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Installation and Operation Safety

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400/54 Premium Shielded NMR Magnet System Product Overview

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Nature of Liquid Cryogens

A superconducting magnet uses two types of cryogens: liquid
helium and liquid nitrogen. Helium is a naturally occurring,
inert gas that becomes a liquid at approximately 4K. It is
colorless, odorless, nonflammable, and nontoxic. In order to
remain in a superconducting state, the magnet is immersed
in liquid helium.

Nitrogen is a naturally occurring gas that becomes liquid at
approximately 77K. It is also colorless, odorless,
nonflammable, and nontoxic. It is used to cool the shield
that surrounds the liquid helium reservoir.

During normal operation, liquid cryogens evaporate and
require replenishment on a regular basis.

C A U T I O N

It

Cryogens are delivered to the site in Dewars; these Dewars,
including any carriers, must be nonmagnetic.

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Содержание 400/54 Premium Shielded NMR Magnet System

Страница 1: ...Agilent Technologies Agilent 400 54 Premium Shielded NMR Magnet System System Overview ...

Страница 2: ...nt are furnished under a license and may be used or copied only in accordance with the terms of such license Restricted Rights Legend If software is for use in the performance of a U S Government prime contract or sub contract Software is delivered and licensed as Commercial computer soft ware as defined in DFAR 252 227 7014 June 1995 or as a commercial item as defined in FAR 2 101 a or as Restric...

Страница 3: ... 5 gauss line 15 Magnetic Attraction Zone 16 Occupational exposure to magnetic fields 16 Nature of Liquid Cryogens 17 Hazards Presented by Cryogens 18 Siting Requirements 20 Vents or quench ducts 20 Adequate ventilation during magnet installation 21 Oxygen monitor 21 Routine maintenance involving transfer of cryogens 22 Advice 22 Electrical Safety 23 Safe Access When Working at Height 24 Considera...

Страница 4: ...m Shielded 57 Temperature Sensors 400 54 ASP 59 Platinum resistor thermometers PT100 59 Allen Bradley temperature sensors 59 Location of temperature sensors 59 Wiring Diagram 60 10 pin seal pin designations 400 54 ASP 60 19 way shim socket pin designations 400 54 ASP 62 5 Agilent E5025 Cryogen Monitor Safety 66 Compliance Notice 67 Overview 68 Description and Operating Principle 70 Technical speci...

Страница 5: ... and Alarms 85 Ethernet Communication 86 Ethernet 86 6 Technical Specifications System Description 88 The Superconducting Magnet 89 General description 89 Magnet specifications 90 Superconducting shim coils 90 The Cryostat 92 General Description 92 Specifications 92 Customer Interface Drawings 94 System Components 96 Superconducting magnet system components 96 Standard ancillary parts provided wit...

Страница 6: ...4 400 54 Premium Shielded NMR Magnet System Product Overview ...

Страница 7: ...5 Agilent 400 54 Premium Shielded NMR Magnet System System Overview Agilent Technologies 1 Introduction Safety Warnings 6 Compliance Notice 8 Contact Information 9 Important Notice 10 ...

Страница 8: ... so that even large objects will move toward the magnet with considerable velocity WARNING Under fault conditions it is possible for large amounts of helium and or nitrogen to be released from the system for example during a magnet quench Under these conditions the gas is very cold and can cause cold burns If the gas is not vented properly asphyxiation is possible due to the displacement of oxygen...

Страница 9: ...Overview 7 WARNING Limit the magnet power supply to the operating current of the magnet plus 10 Energize the magnet only after completion of cooling NOTE Agilent Technologies makes available technical information and parts for repair or maintenance where appropriate ...

Страница 10: ...tive of the European Community This unit is to be installed and operated as detailed Any modification or maintenance procedure undertaken which is not approved by Agilent Technologies UK Ltd could nullify the marking of this product and lead to prosecution A Declaration Of Conformity in accordance with the above directive has been made and is located at Agilent Technologies Yarnton Oxfordshire UK ...

Страница 11: ...ountry click the following link select your country and then click Go http www chem agilent com en us ContactUS Pages Contact Us aspx USA Address Agilent Technologies Inc 5301 Stevens Creek Blvd Santa Clara CA 95051 Telephone Numbers Toll Free 1 800 227 9770 Agilent website all countries To find contact information for your location click the following link select your country and then click Go ht...

Страница 12: ...fy Agilent Technologies within three days of receipt of goods Failure to do this invalidates any possible claim Disclaimer Every precaution has been taken in the preparation of this publication Agilent Technologies assumes no responsibility for errors or omissions Neither is any liability assumed for damages resulting from the use of the information contained herein ...

Страница 13: ... 12 Nature of the Magnetic Field 13 Hazards Presented by the Magnetic Field 14 Magnetic Field Safety Requirements 15 Nature of Liquid Cryogens 17 Hazards Presented by Cryogens 18 Siting Requirements 20 Electrical Safety 23 Safe Access When Working at Height 24 Considerations for the Outbreak of Fire 25 General Safety Potential Hazards 27 ...

Страница 14: ...uction The site for a superconducting magnet system must meet national state and local safety regulations For magnet systems site safety issues primarily relate to magnetic fringe fields and handling liquid cryogens This section summarizes these potential dangers and makes recommendations for the facility ...

Страница 15: ...and people at risk from the magnetic field are considered safe outside the 5 gauss line Occasionally fault conditions cause magnets to lose their superconducting properties which in turn causes their magnetic fields to collapse For a magnet that is actively shielded before the magnetic field collapses it can momentarily bloom slightly beyond its normal dimensions For further details on this subjec...

Страница 16: ... WARNING If a loose metal object such as a wrench or pen gets too close to the magnet it can become a projectile as the force of the magnetic field pulls the object towards the magnetic center This metal projectile can seriously injure anyone standing between it and the magnet WARNING Ferromagnetic metals are sometimes used in surgical implants and prosthetic devices The magnetic field can twist m...

Страница 17: ... risk not only at the same floor as the magnet but also at the levels above and below the magnet Enforce the exclusion zone with a combination of warning signs and physical barriers The following figure shows the warning sign recommended by Agilent Technologies NOTE National and state legislation requirements differ around the world In the USA follow the requirements and guidance issued by the Foo...

Страница 18: ... houses the magnet The magnetic attraction zone threshold is usually at a magnetic field strength of 30 gauss Occupational exposure to magnetic fields Consult national and state enforcement and advisory bodies to ensure that any exposure limits are not infringed for nonpatient occupational workers NOTE At magnetic field strengths of approximately ten gauss or more magnetic media can become wiped o...

Страница 19: ...flammable and nontoxic In order to remain in a superconducting state the magnet is immersed in liquid helium Nitrogen is a naturally occurring gas that becomes liquid at approximately 77K It is also colorless odorless nonflammable and nontoxic It is used to cool the shield that surrounds the liquid helium reservoir During normal operation liquid cryogens evaporate and require replenishment on a re...

Страница 20: ... To prevent cryogenic burns wear safety footwear protective gloves and a face shield Long sleeved clothing and long trousers or pants are also recommended During the filling process atmospheric air condenses on the fill line or pipes leaving an oxygen rich liquid or even liquid oxygen If this drips onto a combustible material like oil or grease it can cause a fire For these reasons note the follow...

Страница 21: ...isk of asphyxiation can still occur during a quench A quench occurs when the magnet loses its superconductivity and warms the liquid helium causing it to turn to gas This large amount of gas escapes through the magnet venting The following section describes the safety recommendations that prevent the possibility of asphyxiation after a magnet quench WARNING Helium or nitrogen gas released in an ar...

Страница 22: ...prevent this situation from happening in all atmospheric conditions and winds Although quenches are short lived and infrequent phenomena However as quench gases are liberated the temperature of the quench duct can become low enough to cause cold burns on unprotected skin This cold can also damage electrical wiring or other services routed close enough to touch the quench duct Do not route water pi...

Страница 23: ...nitor sounds an alarm when the oxygen level in the room rises above or falls below a safe level This alarm happens if the ventilation system malfunctions either during a quench or during a normal boil off and a large Table 1 Examples of gas generation Magnet Type Quantity of liberated N2 gas during precool Time taken to liberate N2 gas during precool Quantity of liberated He gas during filling Tim...

Страница 24: ...utine maintenance involving transfer of cryogens Advice If you have any queries concerning your siting requirement advice can be obtained from the Installation Manager at Agilent Technologies WARNING For safety reasons allow only personnel with formal maintenance training to perform routine maintenance tasks involving transfer of cryogenic liquids ...

Страница 25: ...WARNING For continued protection against risk of fire or electric shock always replace fuses with the same type rating and UL listing CAUTION Magnets power supplies contain internal protection fuses follow the guidelines in the trouble shooting section of the magnet manual before replacement of these devices CAUTION Your magnet power supply has been preset to a voltage range suitable for the natio...

Страница 26: ...ntial for installation work Normal ladders and stepladders are not best suited to this task They often fail to offer a secure platform when working on top of magnets and performing tasks that require the use of both hands Select and purchase suitable access equipment before the arrival of the magnet Make sure that all equipment is nonferrous and immune to magnetic attraction To aid in choosing the...

Страница 27: ...onferromagnetic construction Otherwise it can become attracted to the magnet causing personal injury and becoming useless for fire fighting purposes Large fires Most premises already have fire and emergency procedures in place in accordance with current safety legislation For maximum safety invite the Fire Department or Fire Brigade for a liaison visit to inspect the building layout and the hazard...

Страница 28: ...magnets very close to or enveloped in flames get very hot causing them to quench and rapidly release inert gases possibly faster than their pipes and fittings normally permit In the worse case a magnet can become over pressurized and explode If magnets become physically hot in a fire Treat them in a similar way to hot compressed gas cylinders hosed down and kept cool Fire Doors and Exits Make sure...

Страница 29: ...tent with the volume of cryogens being used If the oxygen level in the room falls below 19 5 do not allow personnel to enter the area without self contained breathing apparatus or airline respirators Do not smoke Ensure that other sources of ignition are not present Liquid oxygen can condense on cold surfaces and cause a fire hazard Never measure the helium level by dipping or thumping the helium ...

Страница 30: ...or example directly underneath and on top of vertical magnets and at each end of horizontal magnets In the rare event of a magnet quench it is possible for the magnetic field to bloom momentarily beyond its normal limit attracting ferromagnetic objects towards the magnet For this reason do not place or store ferromagnetic objects within 1 meter of the cryostat CAUTION Keep all forms of magnetic st...

Страница 31: ...th the system MUST be leveled and bolted to the floor using the relevant holes in the base fixing plate Perform this operation at the beginning of the magnet installation before the magnet is energized Do not stand on the legs hoods at any time to avoid affecting the stability of the system Protective leg hood covers are fitted to prevent this situation from happening ...

Страница 32: ...30 400 54 Premium Shielded NMR Magnet System Product Overview 2 Installation and Operation Safety ...

Страница 33: ...400 54 Premium Shielded NMR Magnet System System Overview Agilent Technologies 3 Maintenance Commissioning and Decommissioning the Magnet 32 Cryostat Maintenance 35 Cryogenic Fills 38 Parts List and Order Form 50 ...

Страница 34: ...owing table for a list of all of these transit features Space is provided in this table to record the storage location of each item for future reference Decommissioning of the magnet Only allow suitably trained personnel to move or ship the magnet If all the transits are not correctly fitted on the system or if it is packed or shipped incorrectly the system can be damaged Contact Agilent Technolog...

Страница 35: ...nuously observing the needle Keep the compass away from the magnetized elements because they can demagnetize the compass needle 3 Proceed as described above The N end of the needle must point to the bottom of the magnet pointing up the bore tube from the floor This is the S end of the magnet The reverse is checked at the top of the magnet the S end of the needle must point down towards the bore tu...

Страница 36: ...34 400 54 Premium Shielded NMR Magnet System Product Overview 3 Maintenance Figure 2 Magnet orientation ...

Страница 37: ...that all safety valves are free and are not iced up Check that all seals are air tight especially after a helium top up Check that the cryogen levels in the log are consistent dropping regularly If ice develops on the helium probe a false reading can occur and the level will cease to drop If this is suspected contact Agilent Technologies for advice Monthly and annually for systems with fitted quen...

Страница 38: ... with compression seals The correct compression seal arrangement is shown in the following figure Figure 3 Compression seal arrangement Cryogen and service log It is good practice to keep a log of cryogen usage and maintenance An increase in cryogen consumption over time can indicate that the vacuum space needs to be repumped A reduction in boil off can indicate a leak or blockage In addition it i...

Страница 39: ... the beginning of this manual In order to avoid any difficulties and potential safety issues use only Agilent Technologies approved parts on the system Table 3 Cryogen and service log example Date Helium Nitrogen Notes Service details Level probe Quantity used for refill Level probe Quantity used for refill 3 Nov YY 27 20 1 Dec YY 22 20 3 Jan YY 18 10 3 Feb YY 13 10 5 Mar YY 9 10 3 Apr YY 99 60 li...

Страница 40: ...se a fire hazard Never measure the helium level in the magnet cryostat by dipping or thumping the helium can WARNING Do not let the pressure in the nitrogen can exceed 5 psi Ensure that the transport vessel has suitable pressure control The procedure given in this section assumes that there is some liquid nitrogen left in the nitrogen can Cooling and filling an empty nitrogen can requires addition...

Страница 41: ...more expensive was the most effective at improving nitrogen transfer efficiency Use a suitable waterproof tape to preserve the integrity of the insulation and to prevent air water ingress into the lagging at the joints and the ends All insulation freezes during the nitrogen transfer and if moved when cold it cracks Repeated freeze thawing also degrades the insulation Allow the insulation to thaw b...

Страница 42: ...vided for your reference to locate near the magnet This system has two helium turrets one with 10 pin seals fitted the other with none Fill from the side without the 10 pin seals recommended However if logistically difficult you can perform top ups from the other side provided sufficient care is taken not to damage the electrical wires in the neck Figure 4 Recommended turret for helium fills For t...

Страница 43: ...ONMAGNETIC storage Dewar available to fill the helium can entirely plus transfer losses normally transfers are 75 to 85 efficient The liquid level in the helium transfer Dewar NOT the magnet is determined with a dipstick or thumper tube This part is only included with selected products however they are available for purchase from Agilent Technologies WARNING Make sure all the nitrogen ports are we...

Страница 44: ...nce Figure 6 Location of nitrogen ports 2 Check that all seals on the helium manifold are correctly fitted and tight before starting Figure 7 Locations of helium manifold seals 3 Set the cryogen monitor for the helium to read on Fill mode See monitor manual for instructions ...

Страница 45: ...h them all of the way to the top of the siphon leg the junction with the right angled bend Figure 8 Fitting of adapter and fittings to the siphon 5 Fit the phase separator or deflector tip part number DTU400032 to the bottom of the siphon leg to go into the helium can If necessary fit the siphon extension piece to the siphon leg that will be inserted into the Dewar Figure 9 Phase separator connect...

Страница 46: ...ouple of minutes The liquid vaporizes immediately on contact with air If during this process the transfer line develops frost or is cold to touch then the transfer siphon may have insufficient vacuum or may be damaged If insufficient vacuum is suspected then stop the helium fill until the problem with the transfer siphon is resolved If there is insufficient vacuum in the transfer siphon then pump ...

Страница 47: ...move the helium nonreturn valve from the manifold 11 Remove the fill side bung and baffle assembly and insert the siphon and adapter assembly screwing down the nut to ensure a good compression seal CAUTION Failure to precool the siphon can quench the magnet as the warm siphon is inserted into the helium can If the siphon is suspected to be soft or have a touch do not insert into the helium can as ...

Страница 48: ...turn valve and fill side bung and baffle assembly Figure 13 Insert siphon and adapter assembly 12 Gently push the siphon into the helium can until you feel it touch a barrier connector Then withdraw it about 50 mm 2 inches 13 Continually monitor the helium level to ensure that the fill is progressing well ...

Страница 49: ...r for a helium transfer 14 When full take the pressure off the transfer Dewar to stop the transfer 15 Refit the helium nonreturn valve to the manifold Figure 15 Helium siphon in the transfer Dewar showing it lifted from the base of the Dewar 16 Inspect the bung and baffle assembly for damage and ensure that it is warm and dry no water droplets before refitting ...

Страница 50: ...aightened then consider a replacement set You can order a replacement set using the parts order form in Parts List and Order Form on page 50 The use of damaged baffles or omitting the baffles completely can result in reduced performance of the system Figure 16 Replacing bung and baffle assembly 18 Remember to change the helium probe reading back to normal again 19 Once the turret and top hat assem...

Страница 51: ...iciency of the cryostat in normal operation it is common for the helium and or nitrogen boil off to fall to zero immediately after a transfer or after magnet energization There is then a serious risk of air entering the helium and or nitrogen reservoir However if the procedures in this guide are followed correctly you can avoid any associated problems ...

Страница 52: ...nd then fax or send them to the Sales Department at Agilent Technologies for quotation The parts listed are the general consumables and ancillaries required for normal operation Contact the service department for any other parts required Remember to copy both the order form and the contact details and send them to the Sales Department For addresses fax numbers and telephone numbers see Contact Inf...

Страница 53: ...inum NW25 centering ring with Viton O ring fitted Manifold O ring seals DUC400015 Seal nut for P170OR3050 DTU400032 Phase separator DUC400007 Seal nut 25 4mm for P170OR3100 KQ25AW Black NW25 wing nut clamp for KC25AV ANC300397 Single nitrogen port ice preventor heatsink with non return valve fitted ANC345286 Nitrogen port double heatsink and gas flow gauge assembly AHC340869 Nitrogen turret fillin...

Страница 54: ...e C0557001 E5025 Cable PSU 2V 15W short C0608040 E5025 interface connection cable AZZ346425 Helium dipstick for use in helium storage dewar only ATU327906 5m Nitrogen transfer line flare fitting optional longer length P200000041 3 Burst disk 5psi for optional quench manifold ...

Страница 55: ... fax this information sheet with your order to the Sales Department at Agilent Technologies at the Fax number or address listed in Contact Information on page 9 Magnet Serial Number see serial number plate on cryostat or system manual Name Site Contact Address Telephone number Fax number Email address ...

Страница 56: ...54 400 54 Premium Shielded NMR Magnet System Product Overview 3 Maintenance ...

Страница 57: ...NMR Magnet System System Overview Agilent Technologies 4 Reference Nitrogen Probe Calibration Chart 400 54 Premium Shielded 56 Helium Probe Calibration Chart 400 54 Premium Shielded 57 Temperature Sensors 400 54 ASP 59 Wiring Diagram 60 ...

Страница 58: ...n probe calibration chart Nitrogen probe digital readout Height range on probe for digital reading mm Volume range remaining l min max min max 0 0 15 0 0 3 0 5 15 45 3 0 6 0 10 45 74 6 0 9 1 15 74 104 9 1 12 1 20 104 134 12 1 15 2 25 134 163 15 2 18 2 30 163 193 18 2 21 3 35 193 223 21 3 24 3 40 223 252 24 3 27 4 45 252 282 27 4 30 4 50 282 312 30 4 33 5 55 312 342 33 5 36 5 60 342 371 36 5 39 6 6...

Страница 59: ... 8 100 455 532 122 4 95 433 515 117 7 90 412 494 111 6 85 390 472 105 5 80 368 450 100 3 77 353 435 96 1 Min level for energizing shimming 75 346 428 94 2 70 325 407 88 1 65 303 385 83 3 60 281 363 78 4 55 259 341 73 6 50 238 320 68 7 45 216 298 63 9 40 194 276 59 0 35 172 254 54 2 30 151 233 49 4 25 129 211 44 5 20 107 189 39 7 10 64 146 30 0 5 42 124 25 1 0 20 102 20 3 Min Refill Level 20 16 98 ...

Страница 60: ...0 54 Premium Shielded NMR Magnet System Product Overview 4 Reference There is a dead volume between the top of the helium can and the top of the helium level probe that is not shown by the helium level meter ...

Страница 61: ...liquid helium temperatures Platinum resistor thermometers PT100 These sensors have a nominal resistance of 100 Ohms at 0 C 273K which falls linearly to a typical resistance of 20 Ohms at 77K Allen Bradley temperature sensors Allen Bradley temperature sensors are individually calibrated and are specific to each system Location of temperature sensors The temperature sensors fitted to this system are...

Страница 62: ...duct Overview 4 Reference Wiring Diagram 10 pin seal pin designations 400 54 ASP Figure 18 Pin Arrangement in the 10 pin connectors on the magnet Table 7 OVC 10 pin seal Pin Function A GCS AB270 I B GCS AB270 V C D GCS AB270 V E GCS AB270 I F H J K L ...

Страница 63: ...PT100 I H Baseplate PT100 V J Baseplate PT100 I K B0 Shim Switch Heater L B0 Shim Switch Heater Table 9 Black 10 pin seal nut on helium turret black wire Pin Function A Fixed Helium Probe V B Fixed Helium Probe I C Fixed Helium Probe V D Fixed Helium Probe I E Spare Helium Probe V F Spare Helium Probe I H Spare Helium Probe V J Spare Helium Probe I K Baseplate Allen Bradley L Baseplate Allen Bradl...

Страница 64: ...roduct Overview 4 Reference Figure 19 View directly down onto the current lead turret showing positions of the three 10 pin connectors 19 way shim socket pin designations 400 54 ASP Figure 20 Pin Arrangement in the 19 way connector on the shim lead ...

Страница 65: ...Switch Heater C X Switch Heater D Y Switch Heater E ZX Switch Heater F ZY Switch Heater G XY Switch Heater H X2 Y2 Switch Heater J Switch Heater Common K B0 Series Switch Heater L Z3 Switch Heater M Main Switch Heater N B0 Switch Heater P Magnet Volts R Magnet Volts S Shim Current Circuit T Shim Current Circuit U Shim Current Circuit V Shim Current Circuit ...

Страница 66: ...64 400 54 Premium Shielded NMR Magnet System Product Overview 4 Reference ...

Страница 67: ...lent Technologies 5 Agilent E5025 Cryogen Monitor Safety 66 Compliance Notice 67 Overview 68 Description and Operating Principle 70 The Top Level USER Menu 73 The Secondary Level SET UP Menu 75 Cryogen Monitor User Interface 79 Errors and Alarms 85 Ethernet Communication 86 ...

Страница 68: ...y Refer to accompanying documents WARNING This equipment must be connected to an earthed mains supply For continued protection against risk of fire or electric shock replace fuses with the same type rating and UL listing CAUTION This equipment is not suitable for use in areas with flammable mixtures ...

Страница 69: ... low voltage directives of the European Community This unit is to be installed and operated as detailed Any modification or maintenance procedure undertaken which is not approved by Agilent Technologies UK Ltd could nullify the marking of this product and lead to prosecution A Declaration Of Conformity in accordance with the above directive has been made and is located at Agilent Technologies Yarn...

Страница 70: ...t systems The following figure shows a cross section of a typical vertical bore magnet system The liquid helium and nitrogen cryogen levels are displayed in terms of the percentage of refill volume remaining F 100 reservoir is full 0 refill is required now Figure 21 Helium and Nitrogen refill volumes This instrument mounts on the nitrogen level probe on top of the magnet shown in the following fig...

Страница 71: ...ored in a circular buffer This buffer can be downloaded from the unit over an Ethernet link Helium readings are automatically acquired every eight hours or once a day and can also be manually acquired at any time The unit also has a helium filling mode where measurements are performed every 30 seconds This mode is useful for providing up to date level readings during helium top ups however it is n...

Страница 72: ...isplay mode displays the level of both nitrogen and helium in of remaining refill volume Figure 23 The E5025 front panel The buttons on the front panel have the following functions The nitrogen level is shown on the left side of the display and measures in 5 increments with 100 full being displayed as F Once the level reaches the 5 increment the nitrogen display flashes to indicate a low level The...

Страница 73: ...ers of the E5025 have access to a number of set up items via the front panel buttons Two menu levels provide a top level user menu and a secondary level set up menu Each menu is traversable in the down direction only Note when pressing the buttons on the display A finger on or off button delay of about 1 3 second is implemented therefore do not press buttons too quickly A flashing display indicate...

Страница 74: ...vels are refreshed every cycle 5 secs and recorded every eight hours or manual reading coincident with the helium readings He level levels are recorded every 8 hours during normal operation and every 30 seconds during fill mode Nitrogen refill volume display resolution 0 to 100 in 5 steps 0 bottom of refill volume F 100 or full Display reading level flashes for levels 5 Helium refill volume displa...

Страница 75: ...ompleted the unit reverts to the cryogen display mode with the updated readings If both probes are on then P1 is displayed as default unless set otherwise from the set up menu If only one probe is switched on then the selected probe is displayed Changing to the Helium Fill mode From the cryogen display mode press the button once The unit displays rEAd Press once to scroll down the menu to display ...

Страница 76: ...p since the nitrogen display is updated with a new nitrogen level measurement approximately every 5 seconds during normal operation Checking both Helium probe readings If both helium probes are ON then the option HELiU is available by pressing twice to scroll down the menu Selecting this option makes the unit display the most recent helium level measurement for each probe consecutively P1 first fo...

Страница 77: ... section describes each item in the secondary level SET UP menu in the order they appear on the display To change a value for any function 1 Press to select the function when it appears on the display 2 When the current value is displayed press the and buttons as necessary to select the desired value 3 Press to save the new value and exit to the Cryogen Display mode 4 You may be presented with a p...

Страница 78: ... both helium probes Note that this value does not include the heater length P1 rES The resistivity of the probe wire in Ohms m P1 on Enables the P1 helium probe P1 oFF Disables the P1 level probe It is useful to be able to deselect a probe if it is faulty and causes the unit to flash a warning on the display permanently When selected the monitor displays the P2 reading If both probes are disabled ...

Страница 79: ... nitrogen level probe The nitrogen reading is displayed as oFF CAL n2 Performs a calibration of the nitrogen probe Make sure that the nitrogen vessel is FULL when the routine is run Otherwise it will calibrate incorrectly The unit displays CAL n2 during calibration then returns to Cryogen Display mode FAC CAL Recalls the factory saved calibration values It does not reset the P1 or P2 display setti...

Страница 80: ...remaining commands are used to set the helium probe calibration parameters P1 SEC P1Cur rEFiLL and P1Len to any of a number of preset magnet types such as 489ASP for the Premium Shielded 400 MHz 89 mm magnet If you must reset the profile refer to the System Section of the magnet manual for the correct profile name ...

Страница 81: ...n the background or with a graphical user interface It is responsible for periodically querying the Cryogen monitor hardware for cryogen levels and writing the results to a history file This file can be used to construct plots and other data presentation features used by all application modes that support a user interface Nonserver execution modes In nonserver modes the user interface is chosen au...

Страница 82: ...ser interface application outside of VnmrJ 1 Enter the following in a command shell vnmr bin cryomon vnmrj vnmrj is an optional argument that causes the interface to adopt the same look and feel as when the interface is opened from VnmrJ Otherwise the currently selected system theme is used Reader mode user interface When the Cryogen Monitor application is opened in reader mode the following main ...

Страница 83: ...ile and updates any open plots and date event values Under normal operation this reading is only done when the application starts up or every hour while the interface is open Date Time events This pull down menu and associated text field can be used to display one of three cases Fill green The level where the Cryogen is scheduled to be refilled during normal maintenance Warn yellow Indicates that ...

Страница 84: ...ent capacity and the horizontal X axis shows time and date The three colored traces fill warn and alert show the corresponding levels and can be set independently for N2 and He from the master application interface Resize the plot windows by dragging one of the four corners following a left mouse button click To expand a region of the data zoom in draw a rectangle in a down right direction using a...

Страница 85: ...the background If no server is running you are prompted to start one Answer Yes to start a new server instance Figure 26 Prompt to start cryogen monitor service The main user interface panel in Writer mode is similar to that of the Reader mode interface The only difference is the presence of an Options menu which allows you to access the set of advanced feature controls described in the next secti...

Страница 86: ...History controls The MaxDays field can be used to change the maximum number of days that the software saves level and status history The default value is 1000 days Clicking Clear causes the history file to be reset so that it contains only its last entry Server status The Server status button displays whether a server application is currently active in the background This is displayed if such a pr...

Страница 87: ...cycles 15 seconds to accept a new menu value and remeasure Then on the final cycle error conditions are reassessed Nitrogen errors or alarms cause the left side of the display to flash Helium errors or alarms cause the right side of the display to flash When the entire display flashes there is a problem with both cryogens When the display is flashing an error the display is periodically held stead...

Страница 88: ...n Ethernet cable which can be used to connect the E5025 unit to the VNMRS console Ethernet communication is primarily via Telnet port 23 over TCP IP protocol The E5025 also responds to ICMP ping requests The unit can be set to two different address profiles via the front panel Profile A Profile B IP address 10 0 0 241 172 16 0 241 Gateway 10 0 0 1 172 16 0 1 Subnet mask 255 255 255 0 255 255 255 0...

Страница 89: ... Premium Shielded NMR Magnet System System Overview Agilent Technologies 6 Technical Specifications System Description 88 The Superconducting Magnet 89 The Cryostat 92 Customer Interface Drawings 94 System Components 96 ...

Страница 90: ...ilizes Agilent Premium Shielded magnet technology which features outstanding fringe field containment to minimize laboratory space requirements External field perturbations are efficiently attenuated Pneumatic antivibration support legs are supplied as standard across the product line to allow siting in a wide range of environments ...

Страница 91: ...or NbTi materials ensure the best field stability Inevitably winding tolerances and small amounts of environmental influence distort the central field Corrections for these distortions are made in the first instance by superconducting shim coils located on a former surrounding the main coil Final corrections are made by room temperature correction coils placed in the bore of the system supplied by...

Страница 92: ...field Less than 160 min Stored Energy 0 18 MJ Fringe field 5 Gauss line 0 55 m radially and 1 0 m axially WARNING In the event of a quench it is possible for the magnetic field to momentarily bloom beyond this limit For further details consult the Safety Considerations for the Installation and Operation of Magnet Systems document Table 12 Coil details Shims provided Z0 Z1 Z2 Z3 X Y ZX ZY XY X2 Y2 ...

Страница 93: ...Technical Specifications 6 400 54 Premium Shielded NMR Magnet System Product Overview 91 Figure 29 Fringe field ...

Страница 94: ...nsfer siphon The outer vessel has a bottom flange closure constructed from aluminium which is sealed to the main body and bore tube by compressed o ring seals The system is designed to be shipped without disassembly to facilitate quicker and easier installation Specifications The cryostat is generally as shown in drawing CNZ331842 Issue F System finish Dimensions See customer interface drawings Ta...

Страница 95: ...oling the magnet from 77K to 4 2K plus the volume required to completely fill Helium reservoir and to refill Helium reservoir after magnet energization 400 liters approx Recommended helium refill volume during normal operation 95 liters Helium hold time during normal operation static magnetic field leads withdrawn 270 days Table 17 Liquid nitrogen Total volume of nitrogen required for installation...

Страница 96: ...94 400 54 Premium Shielded NMR Magnet System Product Overview 6 Technical Specifications Customer Interface Drawings Figure 30 CNZ331842F drawing 1 of 2 ...

Страница 97: ...Technical Specifications 6 400 54 Premium Shielded NMR Magnet System Product Overview 95 Figure 31 CNZ331842F drawing 2 of 2 ...

Страница 98: ...rd parts provided with system Qty Description Part number 1 ea Standard manifold and safety valve assembly 1 ea Helium fill adapter seal nut washer and O rings 1 set Transit fittings 1 ea System manual 9100380100 1 ea Nitrogen level probe AUE334195 1 set Heat sink and flow meter assembly ANC345286 1 set Helium transfer siphon and extension tube P22200072 1 set Transfer siphon maintenance parts AKZ...

Страница 99: ......

Страница 100: ...Agilent Technologies Agilent Technologies Inc Printed in USA April 2012 9100380100 9100380100 ...

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