RS
Service Manual
NMR Spectroscopy
Copyright © by Bruker Corporation
All rights reserved. No part of this publication may be
reproduced, stored in a retrieval system, or transmitted, in any
form, or by any means without the prior consent of the publisher.
Product names used are trademarks or registered trademarks of
their respective holders.
© May 2011: Bruker Corporation
Fällanden, Switzerland
ZTKS0156 / Z31820 / Rev.: 03
For further technical assistance on the NMR magnet system,
please do not hesitate to contact your nearest BRUKER dealer
or contact us directly at:
BRUKER Corporation
Industriestrasse 26
CH - 8117 Fällanden
Switzerland
Phone:+ 41 44 825 91 11
Fax: + 41 44 825 96 96
E-mail:service@bruker.ch
Internet:www.bruker.com
0 Contact ...........................................................................................................9
1 Introduction..................................................................................................11
2 Safety............................................................................................................15
3 Transportation .............................................................................................31
4 Assembling ..................................................................................................37
5 Operation......................................................................................................79
6 Troubleshooting ..........................................................................................87
7 Maintenance...............................................................................................113
8 Disassembling ...........................................................................................121
A Appendix ....................................................................................................133
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4
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Table of Contents
0 Contact ...........................................................................................................9
1 Introduction..................................................................................................11
1.1 General Information................................................................................................ 11
1.2 Limitation of Liability ............................................................................................... 11
1.3 Customer Service................................................................................................... 11
1.4 Warranty................................................................................................................. 11
1.5 Copyright ................................................................................................................ 11
1.6 General View.......................................................................................................... 12
2 Safety............................................................................................................15
2.1 Approved Persons.................................................................................................. 15
2.2 Customer Responsibilities...................................................................................... 16
2.3 Key Words.............................................................................................................. 17
2.4 Residual Risks........................................................................................................ 18
2.4.1 Persons .................................................................................................................. 18
2.4.2 Intended Use .......................................................................................................... 18
2.4.3 Safety Devices ....................................................................................................... 19
2.4.4 Spare Parts ............................................................................................................ 19
2.4.5 Signs and Labels.................................................................................................... 20
2.4.6 Technical Risks ...................................................................................................... 20
2.5 Personal Protective Equipment .............................................................................. 26
2.6 Description of Signs and Labels............................................................................. 27
2.7 Safety Devices ....................................................................................................... 28
2.8 Behavior in Danger and Emergency Situations...................................................... 30
2.9 Fire Department Notification................................................................................... 30
3 Transportation .............................................................................................31
3.1 Safety ..................................................................................................................... 31
3.2 Packaging............................................................................................................... 31
3.2.1 Disposal.................................................................................................................. 32
3.3 Transport Inspection............................................................................................... 32
3.4 Transportation by Fork Lift / Pallet Jack ................................................................. 33
3.5 Transportation with a Crane ................................................................................... 34
3.6 Storing .................................................................................................................... 35
4 Assembling ..................................................................................................37
4.1 Safety ..................................................................................................................... 37
4.2 Assembling Workflow ............................................................................................. 39
4.3 Assembling Work ................................................................................................... 40
4.3.1 Preparing the Cryostat ........................................................................................... 40
4.3.1.1 Removing the Transportation Locks....................................................................... 40
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Table of Contents
4.3.1.2 Mounting the Getter Container ............................................................................... 43
4.3.1.3 Checking the Feedthrough Plate ............................................................................ 44
4.3.1.4 Assembling the Nitrogen Tube ............................................................................... 44
4.3.1.5 Assembling the RT Tube ........................................................................................ 46
4.3.1.6 Checking and Fitting the Drop-off Plate.................................................................. 49
4.3.2 Evacuating the Cryostat ......................................................................................... 50
4.3.2.1 Mounting the Vacuum Valve................................................................................... 50
4.3.2.2 Mounting the Vacuum Valve at Evacuated Cryostat .............................................. 51
4.3.2.3 Generating the Vacuum.......................................................................................... 52
4.3.2.4 Rebuilding the Vacuum .......................................................................................... 53
4.3.2.5 Removing the Vacuum Valve ................................................................................. 53
4.3.3 Mounting the Cryogenic Refrigerator Parts ............................................................ 54
4.3.3.1 Mounting the Cold Head......................................................................................... 54
4.3.3.2 Mounting the Rotary Valve Column........................................................................ 56
4.3.3.3 Mounting the Rotary Valve and Flex Lines............................................................. 61
4.3.3.4 Mounting the Compressor ...................................................................................... 67
4.3.3.5 Mounting the Helium Level Sensor......................................................................... 69
4.3.3.6 Mounting the Helium Flow System ......................................................................... 70
4.3.3.7 Mounting the Temperature Control......................................................................... 71
4.3.4 Cooling down from 300 K to 80 K........................................................................... 73
4.3.5 Cooling down to 4.2 K ............................................................................................ 77
5 Operation......................................................................................................79
5.1 Safety ..................................................................................................................... 79
5.2 Energizing............................................................................................................... 80
5.2.1 Inserting the Current Lead ...................................................................................... 80
5.2.2 Energizing Procedure............................................................................................. 81
5.2.3 Cycling Procedure .................................................................................................. 82
5.2.4 Shimming Procedure .............................................................................................. 83
5.2.5 Removing the Current Lead ................................................................................... 84
5.2.6 Complete Energizing .............................................................................................. 84
5.3 Set into Operation................................................................................................... 85
6 Troubleshooting ..........................................................................................87
6.1 Safety ..................................................................................................................... 87
6.2 Problem .................................................................................................................. 88
6.2.1 During Transportation............................................................................................. 88
6.2.2 During Assembling ................................................................................................. 88
6.2.3 During Cool Down .................................................................................................. 90
6.2.4 During Energizing and Shimming........................................................................... 94
6.2.5 During Operation of the Magnet Stand ................................................................... 96
6.2.6 During Standard Operation..................................................................................... 98
6.2.7 During De-energizing and Warming up ................................................................ 101
6.2.8 During Operation of the Cryogenic Refrigerator ................................................... 102
6.3 Troubleshooting Work .......................................................................................... 107
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Table of Contents
6.3.1 After a Quench ..................................................................................................... 107
6.3.2 Replacement of the Helium Level Sensor ............................................................ 109
6.3.3 Procedure in case of an alarm signal................................................................... 110
6.3.4 Procedure in case of Cryogenic Refrigerator failure ............................................ 111
7 Maintenance...............................................................................................113
7.1 Safety ................................................................................................................... 113
7.2 Cleaning ............................................................................................................... 114
7.3 Maintenance Timetable ........................................................................................ 114
7.4 Maintenance Work at the Cryogenic Refrigerator ................................................ 116
7.4.1 Service Kit ............................................................................................................ 116
7.4.2 Flex Lines ............................................................................................................. 117
7.4.3 Replacement of the Rotary Valve and the Cold Head.......................................... 118
8 Disassembling ...........................................................................................121
8.1 Safety ................................................................................................................... 121
8.2 Disassembling Work............................................................................................. 123
8.2.1 De-energizing ....................................................................................................... 123
8.2.2 Warming up from 4.2 K to 300 K .......................................................................... 124
8.2.3 Breaking the Vacuum ........................................................................................... 125
8.2.4 Removing of the Helium Flow System ................................................................. 126
8.2.5 Removing the Cryogenic Refrigerator Parts......................................................... 126
8.2.6 Removing of the RT Tube and the Nitrogen Tube ............................................... 127
8.2.7 Assembling of the Transportation Lock ................................................................ 129
8.2.8 Remount the Magnet Stand ................................................................................. 131
8.2.9 Prepare the Cryostat for Transportation............................................................... 131
A Appendix ....................................................................................................133
A.1 Warning Signs ...................................................................................................... 135
A.2 Figures ................................................................................................................. 137
A.3 Tables................................................................................................................... 141
A.4 Glossary / Abbreviations ...................................................................................... 143
A.5 Technical Data USR Service................................................................................ 145
A.6 Index..................................................................................................................... 153
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Table of Contents
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ZTKS0156 / Z31820 / Rev.: 03
0Contact
Manufacturer:
Bruker BioSpin AG
Industriestrasse 26
CH-8117 Faellanden
Switzerland
Phone: +41-44-825-91-11
Fax: +41-44-825-96-96
http://www.bruker.com
E-mail: service@bruker.ch
Please refer to the Model No., Serial No. and Internal Order No. in all correspondence
regarding the NMR system or components thereof.
ZTKS0156 / Z31820 / Rev.: 03
9
Contact
10
ZTKS0156 / Z31820 / Rev.: 03
1 Introduction
1.1 General Information
This manual contains important information about the handling of the supplied magnet
system as a part of the magnet system used for NMR analyses. The compliance with all
safety and handling instructions, the applicable local accident prevention and general
safety regulations are necessary for safe work.
The manual is part of the product. It must be kept in the immediate vicinity of the magnet
system and unimpeded access must be ensured at any time. Read the manual carefully
before handling the magnet system or its components.
1.2 Limitation of Liability
The information in this manual will take into account the current state of the technology.
The manufacturer assumes no liability for damages resulting from:
• non-compliance with the instructions and all applicable documentation,
• use for purposes not intended,
• not sufficiently approved persons,
• arbitrary changes or modifications and
• use of not approved spare parts or accessories.
1.3 Customer Service
Technical support is provided by Bruker service via telephone or e-mail. For contact
information see page 9 of this document.
1.4 Warranty
The warranty terms can be found in the sales documents of the magnet system and in
the Terms and Conditions of Bruker BioSpin AG.
1.5 Copyright
No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means without the prior consent of the publisher. Product
names used are trademarks or registered trademarks of their respective holders.
ZTKS0156 / Z31820 / Rev.: 03
11
Introduction
1. Cryogenic Refrigerator Compressor
(noise protection cover optionally)
2. Cryogenic Refrigerator Flex Lines
3. Rotary Valve (RV) covered by the
Rotary Valve Column (RVC)
4. Connection Line
5. Helium flow system
6. Current lead turret
7. Cryogenic Refrigerator Cold Head
8. Helium fill-in turret with helium fill-in
port
9. RT bore
10. RT vessel
11. Magnet Stand
1.6 General View
12
Figure 1.1: General view RS Cryostat of the Magnet System
ZTKS0156 / Z31820 / Rev.: 03
Introduction
The heart of the NMR magnet system is a superconducting magnet located inside the
helium vessel, which is filled with liquid helium. The helium vessel is surrounded by a
radiation shield (RS) both cooled by a Cryogenic Refrigerator. The outer casing, the
room temperature (RT) vessel (10) contains the helium vessel and the radiation shield.
The vacuum inside the RT vessel reduces thermal conduction. RT vessel, helium
vessel, radiation shield, helium turrets, helium flow systems and the RT bore together
build the cryostat of the NMR magnet system. The RT bore (9) allows the access to the
magnetic centre of the NMR magnet system.
The cryostat is mounted on a magnet stand (8). The isolators in the magnet stand
absorb floor vibrations. Different heights and isolators are available optionally.
The helium turrets (5, 8) build the interface of the helium vessel to the outside. The
current lead turret (5) builds the interface for energizing the magnet coil and for
diagnostic. The helium fill-in turret (8) with access to the siphon and connecting plug for
the helium level sensor is used to fill the helium vessel. It is marked with a yellow label.
The helium flow system (6) connects the two helium turrets.
The Cryogenic Refrigerator is a closed loop helium expansion cycle. It consists of a
Compressor (1), two Flex Lines (2), a Remote Rotary Valve inside the Rotary Valve
Column (RVC; 3), a Cold Head (7) and a Connection Line (4) between Remote Rotary
Valve and Cold Head. The Remote Rotary Valve, Flex Lines, Connection Line and Cold
Head are covered with an applicable noise protection cover. For the Compressor a noise
protection is available optionally.
Depending on the customers site restrictions several opportunities for the additional
equipment of the Cryogenic Refrigerator are possible. Refer to the order subscription
and to the supplied manuals of the supplied equipment.
ZTKS0156 / Z31820 / Rev.: 03
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Introduction
14
ZTKS0156 / Z31820 / Rev.: 03
2 Safety
The supplied cryostat of the magnet system was designed and manufactured according
to best available technical knowledge and practice, archived in over 50 years of experience of Bruker Corporation. International standards for quality and approval recommended for cryostats of superconducting magnets were certified.
Nevertheless non-compliance with the following instructions and safety advice may
cause serious hazards and property damage.
2.1 Approved Persons
Bruker BioSpin AG identifies the following qualifications for personnel performing tasks
on the magnet system or its components:
Approved Customer Personnel:
As a result of professional training by Bruker Service Personnel, experience and
knowledge of applicable regulations these persons are qualified to perform the specific
tasks on the magnet system and its components assigned to them in this manual.
Approved Customer Personnel are qualified to identify possible hazards and risks
associated with the tasks assigned to them and to perform all possible steps to eliminate
or minimize these risks.
Bruker Service Personnel:
These persons are qualified by appropriate qualification and professional training and
experience (including all necessary knowledge of applicable regulations and regulatory
requirements) to perform specific tasks on the magnet system and its components.
Bruker Service Personnel are qualified to identify possible hazards and risks and to
perform all possible steps to eliminate or minimize these risks.
ZTKS0156 / Z31820 / Rev.: 03
15
Safety
2.2 Customer Responsibilities
The customer of the magnet system must obey the security advice and the rules for
safety, accident prevention and environmental protection correctly for the magnet
systems. Furthermore, the customer is responsible for keeping the magnet system in
correct technical condition.
In particular:
• The customer must identify additional dangers resulting from the working conditions
at the site of the magnet system and provide applicable safety measures.
• The customer must ensure that the site plan meets the specified conditions for
operating the magnet system and supplied site planning document.
• The customer must clearly mark the danger area around the magnet system and
post the corresponding instruction plates.
• The customer has to ensure the intended use of the magnet system.
• The customer has to inform the local fire brigade about the special risks of the
magnet system and how to react in the event of an incident.
• The customer must clearly define the responsibilities for operation and maintenance.
• The customer must ensure that all employees working with the magnet system have
read and understood the manual.
• The customer has to provide the necessary personal protective equipment for his
employees.
• The customer has to instruct his employees at regular intervals on hazards and
safety measures.
• The customer has to instruct other persons not working on the magnet system but
carrying out work in the same room, for instance cleaning staff or guards.
• The customer has to consider the specific items of this cryostat equipped with a
Cryogenic Refrigerator. The customer is responsible for obeying the advice given in
this manual. In case the Cryogenic Refrigerator is not running correctly his
immediate reaction is mandatory. In case of an unexpected alarm his immediate
response is mandatory. For further instruction refer to chapter ”Troubleshooting”
on page 6-87.
• The customer must ensure that maintenance is performed according to the
schedule listed in chapter ”Maintenance Timetable” on page 7-114.
16
ZTKS0156 / Z31820 / Rev.: 03
2.3 Key Words
Indicates a hazardous situation which, if not prevented, will result in
death or serious injury.
Indicates a hazardous situation which, if not prevented, could result in
death or serious injury.
Safety
DANGER
WARNING
CAUTION
Indicates a hazardous situation which, if not prevented, may result in
moderate or minor injury.
NOTICE
Hazard, which could result in property damage.
Information and links for efficient and trouble-free handling and operation.
i
ZTKS0156 / Z31820 / Rev.: 03
17
Safety
2.4 Residual Risks
In the following section, the residual risks from the risk analysis according ISO 14971 are
summarized. To prevent health hazards and hazardous situations obey all safety instructions and warnings in the manual.
2.4.1 Persons
Risk of injury and property damage by not approved persons.
Incorrect handling of the magnet system from not approved persons may result in
significant bodily injury and property damage.
Thus:
• Work must only be carried out by approved persons with applicable qualifications.
The necessary qualifications are specified in the beginning of the relevant
chapter.
WARNING
• In case of doubt, contact Bruker Service. Contact information see page 9 of this
document.
2.4.2 Intended Use
The supplied magnet systems is designed and intended for NMR spectroscopy only.
Risk of damage to life and limb by incorrect use of the magnet system.
Incorrect use of the magnet system can lead to life-threatening situations and
destruction of the magnet system.
Thus:
• Only use the magnet system as intended.
• Do not change the magnet system.
• Do not exceed specified values for operating the magnet system.
• Do not use inserts inside the RT bore not approved by Bruker Service.
WARNING
18
Damage claims from damages caused by other than the intended use of the magnet
system are excluded and the customer is held liable.
ZTKS0156 / Z31820 / Rev.: 03
2.4.3 Safety Devices
Risk of damage to life and limb due to not sufficient safety devices.
Several safety devices ensure safe operation of the magnet system. They must
always be in correct working condition.
Thus:
• Do not block safety devices.
• Do not remove safety devices.
• Check the operational reliability of the safety devices before working on the
magnet system.
Safety
WARNING
2.4.4 Spare Parts
Risk of injury and property damage from using incorrect or defective
spare parts and accessories.
Incorrect or defective spare parts can cause serious injuries. They may cause
damaging, malfunctioning and the destruction of the magnet system.
Thus:
• Only use original equipment manufacturer spare parts.
• Only use original equipment manufacturer accessories.
WARNING
ZTKS0156 / Z31820 / Rev.: 03
19
Safety
2.4.5 Signs and Labels
Risk of damage to persons and property due to not readable signs and
labels.
Signs and labels with advice may become not readable.
Thus:
• Maintain signs and labels in a readable state.
• Replace damaged or not readable signs and labels immediately. New signs and
labels can be obtained from Bruker Service.
WARNING
2.4.6 Technical Risks
Magnetic Field
Risk of damage to life and limb due to high magnetic fields.
A magnetic field of more than 0.5 mT (5 Gauss) is life-threatening for people with
pacemakers or metal implants. Ferromagnetic tools in the magnetic field are
significantly hazardous. Disks and electronic devices may be damaged. Duration of
exposure (8 h/day) above the limit of 200 mT can cause damage to health.
Thus:
• Mark the magnetic field of more than 0.5 mT (5 Gauss) before start up.
• The workplace must be outside the 0.5 mT area.
• Keep people with pacemakers and metal implants away from the identified area.
• Keep disks, credit cards and electronic devices away from the identified area.
• Do not use ferromagnetic tools or items within the identified area.
• Only use non-ferromagnetic transportation dewars for the cryogenic agents.
• Only use non-ferromagnetic ladders or steps.
WARNING
20
ZTKS0156 / Z31820 / Rev.: 03
Safety
Cryogenic Agents
WARNING
Risk of damage to life and limb due to cryogenic agents.
Risk of damage to life and limb due to not correct handling of liquid cryogenic agents
and their dewars. Within the transition from liquid to gas, helium and nitrogen
expands their volume, causing closed vessels to burst.
The evaporating cryogenic agents will displace the air. In case of not sufficient ventilation this may result in death by suffocation. Helium displaces oxygen in the upper
part of the room, nitrogen displaces oxygen in the lower parts of the room.
Liquid and gaseous cryogenic agents are extremely cold. Contact with liquid or
gaseous cryogenic agents will lead to cold burns.
Thus:
• Only use cryogenic agents in well ventilated rooms. In case of doubt ask Bruker
Service.
• Wear an oxygen monitor on the body during service and maintenance work.
• Prevent any skin contact with liquid or gaseous cryogenic agents.
Electricity
WARNING
Risk of damage to life and limb due to electricity.
Risk of damage to life and limb due to contact with electrical lines and damaged
insulation.
Thus:
• Work on electrical equipment must be done by an approved electrical technician.
• Keep moisture away from electrical lines to prevent short-circuits.
• Check the magnet system accidental ground before start up.
• Switch power OFF before working on the Bruker Power Supply or further equipment.
ZTKS0156 / Z31820 / Rev.: 03
21
Safety
Quench
WARNING
Risk of suffocation during a quench of the magnet system.
A quench is the very fast de-energizing of the magnet by loss of its superconductivity.
The stored magnetic energy is converted into heat and thus large quantities of helium
evaporate. The evaporating helium will displace oxygen. In case of not sufficient
ventilation this may result in death by suffocation.
Thus
• The magnet system site must be well ventilated. In case of doubt contact Bruker
Service.
• The evaporating gas may resemble smoke. Never pour water on the magnet
system.
Gas under Pressure
WARNING
Risk of injury due to gas under pressure inside the cryostat and further
equipment.
The helium or the nitrogen vessel of the cryostat may get sealed off due to ice
formation inside the helium or the nitrogen turrets in case of non-compliance with the
instruction given in this manual. This may lead to overpressure and damage of the
helium or the nitrogen vessel.
Manipulations of components with gas under pressure may lead to injury and
property damage.
Thus:
• In case of icing inside the helium or the nitrogen turrets contact Bruker Service
immediately.
• Release the pressure before working on components with gases under pressure.
• Do not seal cryogenic agent vessels of the magnet system or the transport
dewars.
• Do not connect high pressure transport dewars for liquid cryogenic agents to the
magnet system. Completely eliminate the high pressure from the transport
dewars before connecting and transferring.
• Keep the Cryogenic Refrigerator circuit closed at any time. Overpressure can
release in the buffers of the Compressor, the Rotary Valve and the Cold Head.
22
ZTKS0156 / Z31820 / Rev.: 03
Safety
Low Temperatures
WARNING
Risk of injury due to low temperatures of liquids and metal parts.
Physical contact with extremely cold liquids and metal parts may cause serious injuries. Contact with the skin may cause cold burns. Contact with the eyes may cause
blindness.
Thus:
• Always wear protective goggles, protective gloves and protective clothes while
handling with liquid cryogenic agents or metal parts in contact with liquid
cryogenic agents.
• Protect temperature sensitive components such as O-rings from contact with
liquid cryogenic agents.
Spontaneous Ignition and Explosion
WARNING
Risk of injury from spontaneous ignition and explosion caused by
liquid oxygen.
Pure oxygen condenses on extremely cold metal pieces. Together with oil it may
ignite spontaneously. In case of fire the pure oxygen may cause an explosion.
Thus:
• Do not smoke near the magnet system.
• Do not use open flames near the magnet system.
• Keep the environment around the magnet system clean.
• Do not leave oily rags near the magnet system.
Risk of Slippage
WARNING
Risk of injury from slippage.
The accumulation of condensed water on the floor and ladders causes slippery
surfaces.
Thus:
• Always wear safety shoes with an anti slip sole.
• Be careful using ladders.
• Clean floor and ladders regularly.
ZTKS0156 / Z31820 / Rev.: 03
23
Safety
Risk of Tilting
WARNING
Risk of injury due to tilting of the magnet system.
The magnet system is very sensitive to lateral forces. It may tilt.
Thus:
• Do not climb onto the magnet system.
• Do not lean items against the magnet system.
• Do not lean against the magnet system.
• Do not move the magnet system on your own.
Risk of Heavy Weights
WARNING
Risk of damage to life and limb caused from heavy weights.
Lifting heavy weights is life-threatening due to falling or moving parts.
Thus:
• Do not stay or work under a lifted magnet system.
• All used lifting equipment must be approved to carry the weight (see Appendix,
Technical Data).
• Do not use damaged lifting equipment.
• Do not use lifting equipment without updated check tag.
• Lifting only with approved qualification.
• Obey ergonomic guidelines while lifting heavy parts.
• Protect parts against falling.
• Always wear safety shoes with approved toe caps.
24
ZTKS0156 / Z31820 / Rev.: 03
Safety
Risk of Hot Surfaces
WARNING
Risk of injury from contact with hot or cold surfaces.
Surfaces of the Cryogenic Refrigerator parts may be hot. Skin contact with these
surfaces can cause serious injuries.
Thus:
• Any work at the Cryogenic Refrigerator parts must only be performed by Bruker
Service.
• Always wear protective gloves while handling Cryogenic Refrigerator parts.
Transportation
CAUTION
Risk of injury and property damage due to incorrect transportation.
The box may tilt, movement may get out of control. Thus persons may get injured
and the cryostat or further equipment may be damaged.
Thus:
• Be careful while unloading and moving the boxes.
• Do not move the boxes arbitrarily.
• Pay attention to all symbols on the boxes.
• Pay attention to sharp edges and spikes of boxes and parts by using protective
gloves while moving.
• Move the boxes in an upright position.
• Do not tilt the boxes.
• Prevent crossing thresholds, even if they are only a few millimeters high.
• Clean the transportation way before transporting the box.
• Unpack shortly before assembling.
• The cryostat or further equipment must be protected from rain and other bad
weather conditions during transportation.
• Exclusively move the cryostat in its original box.
• Do not remove the tightening straps inside the box until assembling.
• Only use the attachment points provided.
• Ensure that the cryostat is always leveled during any transportation.
• Transportation only with transportation locks attached.
• Do not move the evacuated cryostat.
• Do not move the cryostat after cool down.
ZTKS0156 / Z31820 / Rev.: 03
25
Safety
2.5 Personal Protective Equipment
The personal protective equipment must be worn at any time while working on the
magnet system and to avoid health hazards.
Protective Goggles
Used to protect the eyes from injury due to flying cold liquids and parts.
Protective Gloves
Used to protect the hands from injury caused by contact with extremely cold liquids or
surfaces and for protection from injury caused by rough edges.
Protective Clothes
Used to protect the body from injury caused by contact with extremely cold liquids or
surfaces and for protection from wounds.
Safety Shoes
Used to protect the feet from injury from falling of heavy objects. An anti-slip sole
protects from injury caused by slipping and falling on slippery floor and steps. Only use
safety shoes with non-ferromagnetic toe caps.
Portable Oxygen Monitor and Alarm
Used to warn against low oxygen concentrations in surrounding air.
26
ZTKS0156 / Z31820 / Rev.: 03
2.6 Description of Signs and Labels
Signs and labels are always related to their immediately vicinity. The following signs and
labels are found on the magnet system and in the vicinity.
Prohibition sign: No person with pacemakers!
People with pacemakers are endangered in the identified area of 0.5 mT (5 Gauss) and
are not allowed to enter these areas.
Prohibition sign: No person with implants!
People with metallic implants are endangered in the identified area of 0.5 mT (5 Gauss)
and are not allowed to enter these areas.
Prohibition sign: No watches or electronic devices!
Safety
Watches and electronic devices may be damaged in the identified area of 0.5 mT
(5 Gauss).
Prohibition sign: No credit cards or other magnetic memory!
Credit cards and magnetic memory may be damaged in the identified area of 0.5 mT
(5 Gauss).
Prohibition sign: Do not touch! Do not block!
Do not touch or block identified area.
Hazard warning sign: Strong magnetic field!
• No magnetic memory.
• No jewelry.
• No metallic items.
Emergency exit!
• Always keep the emergency exit clear.
• Follow the arrows if necessary.
ZTKS0156 / Z31820 / Rev.: 03
• Doors must pushed open in escape direction.
27
Safety
1. Quench Valves
2. One-way Valve of the helium
vessel
3. Pressure Relief Valve of the
cold head turret
4. Drop-off Plate
2.7 Safety Devices
The cryostat of the supplied magnet system is equipped with the following safety
devices:
Figure 2.1: Safety Devices of the RS Cryostat
28
ZTKS0156 / Z31820 / Rev.: 03
Safety
Quench Valve
The quench valves (1) are the safety devices of the helium vessel. They open with a
defined pressure. In case of an accidental overpressure in the helium vessel the quench
valves will release the pressure smoothly.
One-way Valves
The one-way valves at the helium flow system (2) keeps air and moisture from entering
the helium vessel in case of an accidental underpressure inside the vessel.
Pressure Relief Valve
The pressure relief valve (3) is the safety device of the cold head turret. It opens with a
defined pressure. In case of an accidental overpressure in the cold head turret the
pressure relief valve will release the pressure smoothly.
Drop-off Plate
The drop-off plate (4) is a safety device of the RT vessel. If the vacuum breaks, the dropoff plate will open. In case of an accidental overpressure in the RT vessel the drop-off
plate will release the pressure smoothly.
Cryogenic Refrigerator Parts
For information about the safety devices of the Cryogenic Refrigerator parts refer to the
supplied separate manual.
ZTKS0156 / Z31820 / Rev.: 03
29
Safety
2.8 Behavior in Danger and Emergency Situations
Preparations
• Keep the emergency exits free at all times.
• Prepare and maintain an up-to-date list of emergency telephone numbers in the
magnet system area.
In Case of Emergency
• Leave the danger zone immediately.
• Check for sufficient ventilation in the room before entering, especially if people are
showing symptoms of suffocation.
• Rescue persons from the danger zone.
• Provide medical attention for people with symptoms of suffocation.
• Start first aid immediately.
• Call the responsible contact.
• Call for medical assistance.
• Call the fire department.
First Aid for Cold Burns
• Help the injured persons to lie down comfortably in a warm room.
• Loosen all clothing which could prevent blood circulation in the injured area.
• Pour large quantities of warm water over the affected parts.
• Cover the wound with dry and sterile gauze.
• In case of contact of liquid cryogenic agents with the eyes rinse thoroughly with
clean water.
• Call for medical assistance.
2.9 Fire Department Notification
• Inform the fire department about the potential risks of a magnet system, i.e. danger
of ferromagnetic rescue equipment close to the magnet system.
30
• Laboratory windows which are accessible during an emergency should be clearly
identified with warning signs, visible from the outside.
• Inform the fire department about the characteristics of a quench to prevent confusion with smoke.
• Never pour water over the magnet system during a quench!
ZTKS0156 / Z31820 / Rev.: 03
3 Transportation
The cryostat is supplied in a wooden box on a
pallet. It is secured inside with straps against
tilting and moving.
Accessories such as the flow systems, level
sensors and bore tubes are in the side compartment of the box.
The Cryogenic Refrigerator parts and the Flex
Lines are supplied in boxes on a pallet.
The Magnet Stand is supplied in a wooden box
on a pallet.
3.1 Safety
The transportation is carried out by Bruker Service or approved persons. However, it
may happen that other persons have to receive the delivery of the shipping boxes. In this
case it is essential to obey the instructions in this chapter and to inform these persons
before.
WARNING
Heavy Weights (see page 2-24)
CAUTION
Transportation (see page 2-25)
3.2 Packaging
Figure 3.1: Packaging (without surrounding panels)
ZTKS0156 / Z31820 / Rev.: 03
31
Transportation
3.2.1 Disposal
Keep the original boxes for future transportation.
If no further transportation is planned, dispose of the boxes according to environmentally friendly regulations.
3.3 Transport Inspection
Investigate the delivery with regard to visible damage and completeness of delivery.
Transport control systems
The shipping and handling monitors (“Shock Watch“, “Tilt Watch“) on the boxes shows, if
the boxes were kicked or tilted during transportation.
Checks
Shock Watch: Follow instructions on the label.
Tilt Watch: Follow instructions on the label.
In case of damage
• Accept delivery with reservation.
• Make a documentation of all observable damage and add it to the transport
documents.
• Start complaint process.
• Contact Bruker Service before installation.
The claim for damage expires after the fixed period.
i
Thus:
Report damages to Bruker Service immediately after detection of damage. For contact
information see page 9 of this document.
32
ZTKS0156 / Z31820 / Rev.: 03
3.4 Transportation by Fork Lift / Pallet Jack
1. Check the route of transport for the minimal
height and width.
2. Check sufficient floor capacity on the route
of transport. In case of doubt ask a stress
analyst.
3. Check sufficient carrying capacity while
using an elevator.
4. Position the forks between the bars of the
box as shown in the figure. Make sure the
side towards the operator is the one with the
labels on it.
5. Make sure the forks of the fork lift are longer
than the box and projects out of the back of
the box as shown in the figure below.
6. Now lift the fork and move the box to the
site.
Recommended for transporting the boxes to the installation site.
Approved Persons: Approved forklift / pallet jack operator
Precondition: The fork lift / pallet jack must be approved for the transportation weight
(see chapter Appendix, Technical Data).
Transport
Transportation
Figure 3.2: Transportation by forklift
ZTKS0156 / Z31820 / Rev.: 03
33
Transportation
1. Exclusively use the marked eyelets (1) as
attachment points for the lifting equipment.
2. Use all
eyelets for the lifting equipment.
3. Follow the instructions on the label on the
top of the cryostat. This label gives
important information about correct
attachment and transportation.
4. Check for correct fastening of the lifting
equipment before lifting the cryostat.
5. Make sure that any movement of the crane
is as slowly as possible to avoid any
damage due to acceleration.
6. Check for correct leveling of the cryostat
while hanging on the crane.
3.5 Transportation with a Crane
Recommended for lifting the cryostat out of the box.
Approved Persons: Approved crane operator
Precondition: The crane must be approved for the transportation weight (see chapter
Appendix, Technical Data).
Attachment Points
34
Figure 3.3: Attachment points for lifting equipment
ZTKS0156 / Z31820 / Rev.: 03
3.6 Storing
If it is necessary to store the cryostat and accessories before installation obey the
following instructions:
• Store the boxes in a closed, dry and dust-free room.
• Store the boxes upright.
• Do not tilt the boxes.
• Do not unpack the supplied boxes.
• Prevent mechanical vibrations to the boxes.
• Storage temperature: 5 - 40 °C.
• Storage humidity: less than 50% @ 23 °C.
Transportation
ZTKS0156 / Z31820 / Rev.: 03
35
Transportation
36
ZTKS0156 / Z31820 / Rev.: 03
4 Assembling
4.1 Safety
Approved Persons: Bruker Service only
Magnetic Fields (see page 2-20)
Cryogenic Agents (see page 2-21)
Electricity (see page 2-21)
Gas under Pressure (see page 2-22)
Spontaneous Ignition and Explosion (see page 2-23)
WARNING
Heavy Weights (see page 2-24)
Personal Protective Equipment:
• Protective goggles
• Protective gloves
• Protective clothes
• Safety shoes
• Portable oxygen monitor and alarm
ZTKS0156 / Z31820 / Rev.: 03
37
Assembling
Necessary Tools and Equipment
• Alignment tool 1.8 mm
• Bruker Vacuum Valve (Material No. Z53420)
• Vacuum pumping unit
• Bruker Power Supply
• Bruker ACD (Automatic Cooling Device)
• Precooling tube ("L-tube")
• Helium transfer line
• Torque wrench 5 - 50 Nm
• Clean gloves
• Ethanol
• Polyester tape
• Vacuum grease
• Screw grease MOLYKOTE P1000 (supplied with the magnet stand)
• Tool kit: (supplied with the CRC package)
• Wrenches for Flex Lines
• PTFE spray
Check if there is sufficient free space above the cryostat to mount the bore tubes and the
i
helium level sensor.
If not sufficient, mount the cryostat according following instructions at a place with
sufficient ceiling height, remove the magnet stand after assembling and transport the
cryostat to the site using the transport box.
If this is not possible, mount the magnet stand supports. For work at the bottom of the
cryostat attach the magnet stand pillars. For inserting the bore tubes or the helium level
sensor remove the magnet stand and lower the cryostat.
Contact Bruker Service head quarter for further information.
38
ZTKS0156 / Z31820 / Rev.: 03
Mount the
Magnet Stand
Prepare the
Cryostat
Assemble
Bore Tubes
Check
Drop off plate
Mount the
Cryogenic
Refrigerator
Parts
Rotary Valve Column
Monitoring
Generate
Vacuum
Cooldown the
Cryostat
Assemble vacuum valve
Remove vacuum valve
Precool (80K)Cooldown (4.2K)
Switch on
Cryogenic Refrigerator
Energize Magnet
Cycle/Shim
Magnet
Remove current
lead
Insert Current
Lead
Remove the
transportation locks
Insert the getter
container
Sub-Procedure different
from St andard NMR
Standar d NMR
Procedur e
Standard NMR
Sub-Proc edure
KEY:
Procedure different from
Standar d NMR
Start Monitoring
Pump an Flush
Evacuate
Cold head
He-Turrets and
Flow System
Feedthrough Plate
Compressor
Assembling
4.2 Assembling Workflow
Figure 4.1: Assembling Workflow
ZTKS0156 / Z31820 / Rev.: 03
39
Assembling
1. Remove the top and side panels of the box.
2. Loosen the fixing straps from the cryostat.
3. Lift the cryostat out of its box.
4. Attach the magnet stand to the cryostat.
Follow the instructions in the manual of the
supplied magnet stand respecting the
warnings given there.
WARNING: Heavy Weights
Overview positions of the transportation lock
(colored blue).
4.3 Assembling Work
4.3.1 Preparing the Cryostat
Figure 4.2: Preparing the cryostat
4.3.1.1 Removing the Transportation Locks
Figure 4.3: Overview Transportation Locks
40
ZTKS0156 / Z31820 / Rev.: 03
Removing the upper Transportation Lock
1. Remove the water protection cover (1).
2. Remove the two M 12 nuts (2) and washers.
3. Release the three M 8 nuts (1).
4. Remove the threaded M 8 bolt (3).
5. Release the six M 5 x 14 screws (4).
6. Remove the transport top plate (5).
7. Remove the short top fixture flange (1).
8. Remove the intermediate flange (2).
9. Remove the top fixture flange (3).
Figure 4.4: Removing the Transportation Lock - step 1
Assembling
Figure 4.5: Removing the Transportation Lock - step 2
Figure 4.6: Removing the Transportation Lock - step 3
ZTKS0156 / Z31820 / Rev.: 03
41
Assembling
10. The threaded bar (1) remains until removing
the lower transportation lock. Afterwards
remove the threaded bar from the top.
11. Remove three nuts M 8 (2).
12. Remove the threaded bolts M 8 (1).
13. Loosen the twelve screws M 5 x 12 at the
lower transportation lock plate (3). Secure
the lower transportation lock plate against
falling.
14. Remove lower transportation lock plate (3),
the brass nut (4) and lower fixture flange (5).
15. Loosen the threaded bar from the brass nut
(4).
Continue on top of the cryostat:
16. Remove the threaded bar from the top.
WARNING: Heavy Weights
Figure 4.7: Removing the Transportation Lock - step 4
Removing the lower Transportation Lock
Figure 4.8: Removing the Transportation Lock - step 5
Each transportation lock is adapted to only one cryostat, indicated by the magnet system
i
number in each part of the transportation lock.
Do not mix-up transportation locks from other cryostat. Keep all transportation lock parts
for future transportation.
For storage use the compartment of the shipping box of the cryostat.
42
ZTKS0156 / Z31820 / Rev.: 03
4.3.1.2 Mounting the Getter Container
1. Check the clamp (2); retighten it if necessary.
2. Unpack the getter containers from their tin.
3. Insert the getter container (1) into the
clamps (2) respecting the orientation as
shown (flat side of the getter container
atop).
4. Check the distance to the radiation shield.
5. Start generating vacuum no later than
4 hours after inserting the getter container.
If the cryostat is equipped with a getter box
(1) like shown check if the getter box is:
1. mounted correctly and
2. not damaged.
i
Getter is a material, which absorbs helium gas to assure the quality of the vacuum for a
i
long time. After unpacking the getter starts to absorb moisture, reducing the capacity for
absorbing helium inside the cryostat.
Thus: Unpack getter container shortly before insertion. Close and evacuate the cryostat
no later than 4 hours after the insertion of the getter container. Wear clean gloves for
inserting to prevent contamination.
Assembling
Figure 4.9: Mounting the Getter Container
Figure 4.10: Checking the Getter Container
ZTKS0156 / Z31820 / Rev.: 03
43
Assembling
1. Check through the top opening of the
cryostat that all connectors at the inner side
of the feedthrough plate are plugged and the
cables are not stressed or bent.
2. Check the feedthrough plate is correct
assembled.
1. Mount the lower RS reduction flange (1) to
the radiation shield clips.
2. Mount the upper RS reduction flange (1) to
the radiation shield clips.
4.3.1.3 Checking the Feedthrough Plate
Figure 4.11: Checking and fitting the Feedthrough Plate
4.3.1.4 Assembling the Nitrogen Tube
Bottom of Cryostat
Figure 4.12: Assembling the Nitrogen Tube - step 1
Top of the Cryostat
44
Figure 4.13: Assembling the Nitrogen Tube - step 2
ZTKS0156 / Z31820 / Rev.: 03
Bottom of the Cryostat
3. Insert and fix the lower nitrogen contact
flange (2). Be careful with the super insulation.
4. Clean the nitrogen tube with ethanol. Prevent any contamination (finger prints, dirt
e.g.) to the nitrogen tube surface by using
clean gloves. Prevent any damage (scratches, buckling) to the nitrogen tube by handling it carefully.
5. Insert the nitrogen (1) tube from the top.
6. Check the distance between the nitrogen
and helium vessel by inserting the alignment
tool (1) into the three check holes of the
nitrogen contact flange (2). The insertion/
extraction of the alignment tool (1) should be
smooth.
7. If the alignment tool does not insert/extract
smoothly, remove the nitrogen tube and
lower nitrogen contact flange and adjust the
alignment with the alignment rods (1)
(loosen/tighten).
8. Remount the nitrogen tube and nitrogen
contact flange and check the alignment.
9. If the alignment is correct, fix the nitrogen
contact flange.
Figure 4.14: Assembling the Nitrogen Tube - step 3
Assembling
Figure 4.15: Assembling the Nitrogen Tube - step 4
Figure 4.16: Assembling the Nitrogen Tube - step 5
ZTKS0156 / Z31820 / Rev.: 03
45
Assembling
10. Mount the upper nitrogen reduction flange
(1).
11. Adjust the distance between the nitrogen
and helium vessel by inserting the alignment
tool into the three check holes of the nitrogen contact flange (2).
12. Fix the upper nitrogen contact flange (1).
13. Check the alignment tool (2) for free
movement. Remove the alignment tool.
14. Close the cuts of the super insulation with
polyester tape without taping the insulation
to other surfaces.
1. Check the O-ring slot (1) of the lower RT
reduction flange.
2. Remove scratches, if necessary.
3. Clean the O-ring slot with ethanol.
4. Clean the O-ring with ethanol.
5. Grease the O-ring with vacuum grease and
place it into the O-ring slot. Prevent
contamination with dust and dirt.
6. Grease the twelve M 5 x 12 screws (1) with
screw grease.
7. Insert the lower RT reduction flange from
the bottom. Check the index. The lower RT
reduction flange can be inserted in only one
position.
8. Fix the lower RT reduction flange with the
twelve screws (torque 12 Nm).
Top of the Cryostat
Figure 4.17: Assembling the Nitrogen Tube - step 6
4.3.1.5 Assembling the RT Tube
Bottom of the Cryostat
Figure 4.18: Assembling the RT Tube - step 1
46
Figure 4.19: Assembling the RT Tube - step 2
ZTKS0156 / Z31820 / Rev.: 03
Figure 4.20: Assembling the RT Tube - step 3
9. Check the alignment of the nitrogen tube
and the lower RT reduction flange with a
view through the nitrogen tube from the top.
If the alignment is not correct, remove the
lower RT reduction flange and adjust the
alignment with the three lower alignment
rods (loosen/tighten).
10. Insert the lower RT closure flange (1) to the
RT reduction flange (2). Check the index.
The lower RT closure flange can be inserted
in only one position.
11. Fix it with only three of the six M5 x 12
screws.
12. Clean the RT tube carefully with ethanol.
Prevent any contamination (finger prints, dirt
e.g.) to the RT tube surface by using clean
gloves. Prevent any damage (scratches,
buckling) to the RT tube by handling it
carefully.
13. Insert the RT tube from the top.
In case the RT tube is insulated handle it
carefully and prevent damage to the insulation.
In case the RT tube is not symmetrical
respect the correct position. Align the marks
at the inner side of the RT tube with the
mark at upper RT reduction flange.
14. Clean the O-ring of the lower RT closure
flange with ethanol.
15. Grease the O-ring with vacuum grease.
16. Carefully remove the lower RT closure
flange. Secure the RT bore tube against
falling down.
17. Check the O-ring slot at the lower RT
closure flange and clean it with ethanol.
Remove scratches, if necessary.
Assembling
Figure 4.21: Assembling the RT Tube - step 4
Bottom of the Cryostat
Figure 4.22: Assembling the RT Tube - step 5
ZTKS0156 / Z31820 / Rev.: 03
47
Assembling
18. Mount the O-ring (1) to the RT tube.
19. Grease six M 5 x 12 screws with screw
grease.
20. Mount the lower RT closure flange to the
end of the RT tube. Push the RT closure
flange with the RT tube inside the cryostat.
Check the index. The lower RT closure
flange can be inserted in only one position.
21. Fix the bottom RT closure flange with the six
screws (torque 12 Nm).
22. Mount the upper RT reduction flange. Respect the correct position if an eccentrically
upper RT reduction flange was used. Align
the marks at the RT vessel and the upper
RT reduction flange.
23. Grease twelve M 5 x 12 screws with screw
grease.
24. Fix the upper RT reduction flange with the
twelve screws (torque 12 Nm).
25. Grease six M 5 x 12 screws with screw
grease.
26. Fix the upper RT closure flange with the six
screws (torque 12 Nm).
Respect the correct position if an eccentrically upper RT closure flange was used.
Align the marks at the RT closure flange
with the marks at the RT vessel and the
upper RT reduction flange.
Figure 4.23: Assembling the RT Tube - step 6
Figure 4.24: Assembling the RT Tube - step 7
Top of the Cryostat
Figure 4.25: Assembling the RT Tube - step 8
48
ZTKS0156 / Z31820 / Rev.: 03
4.3.1.6 Checking and Fitting the Drop-off Plate
1. Open the drop-off plate.
2. Clean the flange of the RT vessel and the
O-ring with ethanol.
3. Grease the O-ring with vacuum grease.
4. Close the drop-off plate.
5. Check the drop-off plate is correct
assembled.
Figure 4.26: Checking and fitting the Drop-off Plate
Assembling
ZTKS0156 / Z31820 / Rev.: 03
49
Assembling
1. Remove the protection cap of the vacuum
flange at the bottom plate (2) of the cryostat.
2. Install the valve stem (10) onto the sealing
plug (3) and tighten it slightly. Do not fix the
valve body (1) to the cryostat yet.
3. Pull out the sealing plug (3) off the bottom
plate at the valve stem (10).
4. Clean the sealing plug.
5. Check the sealing plug and the O-rings for
damage.
Replace damaged O-rings.
• (4) O-ring 36.14 x 2.5 (Material No.
40692)
• (5) O-ring 44 x 2.5 (Material No. 40693)
• (6) O-ring 57 x 2.5 (Material No. 40695)
6. Grease the O-rings with vacuum grease.
7. Pull out the valve stem (10) of the valve
body (1) until it snaps into place. The snapping is well defined and will be heard and
felt.
8. Check if the sealing plug (3) inside the valve
body is fully inserted.
9. Insert the Vacuum Valve into its seat inside
the bottom plate (2).
10. Turn the Vacuum Valve in the desired position (KF 40 flange (9) looking outwards).
11. Insert the two half rings (7) as shown into
the slots of the valve body (1).
12. Fix the half rings (7) with four M 6 x 12 (8)
screws.
4.3.2 Evacuating the Cryostat
For evacuating the cryostat use the Bruker Vacuum Valve, Material No. Z53420.
Be careful handling the Vacuum Valve. Tilting of the Vacuum Valve during insertion may
i
damage the O-ring or required edges and surfaces of the Vacuum Valve. Thus pay
attention to the axis during insertion of the Vacuum Valve.
4.3.2.1 Mounting the Vacuum Valve
50
Figure 4.27: Mounting the Vacuum Valve
ZTKS0156 / Z31820 / Rev.: 03
4.3.2.2 Mounting the Vacuum Valve at Evacuated Cryostat
1. Remove the protection cap of the vacuum
flange at the bottom plate (2) of the cryostat.
2. Install the valve stem (10) onto the sealing
plug (3) and tighten it slightly.
3. Turn the Vacuum Valve in the desired position (KF 40 flange (9) looking outwards).
4. Place the two half rings (7) as shown into
the slots of the valve body (1).
5. Fix the half rings (7) with four M 6 x 12 (8)
screws.
The sealing plug can not be moved until a correct vacuum was applied at the KF 40
i
flange at the Vacuum Valve.
Assembling
Figure 4.28: Mounting the Vacuum Valve at evacuated cryostat
ZTKS0156 / Z31820 / Rev.: 03
51
Assembling
1. Connect the vacuum pumping unit with the
KF connector to the KF 40 flange (6) of the
Vacuum Valve (2). Use a short pump line
with large diameter.
2. Pull out the valve stem (7) of the valve body
(2) to release the sealing plug (1) out of the
bottom plate (3).
The sealing plug (1) snaps into place. The
snapping is well defined and will be heard
and felt. The cryostat is open after this procedure.
3. Pump and flush five times with dry nitrogen
gas (only necessary for generating vacuum
for the first time).
4. Generate a vacuum of 10
-4
bar with the
roughing pump.
5. Generate a vacuum of less than
5x10
-8
bar with a turbo pump (up to
48 hours).
6. The pumping unit has to be operating until
liquid helium filled inside the helium vessel,
respectively until the magnet inside is at a
temperature of 77 K.
7. At the end of the helium filling procedure
push the valve stem (7) slightly and fully into
the valve body (2) to insert the sealing plug
(1) in the vacuum flange at the bottom plate
(3).
The sealing plug (1) snaps in. The snapping
is well defined and will be heard and felt.
8. Stop pumping.
4.3.2.3 Generating the Vacuum
Figure 4.29: Generating the Vacuum
52
ZTKS0156 / Z31820 / Rev.: 03
4.3.2.4 Rebuilding the Vacuum
1. Connect the vacuum pumping unit to the
KF 40 flange (6) of the Vacuum Valve (2).
Use a short pump line with large diameter.
2. Generate a vacuum of 10
-4
bar with the
roughing pump.
3. Generate a vacuum of less than
5 x 10
-8
bar with a turbo pump.
4. Pull out the valve stem (7) of the valve body
(2) to release the sealing plug (1) out of the
bottom plate (3).
The sealing plug (1) snaps into place. The
snapping is well defined and will be heard
and felt. The cryostat is open after this procedure.
5. Continue generating a vacuum of less than
5 x 10
-8
bar (up to 48 hours).
6. Push the valve stem (7) slightly and fully into
the valve body (2) to insert the sealing plug
(1) into the bottom plate (3).
The sealing plug (1) snaps in. The snapping
is well defined and will be heard and felt.
7. Stop pumping.
1. Ventilate the pump line at the pumping unit.
2. Remove the pump line at the KF 40 flange
(9).
3. Release the valve stem (10) from the
sealing plug (3) and pull out the valve stem
(10) until it snaps in.
The snapping is well defined and will be
heard and felt.
4. Remove the four M 6 x 12 screws (8) from
the half rings (7).
5. Remove the half rings (7) and the vacuum
valve (1).
6. Mount the protective caps on the vacuum
flange at the bottom plate (2) of the cryostat.
Assembling
Figure 4.30: Rebuilding the Vacuum
4.3.2.5 Removing the Vacuum Valve
Figure 4.31: Removing the Vacuum Valve
ZTKS0156 / Z31820 / Rev.: 03
53
Assembling
Remove the top and the front panel of the box of
the Cryogenic Refrigerator box like shown.
1. Remove the service flange from the cold
head turret.
Keep the service flange for further service or
transportation inside the box of the cold head.
2. Check if the cold head turret inside is dry
and clean. Clean it if necessary.
3. Clean the mating surface from cold head
turret top flange.
4. The cold head turret flange is marked with
an “X“ (1) for the following steps.
4.3.3 Mounting the Cryogenic Refrigerator Parts
Figure 4.32: Cryogenic Refrigerator Parts - General View
4.3.3.1 Mounting the Cold Head
Figure 4.33: Mounting the Cold Head - step 1
54
Figure 4.34: Mounting the Cold Head - step 2
ZTKS0156 / Z31820 / Rev.: 03
Assembling
5. Carefully remove the cold head from its box
and place it upside down on a clean and
stable work surface. Keep the box for future
transportation.
6. Check if the copper flange (1) is assembled
correctly and clean the surface.
7. Check if the insulation (2) is assembled correctly.
8. Clean and grease the two O-rings (3) before
mounting them on the cold head flange.
9. Assemble the three M 5 adjustment screws
(4) to the cold head flange. The thread
should not be visible at the O-ring side of the
flange.
10. Turn the cold head carefully and set it on the
copper flange.
11. Mount the cold head in the cold head turret
respecting the orientation. Match the marks
“X” on the cold head flange top side and on
the cold head turret top flange.
12. Insert the cold head until rigid contact to the
bottom of the cold head turret.
The assembly is correct, if there is a gap of
about 2 mm between cold head flange and
turret flange.
The cold head tubes are sensitive against forces in any direction. Do not remove the
i
cold head insulation. Handle the cold head carefully.
Figure 4.35: Mounting the Cold Head - step 3
Figure 4.36: Mounting the Cold Head - step 4
ZTKS0156 / Z31820 / Rev.: 03
55
Assembling
13. Set the M 5 adjustment screws (1) to the
turret flange and tighten them by one turn.
The cold head is lifted 0.8 mm.
14. Fix the adjustment screws (1) with the three
nuts on top of the cold head flange.
15. Attach the three M 6 fixing screws (3). Do
not tighten these screws yet.
16. Slightly grease the O-ring and sealing surface of the KF 16 flange before assembling
the pressure relief valve (2).
17. Assemble the pressure relief valve (2) to the
KF 16 flange.
18. Slightly grease the O-ring and sealing surface of the KF 16 flange before mounting
the stop valve (2).
19. Assemble the stop valve (2) to the KF 16
flange and open it.
1 Noise protection cover
2 Stand plates (each 3x)
3 Base supports (3x)
4 Noise protection cap
5 Base plate
6 Profile rail
7 Adapter plate
8 Front plates
9 Sliding blocks
10 Accessories
11 Profile cap
12 Velcro® fastener
13 Flex line positioning disc
14 Stand plates (2x)
Figure 4.37: Mounting the Cold Head - step 5
4.3.3.2 Mounting the Rotary Valve Column
Figure 4.38: Rotary Valve Column - overview
56
ZTKS0156 / Z31820 / Rev.: 03
Figure 4.39: Mounting the Rotary Valve Column - step 1
1. Put the base plate (1) upside down.
2. Arrange the three base supports (2) as
shown in the figure with the tapered bores
(3) on topside.
3. Mount the three base supports to the base
plate with three M 8 x 25 screws (1) per support.
4. Tighten the screws (torque 20 Nm).
5. Attach the spikes (1) into the middle thread
of the three base supports.
Assembling
Figure 4.40: Mounting the Rotary Valve Column - step 2
Figure 4.41: Mounting the Rotary Valve Column - step 3
The spikes of the base plate should be protected with the supplied plastic cap nuts until
i
the rotary valve column is in its final position to prevent damage to the floor surface.
These plastic cap nuts have to be removed before operating the magnet system.
ZTKS0156 / Z31820 / Rev.: 03
57
Assembling
6. Adjust the spikes to a height of 30 mm.
7. Fix the spikes with counter nuts.
8. Mount the stand plate (1) from the bottom
side with three M 12 x 35 screws with
washers (3) from the bottom side. Do not
tighten these screws yet.
9. Continue with the same procedure for the
second stand plate. Do not tighten these
screws yet.
Figure 4.42: Mounting the Rotary Valve Column - step 4
Figure 4.43: Mounting the Rotary Valve Column - step 5
Figure 4.44: Mounting the Rotary Valve Column - step 6
58
ZTKS0156 / Z31820 / Rev.: 03
Figure 4.45: Mounting the Rotary Valve Column - step 7
10. Consider the bottom side of the profile with
the two thread inserts (1).
11. Put two sliding blocks in each side track of
the profile rail.
12. Put the assembled profile rail in-between the
stand plates.
13. Attach the profile rail using four M 8 x 35
screws with washers (1) to the two stand
plates. Do not tighten these screws yet.
14. Fix the profile rail to the base plate with the
two M 8 x 35 screws with washers (2).
Tighten the screws (torque 20 Nm).
15. Tighten the four M 8 x 35 screws (1) of the
stand plates (torque 20 Nm).
16. Tighten the six M 12x35 screws of the stand
plates (torque 50 Nm).
17. Put one sliding blocks (1) into the track at
one side of the profile rail.
18. Attach two M 8 x 35 screws in the sliding
block.
19. Adjust the sliding block on approximately
half of the profile rail.
20. Tighten the two M 8 x 35 screws.
Assembling
Figure 4.46: Mounting the Rotary Valve Column - step 8
Figure 4.47: Mounting the Rotary Valve Column - step 9
ZTKS0156 / Z31820 / Rev.: 03
59
Assembling
21. Mount the flex line positioning disc (1) between the two screws on the sliding block as
shown in the figure.
22. Put two sliding blocks (1) into the tracks on
both sides of the profile rail.
23. Plug in the plastic cap (2) on the top side of
the profile.
24. Assemble the front plate (1) to the two adapter plates (2) using six M 8 x 35 screws with
washers (3) (torque 20 Nm).
25. Mount the preassembled adapter (1) using
four M 8 x 35 screws with washers (2) to the
two sliding blocks.
26. Adjust it as shown in the figure.
400 R: X = 166 mm
500 R: X = 206 mm
27. Fix the four screws (torque 20 Nm).
Figure 4.48: Mounting the Rotary Valve Column - step 10
Figure 4.49: Mounting the Rotary Valve Column - step 11
Figure 4.50: Mounting the Rotary Valve Column - step 12
60
Figure 4.51: Mounting the Rotary Valve Column - step 13
ZTKS0156 / Z31820 / Rev.: 03
4.3.3.3 Mounting the Rotary Valve and Flex Lines
1. Put down the Rotary Valve Column on the
clean floor.
2. Mount the rotary valve (1) with four M 6 x 35
screws to the front plate (2) (torque 20 Nm).
3. Remove the flex lines from their box.
4. Thread the high (2) and low (3) pressure flex
lines through the base plate and the flex line
positioning disc (1) as shown.
5. Thread the motor cord (4) through the base
plate and the flex line positioning disc (1) as
shown.
6. Clean the male parts of the hose couplings
(1) from the high and low pressure sockets
of the rotary valve with ethanol.
7. Clean the sealing surface (2) with ethanol.
8. Check and clean the O-ring (3) with ethanol.
9. Check the correct position of the O-ring (3)
before closing the coupling.
The Aeroquip® couplings of the connection line, rotary valve and cold head and the flex
i
lines are protected against damage and dust with plugs. Keep them for future
transportation in the rotary valve box.
Assembling
Figure 4.52: Mounting the Rotary Valve and Flex Lines - step 1
Figure 4.53: Mounting the Rotary Valve and Flex Lines - step 2
Figure 4.54: Mounting the Rotary Valve and Flex Lines - step 3
ZTKS0156 / Z31820 / Rev.: 03
61
Assembling
10. Clean the thread (1) of the female part of the
hose coupling of the flex lines with ethanol.
11. Clean the sealing surface (2) of the female
part of the hose coupling with ethanol.
12. Grease the outside thread of the male part
with PTFE-spray.
Figure 4.55: Mounting the Rotary Valve and Flex Lines - step 4
The thread surfaces of the house couplings have to be greased to reduce friction. But
i
grease on the sealing surfaces of the house couplings may enter the helium cycle and
thus degrade the performance of the Cryogenic Refrigerator.
Thus the sealing surfaces have to be protected during greasing. The easiest way to
obey this advice is to connect (one turn) the male and female part as shown in the next
figure or to use the supplied plugs of the Aeroquip® couplings. Alternatively a tissue may
be used.
62
Figure 4.56: Mounting the Rotary Valve and Flex Lines - step 5
ZTKS0156 / Z31820 / Rev.: 03
Figure 4.57: Mounting the Rotary Valve and Flex Lines - step 6
13. Grease the outside thread of the female part
behind the cap nut with PTFE-spray.
14. Connect the low pressure flex line to the low
pressure socket of the rotary valve (short
socket towards front plate).
15. Connect the high pressure flex line to the
high pressure socket of the rotary valve
(long socket behind front socket).
16. Tighten the cup nuts as shown and loosen
them with 1/4 rotation.
17. Connect the motor cord to the socket of the
rotary valve respecting the indexing.
18. Put up the rotary valve column carefully.
Arrange the flex lines inside the hole of the
base plate carefully. Prevent sharp bends to
the flex lines and the motor cord. Prevent
damage to the flex line or motor cord insulation.
19. Close the flex line positioning disc with the
supplied Velcro® fastener.
Assembling
Figure 4.58: Mounting the Rotary Valve and Flex Lines - step 7
Figure 4.59: Mounting the Rotary Valve and Flex Lines - step 8
The sound-insulating material of the noise protection is pressure-sensitive. Damaging
i
the sound insulating material will reduce its performance.
Thus:
Prevent pressure on the sound insulating material. Prevent contact between the rotary
valve column assembly during insertion into the noise protection cover.
ZTKS0156 / Z31820 / Rev.: 03
63
Assembling
20. Consider the weld of the noise protection
cover as shown in the figure.
21. Put the noise protection cover (1) over the
rotary valve. The weld in the noise protection cover (2) should be on the front side of
the rotary valve column (3) facing towards
the cryostat.
22. Fix the noise protection cover with three
special nuts M 6 from the bottom side to the
base plate (3).
Figure 4.60: Mounting the Rotary Valve and Flex Lines - step 9
64
Figure 4.61: Mounting the Rotary Valve and Flex Lines - step 10
ZTKS0156 / Z31820 / Rev.: 03
Figure 4.62: Mounting the Rotary Valve and Flex Lines - step 11
23. Put the noise protection cap on the top of
the rotary valve column.
24. Attach the insulation tube (1) to the connection line of the rotary valve.
Respect the orientation: put the female part
towards the rotary valve.
25. If necessary cut away 40 mm on the male
side of the insulation to allow free access to
the Aeroquip® coupling.
26. Align the rotary valve column (1)
relatively to the magnet stand and
the cryostat (4) as shown.
The connection line (2) between
rotary valve column (1) and cold
head (3) should not be stressed.
27. Remove the plastic cup nuts from
the spikes of the rotary valve
column.
28. Check the rotary valve column is
levelled horizontally. If necessary
adjust the levelling using the three
spikes of the rotary valve column.
Assembling
Figure 4.63: Mounting the Rotary Valve and Flex Lines - step 12
Figure 4.64: Mounting the Flex Lines and the Connection Line: Alignment
ZTKS0156 / Z31820 / Rev.: 03
65
Assembling
29. Connect the connection line (3) to the cold
head (2) following the instructions given in
Figures 4.56-4.58 above.
Prevent any torque to the connection line
during tightening.
30. Loose the cup nut of the connection line with
1/4 rotation.
31. Assemble the two lower parts of the noise
protection cover (1) on the cold head turret.
32. Check the groove inside the lower part of
the noise protection cover is below the
connection line (2).
33. Attach the two M 4 screws (3) to assemble
the two lower parts of the noise protection
cover.
34. Fix the lower parts of the noise protection
cover with the four M 5 screws (1) to the
cold head turret.
35. Attach the noise protection cover (1) over
the cold head respecting the position.
Figure 4.65: Mounting the Noise Protection Cover - step 1
66
Figure 4.66: Mounting the Noise Protection Cover - step 2
Figure 4.67: Mounting the Noise Protection Cover - step 3
ZTKS0156 / Z31820 / Rev.: 03
4.3.3.4 Mounting the Compressor
1. Loosen the fixing straps from the compressor.
2. Remove the ring screws (1).
3. Use the supplied ramp (2) to roll out the
compressor.
WARNING: Heavy Weights
For further information refer to the supplied manual of the Cryogenic Refrigerator.
The compressor is very sensitive against deviation from the power supply of more than
i
5 %. The compressor is also very sensitive against deviation from the pressure inside
the helium circuit of more than 2 %. This can cause failure and damage.
Thus:
An applicable circuit breaker or fused disconnect switch must be provided on site to
prevent deviant voltage situation.
Check the compressor pressure while switched OFF.
The gauges should read:
- 50 Hz compressor: 14.5 +/- 0.34 bar (210 +/- 5 PSI)
- 60 Hz compressor: 14.5 +/- 0.34 bar (210 +/- 5 PSI)
If the pressure is too high, vent helium to the set value. If the pressure is too low, add
helium of high purity (He 5.0, 99.999%) to the set value. Contamination with other gases
in the helium cycle will severely degrade the cold head‘s function and it will require
factory servicing.
Assembling
Figure 4.68: Mounting the Compressor - step 1
ZTKS0156 / Z31820 / Rev.: 03
67
Assembling
4. Check the compressor pressure at the
gauges on the front panel (1).
5. Prepare the compressor location.
Ambient temperature must be in the range 7
to 38 °C (45 to 100 °F), compressor must be
in a levelled position (within 5°).
6. Connect the low pressure flex line (2) to the
compressor. Tighten cap nuts and loosen
them with 1/4 rotation.
7. Connect the high pressure flex line (3) to the
compressor. Tighten cap nuts and loosen
them with 1/4 rotation.
8. Only compressor with water cooling option:
connect the water lines (5) to the compressor respecting the flow direction.
9. Connect the motor cord (6) to the compressor.
10. Connect the compressor to the main power
with the attached power cable (4).
11. If supplied mount the noise protection cover.
12. Cut the supplied Velcro® fastener in pieces
of 400 mm to arrange and fix the flex lines
and the motor cord.
Figure 4.69: Mounting the Compressor - step 2
Do not interchange the flex lines and their corresponding socket. Otherwise the
i
Cryogenic Refrigerator will not start.
68
ZTKS0156 / Z31820 / Rev.: 03
4.3.3.5 Mounting the Helium Level Sensor
1. Clean the O-ring (1) of the helium fill-in turret
with ethanol.
2. Grease the O-ring (1) with vacuum grease.
3. Clean the sealing surface for the O-ring.
4. Mount the O-ring (1) into the sealing surface.
5. Insert the helium level sensor (1). Make sure
the helium level sensor inserted into the correct hole of the siphon.
6. Connect the connector (2) of the helium
level sensor (1) with the connector (3) of the
helium flow system (4).
7. Insert the helium level sensor (1) into the
gap of the baffle (5) and insert the assembly
into the helium fill-in turret.
8. Fix the black nut (1).
9. Calibrate the helium level sensor in the
TopSpin Service Web. Refer to the supplied
manual of TopSpin.
Figure 4.70: Mounting the Helium Level Sensor - step 1
Assembling
Figure 4.71: Mounting the Helium Level Sensor - step 2
Figure 4.72: Mounting the Helium Level Sensor - step 3
ZTKS0156 / Z31820 / Rev.: 03
69
Assembling
1. Clean the O-ring of the current lead turret (1)
with ethanol.
2. Grease the O-ring (1) with vacuum grease.
3. Clean the sealing surface for the O-ring.
4. Mount the O-ring (1) into the sealing surface.
5. Mount the helium flow system (1) as shown
with the one-way valve (2) showing
backwards and the flexible side at the
helium fill-in turret (7).
6. Check the correct position of the globes in
the quench valves (6, 9) of the helium fill-in
turret (7) and the current lead turret (8).
7. Connect the stop valve (4) with the supplied
tube (3) with the connector at the one-way
valve (2).
4.3.3.6 Mounting the Helium Flow System
Figure 4.73: Mounting the Helium Flow System - step 1
70
Figure 4.74: Mounting the Helium Flow System - step 2
ZTKS0156 / Z31820 / Rev.: 03
4.3.3.7 Mounting the Temperature Control
The temperature of the refrigerated radiation shield inside the cryostat during usual operation must be controlled and in case of failure the operator will receive an alarm.
Set the alarm temperature level to 90 K at MICS and at the External Temperature
Control Unit.
The alarm will be given in four different ways:
• Alarm message at the computer of the magnet system via MICS.
• Alarm message by email generated via MICS.
• Alarm message at the display of the External Temperature Control Unit.
• Audible alarm from the External Temperature Control Unit.
The cryostat has two PT 100 temperature sensors for monitoring. One sensor is connected to the BSMS board of the console with supplied VTA MAG-RS unit and Cable Set
BSVT, controlled with MICS. The other sensor is connected to the External Temperature
Control Unit with the supplied cable.
Assembling
The two PT 100 sensors should be used in a parallel manner to prevent any lack of
i
monitoring due to failure of the sensors or the power supply.
Thus: connect the console to another electrical circuit than the External Temperature
Control Unit.
ZTKS0156 / Z31820 / Rev.: 03
71
Assembling
1. Connect the VTA MAG-RS (figure below)
with the S1 and the S3 / H1 port at the feedthrough plate respecting the number of pins.
2. Connect the VTA MAG-RS to the BSMS
board at the console with the supplied BSVT
cable.
3. Connect the S2 port of the feedthrough plate
to the External Temperature Control Unit
with the supplied cable.
For further steps follow the instructions given in
the supplied manual of the External Temperature
Control Unit.
Figure 4.75: Mounting the Temperature Control - step 1
Figure 4.76: Mounting the Temperature Control - step 2
Installation has been completed correctly, if both readings of MICS and the External
i
Temperature Control Unit show the same temperature values.
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ZTKS0156 / Z31820 / Rev.: 03
4.3.4 Cooling down from 300 K to 80 K
1 Current lead turret
2 Helium fill-in turret
3 ACD (Automatic Cooling
Device)
4 Transportation dewar with
liquid nitrogen
5 Transportation dewar with
warm nitrogen gas
WARNING
Cryogenic Agents (see page 2-21)
Gas under Pressure (see page 2-22)
Preconditions
• Magnet Stand mounted (refer to the manual of the Magnet Stand).
• Helium flow system mounted (see chapter ”Mounting the Helium Flow System”
on page 4-70).
• Cryostat is evacuated with a vacuum less than 5 x 10
Assembling
-8
bar.
• Cryogenic Refrigerator mounted completely.
• Transportation dewar with sufficient dry and warm nitrogen gas.
• Transportation dewar with sufficient warm helium gas.
• ACD (Automatic Cooling Device) mounted on a transportation dewar with sufficient
liquid nitrogen.
Figure 4.77: Assembly for cooling down from 300 K to 80 K with ACD
ZTKS0156 / Z31820 / Rev.: 03
73
Assembling
1 Current lead
2 One way valve
3 Stop valve
4 Cold Head
5 Precooling tube
6 Quench valves
Procedure cooling down the helium vessel:
1. Check the correct setting of the globes inside the quench valves (6).
Figure 4.78: Helium Flow System during cool down
2. Remove the connector and the tube to the stop valve.
3. Check the helium flow system is mounted like shown in the figure above.
4. Check the cold head (4) is in the lifted position (refer to ”Mounting the Cold Head”
on page 4-54).
5. Close the vacuum valve (refer to ”Removing the Vacuum Valve” on page 4-53)
and remove the vacuum pumping unit from the vacuum valve.
6. Connect the stop valve at the cold head flange with the vacuum pumping unit.
7. Apply a vacuum of 0.01 bar inside the cold head turret.
8. Pump and flush the cold head turret two times with warm helium gas.
9. Close the stop valve at the cold head flange.
10. Connect the stop valve at the cold head turret with a transportation dewar with warm
helium gas. Apply a pressure of 0.1 bar (1.5 PSI) at the transportation dewar.
11. Open the stop valve at the cold head flange.
12. Remove the plug on top of the helium fill-in turret.
13. Insert the precooling tube into the helium fill-in turret carefully. Check the precooling
tube is completely inserted. Check the O-ring sealing the precooling tube properly.
14. Connect the precooling tube (5) to a pressure gauge.
15. Connect the vacuum pumping unit at the one way valve (2).
16. Apply a vacuum of 0.01 bar inside the helium vessel.
74
17. Pump and flush the helium vessel one time at room temperature with warm nitrogen
gas to make sure that the helium vessel is dry before cooling down.
18. Connect the vacuum pumping unit to the vacuum valve and continue to generate
vacuum (refer to ”Generating the Vacuum” on page 4-52).
19. Insert the auxiliary shorting plug into the helium fill-in turret (right turret).
20. Remove the shorting plug out of the current lead turret (left turret).
ZTKS0156 / Z31820 / Rev.: 03
Assembling
31. Turn the three M 5 adjustment screws (1) at
the cold head flange (3) counter clockwise
until the thread is not longer visible at the
bottom side of the cold head flange.
32. Tighten the three M 6 screws (2) (torque
less than 1 Nm) to push down the cold head
in operating position. The assembly is correct, if there is a gap of about 2 mm between
cold head flange (3) and turret flange (4).
33. Tighten the three M 5 adjustment screws (1)
(torque less than 1 Nm) against the cold
head flange (3).
34. Fix the three M 5 adjustment screws (1) with
the nut.
21. Insert the current lead into the current lead turret respecting the correct position.
The current lead can only be inserted in one position.
22. Remove the auxiliary shorting plug out of the helium fill-in turret.
23. Connect the ACD with the current lead (1).
24. Connect the current lead to the Bruker power supply.
25. Check resistance of the magnet coils and shims at room temperature (see Appendix
Technical Data).
26. Check the zero readings of the PT 100 temperature sensors (see Appendix
Technical Data).
27. Check zero reading of the helium level sensor.
28. Check the connection between the PT 100 connector at the current lead and the
ACD. The ACD must show approximately room temperature (~293 K).
29. Connect the precooling tube (5) with the liquid nitrogen transportation dewar.
30. Adjust the pressure of the liquid nitrogen transportation dewar to 0.2 - 0.3 bar
(1 - 2 PSI).
=> liquid nitrogen transfer starts.
Precooling with liquid nitrogen reduces the consumption of liquid helium during cooling
i
down.
Time for cooling down to 80 K with liquid nitrogen will take 18 to 24 hours.
i
Figure 4.79: Adjusting the Cold Head
35. Set the Cryogenic Refrigerator into operation. Operating properly, the Cryogenic
Refrigerator will emit a rhythmic squeak or chirp. This noise is an indication of the
proper flow of the gas inside the system.
ZTKS0156 / Z31820 / Rev.: 03
75
Assembling
36. Check at the high and low pressure gauges on the compressor front panel if the
mean values are different and if an oscillation of the needles is noticeable. This
difference will decrease as the cold head cools down.
The typical pressure difference are approximately:
50 Hz compressor: 14.5 to 16.5 bar (210 to 240 PSI) with a 0.34 to 0.7 bar
(5 to 10 PSI) amplitude on the needles.
60 Hz compressor: 14.5 to 16.5 bar (210 to 240 PSI) with a 0.34 to 0.7 bar
(5 to 10 PSI) amplitude on the needles.
For further information refer to the supplied manual of the Cryogenic Refrigerator.
37. Check the two PT 100 temperature sensors for monitoring the cooling down.
38. The ACD will stop the liquid nitrogen transfer automatically at a temperature of 80 K
to prevent the accumulation of liquid nitrogen inside the helium vessel. The
magnet’s temperature monitored with the two PT 100 temperature sensors should
be between 80 K and 90 K.
In case of cooling down without Automatic Cooling Device (ACD):
i
- connect the two PT 100 temperature sensors to a measuring device (not supplied)
- check the PT 100 temperature sensor: temperature difference between upper and
lower temperature sensor maximal 25 K. Adjust the cooling speed with the liquid
nitrogen flow.
- stop liquid nitrogen transfer at a temperature of 80 K at the lower PT 100 temperature
sensor.
39. Switch off the ACD and remove the connection to the liquid nitrogen transportation
dewar at the precooling tube (5).
40. Remove the one way valve (2) from the helium flow system and connect the
nitrogen gas transportation dewar to the helium flow system.
41. Blow in nitrogen gas with a pressure of 0.1 - 0.15 bar (1 PSI) and check if liquid
nitrogen spills out of the precooling tube (5). In case of liquid nitrogen spilling out
warm up the system to 90 K to make sure that no liquid nitrogen is left inside the
helium vessel.
42. Check the temperature of the PT 100 temperature sensors.
43. Remove the nitrogen gas transportation dewar at the helium flow system and
remount the one way valve (2).
44. Connect the precooling tube (5) to a pressure gauge.
Keep the helium flow system closed at all times if the cryostat is below room tem-
i
perature to prevent moisture entering the helium vessel. If necessary open the helium
flow system as short as possible. Do not open both helium turrets simultaneously.
Keep the cold head turret pressurized at all times if the cryostat is below room temperature.
76
ZTKS0156 / Z31820 / Rev.: 03
4.3.5 Cooling down to 4.2 K
1 Connector
2 One way valve
3 Stop valve
4 Cold Head
5 Quench valves
Preconditions
• Helium vessel filled with cold nitrogen gas.
• Current lead inserted into the current lead turret.
• Power supply connected to the current lead.
• Upper and lower PT 100 temperature sensors show 80 - 90 K.
Assembling
• Vacuum pumping unit connected; cryostat evacuated with vacuum less than
• Stop valve (3) at the cold head flange connected with the transportation dewar with
• Transportation dewar with sufficient dry and warm helium gas ready.
• Transportation dewar with sufficient liquid helium ready.
Procedure
1. Close the vacuum valve (refer to ”Removing the Vacuum Valve” on page 4-53)
2. Connect the one way valve (2) at the helium flow system with the vacuum pumping
-8
5x10
warm helium gas.
and remove the vacuum pumping unit from the vacuum valve.
unit.
bar).
Figure 4.80: Helium Flow System during usual operation
3. Pump and flush the helium vessel with warm helium gas 5 times:
4. Connect the vacuum pumping unit to the vacuum valve and continue to generate
5. Check the zero reading of the helium level sensor.
6. Insert the magnet side of the helium transfer line completely into the helium fill-in
ZTKS0156 / Z31820 / Rev.: 03
- Fill the helium vessel with dry helium gas until the quench valves open.
- Pump to the following pressures: 0.8, 0.5, 0.3, 0.1, 0.01 bar (11, 7, 4, 1.5, 0.1 PSI).
- Use short pumping times!
vacuum (refer to ”Generating the Vacuum” on page 4-52).
turret.
77
Assembling
7. Insert the other side of the helium transfer line into the helium transportation dewar
slowly. Fast insertion of the warm transfer line causes evaporation of helium and
may cause overpressure inside the transportation dewar.
8. Adjust a pressure of 0.1 - 0.2 bar (1.5 - 3 PSI) at the helium transportation dewar.
=> Helium transfer starts.
Time for cooling down to 4.2 K with helium will take 4 to 6 hours.
i
9. Use the IBT temperature sensor to monitor the cooling down (see chapter Appendix
Tech n i c a l D a t a ) .
10. Stop helium transfer at a helium level of 100 % at the helium level sensor and 4.2 K
at the IBT temperature sensor.
11. Remove the pumping unit and the vacuum valve (refer to ”Removing the Vacuum
Valve” on page 4-53).
12. Close the stop valve at the cold head turret and remove the helium gas transportation dewar.
13. Mount the supplied connector (1) to the helium flow system and connect the connector with the stop valve at the cold head flange (3).
14. Open the stop valve at the cold head flange (3).
If the magnet system will be energized during the next 24 h, the current lead can remain
i
in the current lead turret. Otherwise continue.
15. Remove the plug out of the turret cap of the helium fill-in turret.
16. Insert the auxiliary shorting plug into the helium fill-in turret.
17. Remove the current lead out of the current lead turret.
18. Insert the shorting plug into the current lead turret with the shorting plug tool respecting the correct position. The shorting plug can only be inserted in one position.
19. Close the current lead turret with the baffle tube, O-ring and screw cap.
20. Remove the auxiliary shorting plug out of the helium fill-in turret.
21. Close the helium fill-in turret immediately with the plug of the turret cap.
22. Record the filling session (see Appendix, Technical Data).
23. Observe the temperature of the outer radiation shield at the External Temperature
Control Unit. The radiation shield will reach its usual operation temperature after
four days operating. Turn on the alarm from the console and the External
Temperature Control Unit if the magnet system is at set operation temperature.
78
ZTKS0156 / Z31820 / Rev.: 03
5Operation
5.1 Safety
Approved Persons:
Bruker Service, Approved Customer Personnel
Magnetic Fields (see page 2-20)
Cryogenic Agents (see page 2-21)
Electricity (see page 2-21)
Gas under Pressure (see page 2-21)
WARNING
Personal Protective Equipment:
• Protective goggles
• Protective gloves
• Safety shoes
• Portable oxygen monitor and alarm
Necessary Tools and Equipment
• Bruker Power Supply
• Auxiliary Shorting Plug
• Current Lead
• Shorting Plug Tool
ZTKS0156 / Z31820 / Rev.: 03
79
Operation
1 Current lead
2 Connector
3 One way valve
4 Stop valve
5 Cold Head
6 Quench valves
5.2 Energizing
Precondition
• Cryostat at 4.2 K for at least 12 hours.
• Helium level at the helium level sensor is above the "minimum level during
energizing" (see Appendix Technical Data of the supplied User Manual).
• Both PT 100 temperature sensors show the same set value.
• Cryogenic Refrigerator operating correctly.
5.2.1 Inserting the Current Lead
1. Prepare the Bruker Power Supply and main power cable.
Figure 5.1: Helium Flow System during energizing
2. Remove the plug out of the turret cap of the helium fill-in turret.
3. Insert the auxiliary shorting plug into the helium fill-in turret.
4. Remove the shorting plug out of the current lead turret.
5. Insert the dry current lead into the current lead turret respecting the correct position.
The current lead can only be inserted in one position.
6. Connect the main power cable and control cables of the Bruker Power Supply with
the current lead.
7. Connect the short circuit cable to the main power cable until energizing.
8. Remove the auxiliary shorting plug out of the helium fill-in turret.
9. Close the helium fill-in turret with the plug of the turret cap.
10. Switch the Bruker Power Supply ON.
80
ZTKS0156 / Z31820 / Rev.: 03
5.2.2 Energizing Procedure
1. Check the helium level is above "minimum level during energizing" (see Appendix
Technical Data of the supplied User Manual) regularly during energizing. Refill the
helium vessel if necessary.
2. Check the settings (current and inductivity) of the Bruker Power Supply:
- Check the main heater current. The current of the main heater must be the same
for the magnet coil and the Bruker Power Supply.
- Check the shim heater current. The current of the shim heater must be the same
for the shim heater and the Bruker Power Supply.
3. Make the main coil heater switch test.
4. Open the main coil heater switch.
5. Start the shim heater automatic.
6. Switch the Z and Z
7. Set the sense voltage to the first value of the energizing assignment (see Appendix
Technical Data of the supplied User Manual).
2
-Shim heater ON.
Operation
8. Set the current to the first value of the energizing assignment (see Appendix
Technical Data of the supplied User Manual).
9. Wait until the sense current at the Bruker Power Supply is 0 V.
10. Continue in the same way with the other values and the overshoot of the energizing
assignment.
11. Check the sense voltage is exactly 0 V for 5 seconds.
12. Close the main coil heater switch.
13. Wait 5 minutes.
=> Main coil heater switch is closed. Main coil is now persistent.
14. Set the current to 0 A at the Bruker Power Supply.
15. Wait until the Bruker Power Supply shows 0 A.
16. Remove the main power cable from the Bruker Power Supply and short-circuit it.
17. The shim automatic must remain switched ON for 12 h after energizing.
Recommended for magnet systems of 500 MHz and more: Continue with cycling, see
chapter ”Cycling Procedure” on page 5-82.
ZTKS0156 / Z31820 / Rev.: 03
81
Operation
Interrupt Energizing
1. Set the current of the Bruker Power Supply to the value of the coil current.
2. Wait until the voltage is 0 V.
3. Close the main heater switch.
4. Wait 5 minutes.
Continue Energizing
1. Set the current of the Bruker Power Supply to the value of the coil current. Wait until
2. Open the main heater switch.
3. Set sense voltage to 30 mV.
4. Shim heater automatic: Z and Z
5. Continue according to the energizing assignment.
=> Main heater switch is closed. Main coil is now persistent.
the current of the Bruker Power Supply is reached.
2
heater ON.
5.2.3 Cycling Procedure
Cycling only recommended for magnet systems of 500 MHz and more.
i
1. Check the time between energizing and cycling was at least 12 hours.
2. Check the helium level is above "minimum level during energizing" (see Appendix
Technical Data of the supplied User Manual). Refill the helium vessel if necessary.
3. Cycle all Z shims with currents according the cycling assignment (see Appendix
Technical Data of the supplied User Manual).
4. Allow the shims 2 minutes to hold these currents.
5. Discharge shims.
6. After energizing/de-energizing the shims at least two times start the shim automatic.
7. Stop shim automatic if procedure has been completed.
8. Wait at least 12 hours before shimming.
Continue with shimming, see chapter ”Shimming Procedure” on page 5-83.
82
ZTKS0156 / Z31820 / Rev.: 03
5.2.4 Shimming Procedure
1. Check the time between cycling was at least 12 hours.
2. Check the settings (current and inductivity) of the Bruker Power Supply. The current
must be the same for the shim coil and the Bruker Power Supply.
3. Switch the shim heater ON.
4. Wait 5 seconds (default setting of the Bruker Power Supply).
5. Set the shim currents according to the shimming assignment (see Appendix
Technical Data of the supplied User Manual).
6. Wait until the current is reached.
7. Leave the shim heater open for 1 minute with the correct shim current before
closing it.
8. Switch the shim heater OFF.
9. Wait 5 seconds (default setting of the Bruker Power Supply).
10. Set the current to 0 A.
Operation
11. Wait until the supply current is 0 A.
12. Continue in the same way with all shims.
ZTKS0156 / Z31820 / Rev.: 03
83
Operation
1 Connector
2 One way valve
3 Stop valve
4 Cold head
5 Quench valves
5.2.5 Removing the Current Lead
1. Check the helium level is above "minimum level during energizing" (see Appendix
Technical Data of the supplied User Manual). Refill the helium vessel if necessary.
2. Insert the auxiliary shorting plug into the helium fill-in turret.
3. Check the current at all Bruker Power Supply cables is 0 A.
4. Switch the Bruker Power Supply OFF.
5. Remove all cables from the current lead.
6. Remove the current lead as quickly as possible.
7. Insert the dry warm shorting plug with the shorting plug tool into the current lead turret respecting the correct position. The shorting plug can only be inserted in one
position.
8. Close the current lead turret with the turret cap. Be careful with the baffles.
9. Remove the auxiliary shorting plug out of the helium fill-in turret.
10. Close the helium fill-in turret immediately with the plug of the turret cap.
5.2.6 Complete Energizing
1. Refill helium to a value of 95 % at the helium level sensor.
2. Check the helium flow system correctly mounted as shown.
3. Tighten the three M 6 screws (torque less than 1 Nm) again to push down the cold
head in operating position. The assembly is correct, if there is a gap of about 2 mm
between cold head flange and turret flange.
4. Tighten the three M 5 adjustment screws (torque less than 1 Nm) and fix them at the
cold head flange with the nuts.
84
Figure 5.2: Helium Flow System during usual operation
ZTKS0156 / Z31820 / Rev.: 03
5.3 Set into Operation
Set the magnet stand into operation by switching
the pneumatic controller to UP position.
For any work at the magnet system like maintenance or refill of helium stop the magnet stand
by switching the pneumatic controller to DOWN
position.
Mount the further equipment of the supplied magnet system respecting their manuals.
Figure 5.3: Start the Magnet Stand
Operation
Figure 5.4: Stop the Magnet Stand
ZTKS0156 / Z31820 / Rev.: 03
85
Operation
86
ZTKS0156 / Z31820 / Rev.: 03
6 Troubleshooting
Troubleshooting must be performed only with approved qualification.
In case of doubts or problems not specified in the following list contact Bruker Service
immediately. For contact information see page 9 of this manual.
6.1 Safety
Approved Persons
Bruker Service, Approved Customer Personnel
WARNING
Magnetic Fields (see page 2-20)
Cryogenic Agents (see page 2-21)
Electricity (see page 2-21)
Gas under Pressure (see page 2-22)
Spontaneous Ignition and Explosion (see page 2-23)
Personal protective equipment:
• Protective goggles
• Protective gloves
• Protective clothes
• Safety shoes
ZTKS0156 / Z31820 / Rev.: 03
87
Troubleshooting
6.2 Problem
6.2.1 During Transportation
Indicator Possible reason Solution By
Tilt Watch / Shock
Watch activated.
Visible damage. Careless transporta-
Careless transportation.
tion.
6.2.2 During Assembling
1. Accept delivery with
reservation.
2. Remark the extent of
damage in the transport
documents.
3. Start complaint process.
1. Accept delivery with
reservation.
2. Remark the extent of
damage in the transport
documents.
3. Start complaint process.
Approved
Customer
Personnel
Approved
Customer
Personnel
Indicator Possible reason Solution By
Ceiling height too
low for assembling
on magnet stand.
Ceiling height too
low for inserting the
helium level sensor.
Helium bore tube
and radiation shield
are not concentric.
Continued on next page
88
Site does not meet
the required conditions.
Site does not meet
the required conditions.
Alignment is not
correct.
Choose another site that
meets the required conditions.
Insert the helium level sensor
before mounting the magnet
stand.
Check fixation of the
alignment rods.
Bruker Service
Bruker Service
Bruker Service
ZTKS0156 / Z31820 / Rev.: 03
Troubleshooting
Continued from page before
Indicator Possible reason Solution By
Helium bore tube
and radiation shield
are not concentric.
Vacuum valve
collides with the
magnet stand.
Vacuum in RT vessel
does not reach
-8
5x10
bar within
48 hours.
Alignment rod is
loose or broken.
Reduction flange is
not concentric.
Vacuum valve
collides with the
magnet stand.
O-rings may be
damaged.
Defective pumping
line.
Defective pumping
unit.
Replace alignment rod
a
.
Bruker Service
Check orientation. Bruker Service
Turn the vacuum valve. Be
Bruker Service
careful if the RT vessel is
evacuated.
Check and clean O-rings and
Bruker Service
slots; replace O-rings if
necessary:
• of the vacuum valve
• of the drop-off plate
• of the reduction and
sealing flanges
• of the bottom plate
Check pumping line between
a
Bruker Service
the cryostat and vacuum
pumping unit; change if
necessary.
Check pumping unit:
A pressure below 1 x 10
-9
Bruker Service
bar
must be reached with a
closed sealing plug.
Room temperature
bore tube has scratches or dust on the
sealing surfaces.
Moisture within the
RT vessel.
Check sealing surfaces on the
room temperature bore tube:
No scratches and no dust
should be visible.
Pump and flush the RT vessel
several times with dry nitro-
Bruker Service
Bruker Service
gen gas.
Super insulation
touches RT vessel or
bore tube or
radiation shield.
Super insulation was
not fixed correctly
during assembly.
Fix super insulation on the
outer radiation shield with
polyester tape
a
. Carefully
prevent any connection
Bruker Service
between different vessels or
bore tubes in the cryostat.
a. For this work the bottom plate has to be removed. Check the suspension tubes of the helium vessel
are not broken. Install the safety device for fall protection (not supplied). Contact Bruker Service
Headquarter for further information.
ZTKS0156 / Z31820 / Rev.: 03
89
Troubleshooting
6.2.3 During Cool Down
Indicator Possible reason Solution By
Precooling with
liquid nitrogen continue too slowly.
Precooling with
liquid nitrogen continue too quickly.
Vacuum in RT vessel
does not reach
-8
5x10
bar.
Empty transport
dewar.
Transfer pressure
too low.
Transport dewar is
leaky; no transfer
pressure may be
applied.
Transfer pressure
too high.
O-rings may be
leaky.
O-rings may be frozen due to contact
with liquid nitrogen.
Refill or change transport
dewar.
Increase transfer pressure
slightly.
Check transfer dewar and
change if necessary.
Stop precooling. Adjust
correct transfer pressure.
Check and clean O-rings and
slots; change O-rings if
necessary:
• of the vacuum valve
• of the drop-off plate
• of the reduction and
sealing flanges
• of the bottom plate
a
1. Stop precooling.
2. Warm up O-ring with
warm air
3. Wait until the vacuum
recovers.
4. Prevent liquid nitrogen
from splashing on
O-rings.
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Bruker Service
90
Defective pumping
line.
Defective pumping
unit.
a. see note on page before
Continued on next page
Check pumping line between
the cryostat and vacuum
pumping unit; change if
necessary.
Check pumping unit:
A pressure below5 x 10
-8
bar
must be reached with a
closed sealing plug.
Bruker Service
Bruker Service
ZTKS0156 / Z31820 / Rev.: 03
Troubleshooting
Continued from page before
Indicator Possible reason Solution By
RT vessel becomes
cold and wet.
Cold spot in the
RT-bore.
The helium flow
system becomes
very cold and icy
during pumping and
flushing with helium
gas.
After some intervals
of pumping and flushing it is not possible
to reach a vacuum in
the range of
0.001 bar.
Vacuum is broken or
less than
-6
1x10
bar.
Cold leak after
transportation.
Alignment not
correct.
liquid nitrogen
remains in the
helium vessel,
boiling off strongly
during pumping.
The globes in the
quench valves are
not fitting correctly in
the O-rings and thus
the quench valves
are leaky.
Liquid nitrogen
remains in the
helium vessel,
boiling off strongly
during pumping.
• Do not remove pumping
unit until liquid helium fillin is finished.
• Continue as in problem
Vacuum in RT vessel
does not reach
-8
5x10
bar above
1. Stop cool down.
2. Warm up cryostat.
1. Stop cool down.
2. Warm up cryostat.
3. Align the vessels.
1. Stop pumping.
2. Carefully remove all
liquid nitrogen through
the precooling tube.
3. Check with the dipstick to
be sure that the helium
vessel is completely
empty of liquid nitrogen
and of frozen nitrogen
(nitrogen ice).
1. Stop pumping.
2. Remove frozen air and
frozen moisture with
warm helium gas.
3. Slightly grease the
O-rings and check the
position of the globes.
4. Check with the dipstick to
be sure that the helium
vessel is completely
empty of liquid nitrogen
and of nitrogen ice.
1. Stop pumping.
2. Carefully remove all
liquid nitrogen through
the precooling tube.
3. Check with the dipstick to
be sure that the helium
vessel is completely
empty of liquid nitrogen
and of frozen nitrogen
(nitrogen ice).
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Continued on next page
ZTKS0156 / Z31820 / Rev.: 03
91
Troubleshooting
Continued from page before
Indicator Possible reason Solution By
Nitrogen ice in the
helium vessel.
Transfer of liquid
helium does not
start.
Pumping intervals
during pumping and
flushing were too
long and remaining
nitrogen was boiling
off and got frozen.
The transport dewar
is empty.
The transfer pressure in the transport
vessel is too low.
The transfer dewar
is leaky, there is no
transfer pressure
built up.
1. Warm up the magnet coil
with warm helium gas
through the precooling
tube until the whole coil is
warmer than 90 K.
2. Repeat pumping and
flushing and carefully
check with the dipstick to
be sure that the helium
vessel is completely
empty of liquid nitrogen
and of frozen nitrogen
(nitrogen ice).
Refill or change transport
dewar.
Increase the transfer pressure.
Check the transport dewar for
leakage. Tight all connections.
Bruker Service
Bruker Service
Bruker Service
Bruker Service
The cool down of the
magnet coil does not
continue although
helium is transferred.
Continued on next page
The siphon or the
helium transfer line
are blocked with ice.
The helium transfer
line is defective.
The extension is not
mounted on the
helium transfer line.
Check the siphon and helium
transfer line for blockages,
remove ice with warm helium
gas.
Check the helium transfer line
for icing. If there are cold
spots visible, replace the
helium transfer line.
Mount the extension piece on
the helium transfer line.
Check the helium transfer line
to be inserted completely into
the siphon.
Bruker Service
Bruker Service
Bruker Service
92
ZTKS0156 / Z31820 / Rev.: 03
Troubleshooting
Continued from page before
Indicator Possible reason Solution By
The zero reading of
the helium level sensor can not be adjusted at the beginning
of cooling down with
liquid helium.
The helium level
does not reach
100% after cooling
down.
After cool down the
helium boil off is
higher than specified
(up to 5 times).
The helium level
sensor is not connected correctly with
the connector in the
helium flow system.
The helium level
sensor is defective.
The transport dewar
is empty, no more
helium is transferred.
The helium level
sensor is disturbed
by the transfer line’s
extension piece.
Usual behavior.
A few days are
necessary for the
radiation shields and
the insulation to
reach scheduled
temperatures.
Check the connection in the
helium fill-in turret between
helium level sensor and connector.
Check the helium level sensor
with the 0% calibration plug.
Refill or change transport
dewar.
1. Stop the liquid helium
transfer.
2. Remove the transfer line.
3. Measure the helium level
after some minutes
without the transfer line.
Wait a few days and check
helium boil off.
The presence of the current
lead in the current lead turret
during energizing and
shimming helps to cool down
the radiation shield due to
higher helium flow.
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Temperature of the
radiation shield
decreases too slowly
(if T
> 250 K after
RS
pre-cooling with
liquid nitrogen)
2 days after cool
down the T
RS
is still
higher than set value
(alarm of External
Temperature Control
Unit)
Cryogenic Refrigerator not operating.
Cryogenic Refrigeration operating not
correct
Cryogenic Refrigerator performance not
sufficient.
Alarm default settings of the External
Temperature Control
Unit or the console
not correct.
Cold head not mounted correctly.
Start Cryogenic Refrigerator. Bruker Service
See ”During Operation of the
Bruker Service
Cryogenic Refrigerator” on
page 6-102.
See ”During Operation of the
Bruker Service
Cryogenic Refrigerator” on
page 6-102.
Check set values (see
Bruker Service
separate manual of the External Temperature Control Unit
and of the console)
See chapter ”Mounting the
Bruker Service
Cryogenic Refrigerator Parts”
on page 4-54.
ZTKS0156 / Z31820 / Rev.: 03
93
Troubleshooting
6.2.4 During Energizing and Shimming
Indicator Possible reason Solution By
The current lead can
not be inserted
completely into the
connector.
Main coil heater test
fails.
Setting of sense
voltage fails.
The connector is
covered with ice.
(frozen moisture or
nitrogen ice).
The shorting plug
was not removed.
The orientation of
the current lead is
not correct.
Defective power
supply.
Connector or cables
defective.
The main coil heater
switch is "OFF".
The main coil switch
is not opened.
The main coil heater
current is not correct. The main coil
switch is not opened.
Carefully remove the ice with
warm helium gas.
To remove small ice spots use
the dipstick or the precooling
tube as tubing for the warm
helium gas.
Remove the shorting plug
with the shorting plug tool.
Turn the current lead carefully
until it can be inserted
correctly into the connector.
Replace the power supply Bruker Service
Clean connectors or change
cables if necessary.
Switch the main coil heater to
"ON" and check the main coil
heater current to be adjusted
correctly.
Adjust main coil heater
current correctly.
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Current lead can not
be removed.
Continued on next page
94
The auxiliary shorting plug is inserted
in the current lead
turret by mistake and
makes a short circuit
across the main coil.
The connector is
covered with ice
(frozen moisture or
nitrogen ice).
Remove the auxiliary shorting plug and insert it in the
helium fill-in turret.
Carefully remove the ice with
warm helium gas over the
helium flow system. To
remove small ice spots from
the connector use the dipstick
or the precooling tube as
tubing for the warm helium
gas.
Bruker Service
Bruker Service
ZTKS0156 / Z31820 / Rev.: 03
Troubleshooting
Continued from page before
Indicator Possible reason Solution By
Shorting plug cannot
be removed.
The magnet system
quenches
The main coil switch
can not be closed on
field.
The connector is
covered with ice
(frozen moisture or
nitrogen ice).
Loss of
superconductivity.
The helium level was
too low for energizing, cycling,
shimming,
de-energizing.
The power supply is
defective. The main
current is oscillating.
The helium level is
too low for energizing. The main coil
switch is not covered
with liquid helium.
Carefully remove the ice with
warm helium gas. To remove
small ice spots use the dipstick or the precooling tube as
tubing for the warm helium
gas.
See chapter ”After a
Quench” on page 6-107.
See chapter ”After a
Quench” on page 6-107.
Replace the power supply. Bruker Service
Never try to energize the
magnet with less than the
"minimum level during energizing" in the helium vessel.
Bruker Service
Bruker Service
Bruker Service
Bruker Service
Shim current can not
be set correctly.
Shims do not affect
the NMR signal.
Continued on next page
The power supply is
defective. The main
current is oscillating.
The control cable is
not connected correctly to the current
lead or to the power
supply.
Switch „Main Coil/
OFF/Shim Coil“ in
wrong position.
Shim heater current
is not correct. The
shim switches are
not opened.
Replace the power supply. Bruker Service
Connect the control cable correctly to current lead and
power supply.
Change the switch position Bruker Service
Set the shim heater current to
the specified value (see
Appendix Technical Data)
Bruker Service
Bruker Service
ZTKS0156 / Z31820 / Rev.: 03
95
Troubleshooting
Continued from page before
Indicator Possible reason Solution By
Magnet system does
not reach specification.
Magnetic material
inside RT bore tube.
Large ferromagnetic
parts are in the
vicinity of the
magnet system.
Carefully clean the RT bore
tube.
1. Keep the maximum possible distance between
the magnet system and
ferromagnetic parts.
2. Repeat shimming.
6.2.5 During Operation of the Magnet Stand
In case of doubt contact Bruker Service and refer to the supplied manual of the Magnet
Stand
Indicator Possible reason Solution By
The NMR spectrum
shows massive
disturbances.
The pneumatic controller is in DOWN
position.
Magnet system has
direct mechanical
contact with the floor
via accessories.
Switch pneumatic controller to
UP position.
Identify and eliminate contact
point. Arrange lines in loose
S- or U shapes
If the problem is still not
solved, contact Bruker
Service.
Bruker Service
Bruker Service
Approved
Customer
Personnel
Approved
Customer
Personnel
Approved
Customer
Personnel
96
Magnet system has
physical contact to
the magnet stand.
Piston of the isolator
is not centric or
touches its casing.
T-safety brakets
touches the pillar.
Floor vibrations in
vertical direction.
Floor vibrations in
horizontal and vertical direction.
Continued on next page
Check leveling; adjust if
necessary.
Align magnet stand. Bruker Service
Align magnet stand. Bruker Service
Replace elastomeric isolators
with air damped isolators.
Replace air damped isolators
with air piston isolators.
Bruker Service
Bruker Service
Bruker Service
ZTKS0156 / Z31820 / Rev.: 03
Troubleshooting
Continued from page before
Indicator Possible reason Solution By
The isolator of the
magnet stand does
not reach the operating position.
Magnet system
achieves working
position jerkily.
Pneumatic controller in DOWN
position.
The pressure of the
gas supply is too
low.
The magnet system
is not leveled correctly.
Defective leveling
valve.
Defective membrane
of an isolator.
Piston is not centric
or touching its
casing.
Switch pneumatic controller to
UP position.
Check the pressure of the gas
supply. It must be in the range
of 5to8bar (70to112psi).
If the problem is still not
solved, contact Bruker
Service.
Stop the pneumatic isolators.
Check the leveling of the
cryostat.
Exchange leveling valve or
isolator.
Exchange leveling valve or
isolator.
Align magnet stand. Bruker Service
Approved
Customer
Personnel
Approved
Customer
Personnel
Approved
Customer
Personnel
Bruker Service
Bruker Service
Bruker Service
Audible loss of air Defective membrane
or defective leveling
valve of an isolator.
Hose connector is
defective or loose.
Velocity of lifting or
lowering too high.
Wrong adjustment of
the flow control
valve.
Exchange leveling valve or
isolator.
Insert hoses correctly and
tighten screws.
Close restrictor of the flow
control valve completely; then
open it a half turn.
Bruker Service
Bruker Service
Bruker Service
ZTKS0156 / Z31820 / Rev.: 03
97
Troubleshooting
6.2.6 During Standard Operation
Indicator Possible reason Solution By
The helium boil off
decrease to zero.
The atmospheric
pressure is increasing.
The helium flow
system is covered
with ice.
The helium flow
system or the suspension tubes are
blocked with ice.
Usual behavior.
Watch helium boil off daily.
Contact Bruker Service
immediately! Do not try to
remove ice of the helium flow
system!
If the problem is still not
solved, contact Bruker
Service.
WARNING:
Cryogenic Agents
Quench
Blow in warm helium gas
carefully through an
applicable tube. Do not insert
it more than 600 mm from the
top of the helium turrets.
Approved
Customer
Personnel
Approved
Customer
Personnel
Approved
Customer
Personnel
Bruker Service
The helium boil off is
too high.
Continued on next page
The helium level
meter is permanently
on (service mode) or
used often.
The atmospheric
pressure is decreasing.
Switch off helium level sensor.
Reduce helium level measurement (during measuring of
the helium level an amount of
helium boils off due to the
heat input of the helium level
sensor;
for reporting the helium boil
off a weekly measurement is
sufficient).
Usual behavior.
Watch helium boil off weekly.
If the problem is still not
solved, contact Bruker
Service.
Approved
Customer
Personnel
Approved
Customer
Personnel
Approved
Customer
Personnel
98
ZTKS0156 / Z31820 / Rev.: 03
Troubleshooting
Continued from page before
Indicator Possible reason Solution By
Continue of:
The helium boil off is
too high.
RS temperature
shield to high.
Vacuum reduced. Rebuild vacuum, see chapter
”Rebuilding the Vacuum”
on page 4-53
The radiation baffles
are not inserted in
the current lead
turret.
Cryogenic Refrigeration not sufficient.
Alarm default settings not correct.
Vacuum reduced. Rebuild vacuum, see chapter
Insert the radiation baffles into
the current lead turret.
See chapter ”During Opera-
tion of the Cryogenic Refrigerator” on page 6-102.
Check set values (see
separate manual of the External Temperature Control
Unit).
If the problem is still not
solved, contact Bruker
Service.
”Rebuilding the Vacuum”
on page 4-53.
Bruker Service
Bruker Service
Approved
Customer
Personnel
Approved
Customer
Personnel
Approved
Customer
Personnel
Bruker Service
Quench Loss of
superconductivity.
Cold spots within the
RT bore.
RT vessel is wet and
cold.
Not correct helium
level warning out of
supplied NMR software.
Helium level at
constant level, no
change during days.
Continued on next page
Alignment not correct.
Vacuum reduced. Contact Bruker Service
Helium level sensor
defective.
Helium level sensor
defective.
See chapter ”After a
Quench” on page 6-107
Contact Bruker Service
immediately!
Contact Bruker Service. Approved
immediately!
Contact Bruker Service
immediately!
Contact Bruker Service
immediately!
Approved
Customer
Personnel
Customer
Personnel
Approved
Customer
Personnel
Approved
Customer
Personnel
Approved
Customer
Personnel
ZTKS0156 / Z31820 / Rev.: 03
99
Troubleshooting
Continued from page before
Indicator Possible reason Solution By
WARNING:
Low Temperature
Not correct helium
level warning out of
supplied NMR software.
Helium level at constant level, no
change during days.
Helium level sensor
defective.
Helium level sensor
defective.
Replace helium level sensor
(see chapter ”Replacement
of the Helium Level Sensor”
on page 6-109)
Replace helium level sensor
(see chapter ”Replacement
of the Helium Level Sensor”
on page 6-109)
Bruker Service
Bruker Service
100
ZTKS0156 / Z31820 / Rev.: 03
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