW SW 2 2G M 1 2NPT BS Please contact Lake Shore to order a replacement switch The factory adjusts the EM4 HVA flow switch to activate at approximately 7 6 liters 2 gallons per minute The circuit is closed when appropriate flow is achieved It can be field adjusted to a different flow rates refer to Paragraph A8 0 It can also be set for both normally closed N C and normally opened N O contacts refer to Paragraph 9 0 The flow switch incorporates a single pole single throw 5 5 reed switch set to acti vate at a flow rate of approximately 7 6 liters 2 gallons per minute The contacts are rated at 60 VA All necessary fittings are provided to connectthe switch to the c
19. User s Manual Model EM4 HVA Electromagnet Model EM4 HVA H yoke variable gap horizontal field 100 mm 4 inch pole diameter electromagnet Lake Shore Cryotronics Inc 575 McCorkle Blvd Westerville Ohio 43082 8888 USA sales lakeshore com service lakeshore com www lakeshore com Fax 614 891 1392 Telephone 614 891 2243 Methods and apparatus disclosed described herein have been developed solely on company funds of Lake Shore Cryotronics Inc and Toyo Corporation No government or other contractual support or relationship excepting the collaboration with Toyo Corporation has existed which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics Inc in these develop ments Methods and apparatus disclosed herein may be subject to U S Patents existing or applied for Lake Shore Cryotronics Inc reserves the right to add improve modify or withdraw functions design modifications or products at any time without notice Lake Shore shall not be liable for errors contained herein or for incidental or consequential damages in connection with furnishing performance or use of this material Rev 1 1 P N 119 623 12 February 2013 El akeShore www lakeshore com LIMITED WARRANTY STATEMENT WARRANTY PERIOD THREE 3 YEARS 1 Lake Shore warrants that products manufactured by Lake Shore the Product will be free from defects in materials and workmanship for three years from the date of Purch
20. agram to normally closed interlock Lake Shore Model 643 magnet power supply external interlocks require a contact clo sure to allow operation In this setup the flow switch contacts close when the water flow rate is above setpoint This allows the power supply to provide current for the magnet If additional interlocks are to be connected external to the unit they may be added as one or more closed contacts connected in series such as an emergency stop push button When a fault is detected such an interlock would open the circuit indicating the fault and inhibiting power supply output For non Lake Shore power supplies consult the power supply manual for details on where to connect flow switch leads If required the flow switch can also be reconfig ured to open at the desired water flow rate See Section A 6 0 ofthis manual or con sult the flow switch manual for the procedure to change the switch A 5 EM4 HVA Flow Switch Adjustment 31 Model 643 Connections In the case of the Model 643 MPS connect the two flow switch wires to pins and 4 on the Model 643 rear panel at the 4 pin screw terminal connectors labeled MAGNET FLOW SWITCH Polarity is not important The flow switch wiring is a series connec tion of the flow switch contact closed with correct flow and two normally closed coil thermal switches Model 643 Magnet Power Supply Rear Terminal Model EM4 HVA Magnet Flow Switch and Coil Thermal Swi
21. akeShore www lakeshore com 18 CHAPTER 2 Installation Electromagnet Connections Rear View Thermal Thermal Out Switch Connect 4 GAUGE Wire to Coils in Series Configuration for 0 5 Ohm Load a lt 2 Water Flow Interlock Wiring in Series with Wilci Connect Water OUT Wat pini Sur en con to 1cm 3 8 I D Hose Barb ater Water Out FIGURE 2 2 Electromagnet connections 15 A ground connection tapped hole is available at the rear of the electromagnet frame This ground point is provided for customers who would like to use the electromagnet frame as a signal ground or will be bringing hazardous live voltages nearthe electromagnet and would like to make it an electrical safety ground Please verify suitability for such a function and compatibility with local and national electrical codes before making ground connections Scrape off excess paint nearthe connecting screw to ensure a good electrical contact with the bare steel ofthe electromagnet frame Ne Do not connect or disconnect the electromagnet to or from the magnet power supply without first reducing output current to zero amperes and turning off the supply 16 Connect D C power cables from a magnet power supply to the electromagnet a The power supply connections are located on the rear ofthe coils ifthe cables are already connected check screw tightness To access the elec trical connection remove th
22. antability and fitness for a particular purpose Specifically except as provided herein Model EM4 HVA Electromagnet LakeShore undertakes no responsibility that the products will be fit for any particular purpose for which you may be buying the Products Any implied warranty is limited in duration to the warranty period No oral or written information or advice given by the Company its Agents or Employees shall create a warranty or in any way increase the scope of this limited warranty Some countries states or provinces do not allow limitations on an implied warranty so the above limita tion or exclusion might not apply to you This warranty gives you spe cific legal rights and you might also have other rights that vary from country to country state to state or province to province 8 Further with regard to the United Nations Convention for Interna tional Sale of Goods CISC if CISG is found to apply in relation to this agreement which is specifically disclaimed by Lake Shore then this limited warranty excludes warranties that a the Product is fit for the purpose for which goods of the same description would ordinarily be used b the Product is fit for any particular purpose expressly or impliedly made known to Lake Shore at the time of the conclusion of the contract c the Product is contained or packaged in a manner usual for such goods or in a manner adequate to preserve and protect such goods where it is shipped by someon
23. as sufficiently strong to hold the large mass ofthe electromagnet itself m Service utilities maintain room temperature and cooling water specifications m Ambienttemperature magnet cooling water system operates at designed thermal efficiency when room temperature is within normal bounds m Equipment handling ensure adequate moving equipment transportation route clearances and supervision by qualified personnel m Ventilation ensure adequate ventilation especially during use of cryogens m Other factors existing or planned facilities local safety electrical and building codes access to all sides of the equipment for operating and servicing The 4 electromagnet requires 7 6 liters 2 gallons per minute of water flow ata pressure drop of 200 kPa 30 PSI The rated pressure drop includes the restrictions from T fittings and 1 cm 3 8 in I D water distribution lines to the coils as well as restrictions from the factory flow switch Please accommodate any additional pressure drop due to local supply and drain lines Standard municipal water systems are generally suitable to cool the magnet provided proper flow is maintained Use a water filter flowmeter and pressure gauges to monitor coolant water flow If the water temperature is well above 25 C 77 F install a water cooling device at the magnet water inlet Algaecide may be used to limit growth of biological contaminates in the cooling water To avoid moisture con
24. aser s physical receipt ofthe Prod uct the Warranty Period If Lake Shore receives notice of any such defects during the Warranty Period and the defective Product is shipped freight prepaid back to Lake Shore Lake Shore will at its option either repair or replace the Product if itis so defective with out charge for parts service labor or associated customary return shipping costto the Purchaser Replacement for the Product may be by either new or equivalent in performance to new Replacement or repaired parts or a replaced Product will be warranted for only the unexpired portion ofthe original warranty or 90 days whichever is greater 2 Lake Shore warrants the Product only if the Product has been sold by an authorized Lake Shore employee sales representative dealer or an authorized Lake Shore original equipment manufacturer OEM 3 The Product may contain remanufactured parts equivalent to new in performance or may have been subject to incidental use when it is originally sold to the Purchaser 4 The Warranty Period begins on the date of Purchaser s physical receipt of the Product or later on the date of operational training and verification OT amp V ofthe Product ifthe service is performed by Lake Shore provided that if the Purchaser schedules or delays the Lake Shore OT amp V for more than 30 days after delivery then the Warranty Period begins on the 31st day after Purchaser s physical receipt of the Product 5 This limi
25. ctory with reinforced 1cm 3 8 in I D hoses and 2 fittings This produces a single inlet line a 1 cm 3 8 in hose barb fitting and one outlet line another 1cm 3 8 in hose barb T fitting A hose and flowswitch are connected to the outlet Finally another 1cm 3 8 in barb fitting at the flowswitch becomes the final outlet 8 Using radiator clamps or other securing devices attach a 1 cm 3 8 1 0 drain hose to this outlet line 9 Using radiator clamps or other securing devices attach a 1 cm 3 8 1 0 supply hose to the inlet line 10 Test for leaks before attaching power cables 2 6 Installation Procedure 17 Coil out Coil out 1 4 inch FNPT gt 1 4 inch MNPT gt to 1 cm 3 8 inch Coil in Coil in nose barp 4 1 4 inch FNPT gt 1 4 inch MNPT to1cm 3 8 inch pi 2 places hose barb lt switch cable 11 12 13 14 Ear clamps 1cm 3 8 inch hose barb to Unc In 6 places A to coil thermal interlocks flow switch 1 2 inch FNPT inlet outlet 2 inch MNPT t 21 5 cm 8 5 inch 1 2 inc lt 1 cm 3 8 inch hose barb hose section 5 places Out FIGURE 2 1 Magnet flow switch hose and fittings for installation When purchased with a Lake Shore system or Lake Shore power supply the coil thermal interlocks and the flow
26. densation on the magnet adjustthe cooling system to keep the magnet coils above condensation temperature Pure distilled water is not compatible with the copper cooling lines used in the electromagnet Inspect shipping container for damage If itis damaged or the inside cushioning material appears stressed check the shipment for completeness and proper operation following procedures outlined in this manual Keep all packing material in case of return If components are missing from your shipment or if there is mechanical damage or defect apparent or concealed notify Lake Shore If the shipping container or cushioning material shows signs of stress notify the carrier as well as Lake Shore Keep the shipping materials for inspection by the carrier akeShore www lakeshore com 16 CHAPTER 2 Installation 2 5 Accessories 2 6 Installation Procedure C CAUTION A WARNING Model EM4 HVA Electromagnet The standard Model EM4 HVA electromagnet includes the following accessories Quantity Description 2 Power Cables Attached 1 Flow Switch Kit Refer to Appendix A 1 Allen Wrench Set TABLE 2 1 EM4 HVA accessories Referto Chapter 5 for a complete list of electromagnet accessories Follow these procedures to install the magnet The coils are not rigidly attached to the magnet yoke When moving the magnet damage may occur ifthe coils as not secured During shipment dense packing foam or wedges placed
27. e 28 4 mm 38 1 mm 50 mm 50 8 mm 75 mm 100 mm 110 mm 20 30 40 50 60 70 Current A FIGURE 1 9 Field versus current versus airgap EM4 HVA 100 mm 4 in Fe polecaps The field uniformity tables depicted in this manual are typical response curves mea sured on production units Response is typical and subject to some variation The response in your EM4 HVA should not vary significantly from the data illustrated below TABLE 1 2 lists typical field uniformity for EM4 HVA magnets Data will be affected by the field intensity ofthe central magnetic field presence of passive ferrous materi als and active transformers etc magnetic materials and devices in the vicinity of the magnet as well as other effects The first table gives the uniformity of field over a cubic centimeter volume centered in the magnet gap The second table defines a cylindrical volume within which the mag netic field deviates by less than 1 from the central field The cylindrical volume is coaxial with the magnet poles and centered in the gap cm in cm in 1 5 2 0 15 2 5 1 0 05 7 5 3 2 5 1 0 06 2 5 1 0 35 5 2 1 3 0 5 0 16 Percent variation in field intensity about a 1 cm cube centered the mag net airgap at 5000 Oe applied field TABLE 1 2 Typical EM4 HVA field uniformity 1 cm cube EJ akeShore www lakeshore com 10
28. e other than a carrier hired by Lake Shore 9 Lake Shore disclaims any warranties of technological value or of non infringement with respect to the Product and Lake Shore shall have no duty to defend indemnify or hold harmless you from and against any orall damages or costs incurred by you arising from the infringement of patents or trademarks or violation or copyrights by the Product 10 THIS WARRANTY IS NOT TRANSFERRABLE This warranty is not transferrable 11 Except to the extent prohibited by applicable law neither Lake Shore nor any of its subsidiaries affiliates or suppliers will be held lia ble for direct special incidental consequential or other damages including lost profit lost data or downtime costs arising out ofthe use inability to use or result of use ofthe product whether based in warranty contract tort or other legal theory regardless whether or not Lake Shore has been advised of the possibility of such damages Purchaser s use of the Product is entirely at Purchaser s risk Some countries states and provinces do not allow the exclusion of liability for incidental or consequential damages so the above limitation may not apply to you 12This limited warranty gives you specific legal rights and you may also have other rights that vary within or between jurisdictions where the product is purchased and or used Some jurisdictions do not allow limitation in certain warranties and so the above limitations or excl
29. e rubber insulated boots b Connectthe power supply cablesto the terminal blocks on the rearofthe coils The Electromagnet is wired for a nominal 0 5 Ohm Series load In addition to the Positive and Negative terminals one jumper wire is required for the Series connection between the two coils as shown in figure 2 2 c Replace rubber insulated boots before operating magnet d Noteterminal polarity The Negative terminal is on the Left and the Posi tive terminal is on the Right as you look atthe coil connection block from the rear ofthe electromagnet Typical coil wiring is Shown in FIGURE 2 2 Water inlet and outlet are also shown The direction of the B field is from Left to Right when facing the magnet from the front The wiring in FIGURE 2 2 assumes coils wound in a certain direction If you wire the magnet and get a zero field at the center the coils are wound backwards You must reverse both ofthe leads on one coil The magnet coils in FIGURE 2 2 are shown connected in series 0 5 Model EM4 HVA Electromagnet 2 7 Return and Shipping Procedure C CAUTION C CAUTION 2 7 ReturnandShippingProcedure 19 17 Turn on the cooling water and adjust the flow rate m Model EM4 HVA 7 6 liters per minute 2 gallons per minute m Model EM7 HVA 18 Readjust the fittings if any leaking is observed If the electromagnet appears to operate incorrectly contact Lake Shore or a factory representative for a Returned Material Autho
30. el EM4 HVA 1 3 1 Hardware Type Electromagnet resistive coils iron core and yoke Pole diameter nominal 100 mm 4 in Air gap O to 11 0 cm 4 3 in continuously variable Coil configuration 2 coils wired in series Frame design H Frame with left and right pole adjusters and locks Field B vector Horizontal left to right from front view Frame angle of recline 40 degrees Optical access compatibility Optical model only 1 3 2 Electrical Maximum current 70 A Nominal voltage 35 volts approx 38 volts at max coil temperature Nominal power 2 5 kVA 2 65 kVA at max temperature Duty cycle 100 Connections power Copper terminal lug with mounting hole for up to 8mm or 5 16 in fasteners Typical coil resistance Each Coil 2 Coils in Series Nominal 0 250 050 Resistance cold typical 0 230 0460 Resistance max typical 0 270 0 540 TABLE 1 1 Typical coil resistance 1 3 3 Cooling Coolant Clean filtered municipal tap water or water in closed recirculating system Water flow rate 7 6 L 2 0 gal per minute Water pressure drop 200 kPa 30 PSI Max supply pressure 700 kPa 100 PSI Model EM4 HVA Electromagnet 1 3 4 Coil 1 3 5 Polecaps 1 3 6 Materials 1 3 7 General 1 3 8 Shipping Dimensions 1 3 9 Power Supply 1 4 Dimensions 1 3 4 Coil 3 Water recirculating chiller cooling capacity 2 5 kW 8530 BTU Hr Water inlet temperature 15 to 25 C 59 to 77 F Waterflow switch activat
31. eration AX WARNING 3 4 Adjusting the Magnet Air Gap 3 5 Pole Cap Replacement Read the entire manual and check all instruments for proper operation prior to operating the system This chapter covers a general check in section 3 2 operation in section 3 3 magnet air gap in section 3 4 and pole cap replacement in section 3 5 Before operating the magnet verify proper electrical connections cooling water flow inlet pressure and temperature The magnet power supply provides current to the magnet There are no operating controls on the magnet Rotating hand knobs on the side of the magnet allows users to vary the air gap from O to 11 0 cm 0 to 4 3 in Always set current to zero amps and turn off power supply before adjusting the magnet After adjusting pole spacing lock poles in place by securing the locking levers on the EM4 HVA The electromagnet air gap or pole gap is the distance between the left and right polecap at the center ofthe electromagnet The 4 has a continuously adjustable air gap For a given set of pole caps increasing the magnet s air gap decreases magnetic field intensity while decreasing the magnet s air gap increases magnetic field intensity To change the air gap follow these procedures 1 Unlock the poles To unlock the movable poles turn the pole locking levers located onthe front face of the main body ofthe electromagnet counter clockwise until they rotate freely This unscrews the p
32. ion flow approximate Switch closure at 7 6 L 2 0 gal per minute normally open Water flow switch deadband approximate 0 8 L 0 2 gal per minute Water flow switch contact rating 2 A 250 VAC 60 VA reed contact Over temperature limit switch activation temperature approximate Switch opens at 45 C 113 F normally closed auto resetting Connections cooling after T fittings and flow switch 1cm 3 8in hose barb Connections cooling bare coil 0 635 cm 1 4 in NPT to 1cm 3 8 in hose barb adaptors Inter coil spacing 12 0 cm 4 75 in Coil width 12 0 cm 4 75 in Coil diameter 31 1 cm 12 25 in Connection over temperature limit switch 2 male quick connect terminals Available polecap sizes nominal diameter 25 mm 1 in 50 mm 2 in 75 mm 3 in 100 mm 4 in Taper angle for focusing 45 degrees Corrosion protection Electroless Nickel Fasteners 3 per polecap 1 4 20 Alloy steel socket head cap screws 1 4 in dia 20 threads per in Yoke Low carbon steel Pole Core Low carbon steel Pole caps Low carbon steel Coil conductor Copper Coil cooling Copper Size magnet only height width depth 38 7 cm 15 25 in x 84 5 cm 33 25 in x 50 8 cm 20 in Weight magnet only 227 kg 500 Ibs Weight standard base only 63 kg 138 Ibs Floor loading Check weight against structural capacity of floor Shipping dimensions height width depth 130 cm 51 in x 122 cm 48 in x 97 cm 38 in
33. izing force Volume magnetizations M emu cm3h 103 Alm Volume magnetization 47M G 103 A m Magnetic polarization LI emu cm3 4m x104 T Wb m i intensity of magnetization ue 1 A m2 kg Mass magnetization o M emu g 4 107 Wb m kg Magnetic moment m emu erg G 103 A m2 joule per tesla J T Magnetic dipole moment j emu erg G 4n x 10 10 Wb mi ss dimensionless Henry per meter H m Wb 2 7 Volume susceptibility 41 x 10 nom 4m x 103 m3 kg 3 Mass susceptibility Xp Kp cm3 g emu g x 10 10 H m2 kg ike 4n x 106 m3 mol 3 Molar susceptibility cm3 mol emu mol 1023 H m2 mol Permeability Dimensionless 4 107 H m Wb A m Relative permeabilityi pr Not defined Dimensionless Volume energy density w erg cm 101 energy product Demagnetization factor D N Dimensionless 1 41 Dimensionless a Gaussian units and cgs emu are the same for magnetic properties The defining relation is 47 b Multiply a number in Gaussian units by C to convert it to SI e g 1 G x 10 4T G 10 47 c SI Syst me International d Unit s has been adopted by the National Bureau of Standards Where two conversion factors are given the upper one is recognized under or consistent with SI and is based on the definition M where to ug 4x x 10 7H m The lower one is not recognized under SI and is based on the definition HoH J where the symbol
34. ng the pole caps place a piece of soft material cardboard towel etc beneath them to prevent accidental damage ifthey fall during installation Follow this procedure to replace a pole cap 1 Setpower supply current output to zero 2 Turnthe power supply off 3 Makecertain you have the correct length of screws forthe pole cap geometry you will be using The pole caps you wantto install may have a different length than the ones on the electromagnet now See the table below to make certain you have the correct mounting screws 1 4 20 screw length Nominal pole cap face diameter 100mm 4in 57mm 2 25 in 75mm 45mm 175 50mm 2in 32mm 125in 25mm lin 19 0 75 in TABLE 3 1 EM4 HVA polecap and screw length 4 Unlockthe pole locking levers so the pole caps move in and out freely 5 Rotateone pole adjuster s spokes to move one pole cap outward until the front of the pole cap is as far out as it can be moved 6 Rotatethe opposite pole adjuster s spokes to move the other pole cap inward until the pole cap is outside ofthe coil surface The pole cap is now ready to be removed 7 Usingthe hex wrench provided unscrew the mounting bolts one turn counter clockwise Continue carefully unscrewing the pole cap mounting bolts until the pole cap is free Itis important to hold onto the pole cap when unscrewing the mounting bolts The pole may be damaged if it suddenly disengages from
35. nt from the cooling lines Additionally use air pressure to force out any remaining water from the internal coil cooling lines Follow Rust prevention measures mentioned above A package of desiccant may be stored with the magnet to reduce effects from a moist storage environment 5 1 27 amp Chapter 5 Options and Accessories 5 1 General This chapter lists EM4 HVA options in section 5 2 and accessories in section 5 3 5 2 System TABLE 5 1 lists available EM4 HVA Electromagnets The electromagnets can be tai Options lored to fit many custom applications Consult the factory for assistance in configur ing electromagnets for your application Model number Description EM4 HVA S H yoke variable gap set by rotating hand spokes 4 inch diameter pole caps with stand 4 5 Same as 4 with optical access TABLE 5 1 EM4 HVA series electromagnets 5 3 Accessories TABLE 5 2 lists EM4 accessories The standard EM4 system includes the following accessories m 1Set of pole caps either 25 50 75 or 100 mm 1 2 3 or 4 inch and 6 attaching screws m One pair of main lead screws for pole adjuster optical access or standard depending on model m Flow Switch m Power cables 4 AWG 3 m 10 feet long m Magnet base stand Accessories are devices that perform a secondary duty as an aid or refinement to the primary unit Model number Description
36. ole locking screw releasing the clamping force which locks the poles 2 Move pole adjusters The pole adjusters are located at the ends ofthe electromagnet Each one has adjusting handles which appear as spokes When the poles are unlocked the spokes may be rotated to change the air gap position and distance 3 Eliminate pole adjuster backlash When making the final adjustment of an air gap it is preferable to rotate the pole adjuster at least one turn outward to eliminate the backlash in the pole adjuster s screw mechanism Eliminating the screw backlash in this manner will minimize unwanted pole deflection when large pull forces develop between the poles The pull force develops whenever large fields are present in the electromagnet airgap 4 Lock poles To lock the poles turn the pole locking levers clockwise until you feel significant resistance which indicates the poles are locked The Model EM4 HVA electromagnet utilizes replaceable pole caps If another geometry of pole cap is desired the existing pole caps can be unbolted and another pair can be installed Most pole caps are of either a straight or a tapered design focusing the magnetic flux from the 100 mm 4 in pole core to the diameter of the installed pole cap s face Generally pole caps with a larger pole face diameter will give El akeShore www lakeshore com 22 CHAPTER 3 Operation C CAUTION C CAUTION Model EM4 HVA Electromagnet higher field uniformity and
37. oolant outlet of most electromagnets For additional information see the Flow Switch Users Manual For proper switch operation keep it out ofthe field generated by the electromagnet In general connecting the switch at the end of a 10 inch long hose is sufficient to avoid any interference During normal operation cooling waterflows through the magnet at a minimum rate of 7 6 liters 2 gallons per minute which allows the power supply to be turned on To prevent damage to the electromagnet connect the flow switch to the system before operating the power supply Do not manually bypass the interlock feature on the magnet power supply To prevent injury disconnect the power supply from the AC source when working on any magnet or flow switch wiring EL akeShore www lakeshore com 30 Appendices Model EM4 HVA Electromagnet The EM4 HVA flow switch may be connected in series to any normally closed inter lock Additionally the Coil s thermal switches may also be connected in series With these two protective mechanisms installed the system should be protected from many common cooling faults such as lack of water flow or excess coil temperature See FIGURE A 1 Model EM4 HVA magnet flow switch as shown water flow has exceeded the setpoint causing the circuit to close Ep Coil 1 To normally thermal closed switch interlock circuit Coil 2 thermal switch FIGURE 1 EM4 HVA switch wiring di
38. pole adjuster s screw mechanism from end to end is also good for the electromagnet Verify the motion is smooth and does not jam at any point in the travel If problems are encountered when moving the mechanism the lead screw and or sleeve may need to be cleaned and lubricated Consult with the factory m When exchanging pole caps be certain to use light oil on the exposed pole core mating surface to keep it rust free Keeping these parts oiled and free from con tamination is a good preventative measure If condensation is seen on the exte rior of the electromagnet wipe it away with a soft clean dry cloth to prevent corrosion Remove all traces of rust with crocus cloth 4 0 grit or finer Remove all traces of abrasive with a soft clean cloth Remove all traces of foreign matter from pole caps with a soft clean cloth Do not let foreign material fall into the sleeve ofthe electromagnet Due to tight pole to sleeve tolerances any foreign matter introduced into the sleeve when the poles are retracted may cause future operating problems El akeShore www lakeshore com 26 CHAPTER 4 Maintenance 4 6 Storage Model EM4 HVA Electromagnet Long term storage requires some precautions to be taken to prevent deterioration of the electromagnet and it s componentry High or low temperatures can cause soft hard coolant lines to burst and or fail Freezing temperatures can cause water to freeze and burst even the hard lines Drain any coola
39. r to measure the actual stray field in yourfinal location under real operating conditions to get an accurate depiction of the actual stray field distribution in your final location For these measurements The 4 was equipped with 50 mm 2 in diameter pole caps and was set to a 50 mm 2 in air gap 10000 9000 8000 7000 8 6000 5 5000 4000 2 3000 2000 zo Gauss 1000 0 1000 0 100 200 300 400 500 600 700 800 900 1000 Distance mm FIGURE 1 11 Model EM4 HVA stray magnetic field versus distance radially outward 20 15 o gt 5 o d 10 ES eu Gauss 5 0 0 100 200 300 400 500 600 Distance mm FIGURE 1 12 Model EM4 HVA stray magnetic field versus distance expanded radially outward EJ akeShore www lakeshore com 12 Field Gauss Field Gauss CHAPTER 1 Introduction 160 140 4 120 100 80 60 40 20 200 300 Distance mm 400 500 FIGURE 1 13 Model EM4 HVA stray magnetic field versus distance axially outward 20 600 15 10 em Gauss FIGURE 1 14 Model Em4 HVA stray magnetic field versus distance expanded axially outward Model EM4 HVA Electromagnet 200 300 Distance mm 400 500 600 1 9 Safety O A Direct current power line Alternating current power line Alternating or direct current power line
40. rization RMA Number Returns will not be accepted without an RMA number Attach a tag with the following information when returning RMANumber m Model and Serial Number m User s Name Company Address Phone Number and Fax Number Malfunction Symptoms Any water left in the cooling lines may freeze during shipping and cause irreversible damage to the magnet coils Pack the magnet in the original shipping crate if possible Fasten it upright toa pallet large enough and rated to handle the magnet weight Use compressed air to force water out of the cooling lines in the coils The coils freely rest on the poles To prevent damage fix coils in place during shipment The magnet will be damaged if turned on it s side Wedge padded wood blocks or high density foam between the coils to hold them against the magnet frame Protect the magnet by wrapping in heavy paper or plastic Seal with plastic tape Make a wood box large enough to cover the whole magnet without touching it and fasten it to the pallet Affix shipping labels FRAGILE warnings UPRIGHT labels and weight of the shipment on the outside of the crate Also write the RMA number on the outside of the shipping crate and on packing slip Use a shipping company that can handle the weight akeShore www lakeshore com 20 CHAPTER 2 Installation Model EM4 HVA Electromagnet 3 1 General 21 amp Chapter 3 Operation 3 1 General 3 2 General Check 3 3 Op
41. tches LH Coil 1 Thermal Switch FIGUREA 2 EM4 HVA flow switch wiring diagram with 643 magnet power supply The flow switch is set at the factory for activation at just below 7 6 liters 2 gallons per minute At this flow rate contact closure will occur The flow rate can be adjusted in the field using the following procedure See FIGURE A 3 1 Loosenthe friction plate screws to allow movement ofthe reed contact Very small increments in either direction are all that is necessary to change flow cutoff point settings 2 Toreducethe flow cutoff point push the contact housing further into the housing To increase the flow cutoff point pull the contact housing out from the housing 4 Donotmovethe contact housing enough to expose the white arrow mark w EJ akeShore www lakeshore com 32 Appendices Reed switch 7 contact housing White arrow mark Red arrow mark Plate screw direction FIGURE A 3 Flow switch rate adjustment A 6 EMA HVA Flow The EM4 HVA flow switch is factory configured for switch closure when the required Switch Operating flow rate is achieved The flow switch may be converted for switch opening when the Mode required flow rate is achieved Reed switch contact housing FIGURE A 4 Left Flow switch alternate configuration Right Flow switch factory default There is a red arrow and a white arrow mark on the flow switch contact housing assembly Model EM4 HVA Electromagnet
42. ted warranty does not apply to defects in the Product resulting from a improper or inadequate installation unless OT amp V services are performed by Lake Shore maintenance repair or cali bration b fuses software power surges lightning and non rechargeable batteries c software interfacing parts or other sup plies not furnished by Lake Shore d unauthorized modification or misuse e operation outside of the published specifications f improper site preparation or site maintenance g natural disasters such as flood fire wind or earthquake or h damage during ship ment other than original shipment to you if shipped through a Lake Shore carrier 6 This limited warranty does not cover a regularly scheduled or ordi nary and expected recalibrations of the Product b accessories to the Product such as probe tips and cables holders wire grease varnish feed throughs etc c consumables used in conjunction with the Product such as probe tips and cables probe holders sample tails rods and holders ceramic putty for mounting samples Hall sample cards Hall sample enclosures etc or d non Lake Shore branded Products that are integrated with the Product 7 Tothe extent allowed by applicable law this limited warranty is the only warranty applicable to the Product and replaces all other war ranties or conditions express or implied including but not limited to the implied warranties or conditions of merch
43. transmitted any form or by any means electronic mechanical photocopying recording or otherwise without the express written permission of Lake Shore www lakeshore com EY akeShore Model EM4 HVA Electromagnet Chapter 1 Introduction Chapter 2 Installation Chapter 3 Operation Chapter 4 Maintenance Chapter 5 Options and Accessories 1 3 1 2 1 3 14 1 5 1 6 1 7 1 8 1 9 21 22 2 3 2 4 2 5 2 6 2 7 3 1 3 2 3 4 3 5 4 1 4 2 4 3 4 4 4 5 4 6 5 1 5 2 5 3 E Table of Contents Generali 1 General Description 00 0 000 00 SE 1 e 2 E31 HardWare P o 2 3 2 i 2 EPR vane naesendy bea ndeaals Vows aodhieennes bea tele cave AEE 2 1 3 4 COU eal n ba adie dene bd 3 4538 ae 3 136 ata 3 ER O A 3 1 3 8 Shipping Dimensions 1 4 2 4 2 0 2 2 2 22 2 2 2 3 13 9 POWEESUDDIV tah 3 DIMENSIONS RET 3 Typical Field Intensity Plots e eme 6 Typical Field 222222222 2 2 222 2 2 2 2 0 0 0202020200 0 9 Typical Remanent Field Plots 2 2 2 2 2 22202 2 10 Typical Stray Field Plots 2 2 4
44. u sions of some warranties stated above may not apply to you 13 Except to the extent allowed by applicable law the terms of this limited warranty statement do not exclude restrict or modify the mandatory statutory rights applicable to the sale ofthe product to you CERTIFICATION Lake Shore certifies that this product has been inspected and tested in accordance with its published specifications and that this product met its published specifications atthe time of shipment The accu and calibration ofthis product atthe time of shipment trace ableto the United States National Institute of Standards and Technology NIST formerly known as the National Bureau of Stan dards NBS TRADEMARK ACKNOWLEDGMENT Many manufacturers and sellers claim designations used to distin guish their products as trademarks Where those designations appear in this manual and Lake Shore was aware of a trademark claim they appear with initial capital letters and the or symbol CalCurve Carbon Glass Cernox Duo Twist High Temperature Cernox Gamma Probe SoftCal Quad Lead Quad Twist and Thermox are trademarks of Lake Shore Cryotronics Inc IDEAS is a trademark of Unisys Corporation and is licensed for use with Lake Shore software drivers Copyright 1995 1999 2001 02 2004 2013 Lake Shore Cryotronics Inc All rights reserved No portion of this manual may be reproduced stored in retrieval system or
45. w The magnet base supports the magnet frame The electromagnet poles are composed of iron providing a high permeability core for the electromagnet gen erating coils The generating coils when energized with DC current provide the turns x current or NI which magnetizes the high permeability core iron creating a high magnetic flux density in the airgap of the electromagnet The magnet frame provides a magnetic return path for the generated flux The entire structure becomes low loss high efficiency magnetic circuit optimized for magnetic field uniformity and intensity The two continuously adjustable pole adjusters allow for easy modification of the magnet airgap located between the pole caps of the electromagnet The pole lock allows the user to lock the electromagnet poles in place after an airgap adjustment is made A variety of pole cap diameters are offered allowing the user to choose the appropriate combination of field intensity and uniformity for the required applica tion Pole caps are also available as special optical access models which allow for axial optical access to the electromagnet airgap for lasers or other optical devices EL akeShore www lakeshore com 2 CHAPTER 1 Introduction POLE CAP AIR GAP COIL POLE LOCK POLE ADJUSTER v A MAGNET LA FIGURE 1 1 Model EM4 HVA electromagnet front view MAGNET BASE 1 3 Specifications The following sections provide the specifications for the Mod
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