Bruker CryoProbe User manual

BRUKER
CryoProbe System
User Manual
Version 001

The information in this manual may be altered without notice.
BRUKER accepts no responsibility for actions taken as a result
of use of this manual. BRUKER accepts no liability for any mis-
takes contained in the manual, leading to coincidental damage,
whether during installation or operation of the instrument. Un-
authorised reproduction of manual contents, without written
permission from the publishers, or translation into another lan-
guage, either in full or in part, is forbidden.
This manual was written by
M. Schick, D. Marek, R. Triebe, D. Oberli
© October 17, 2000: Bruker AG
Fällanden, Switzerland
P/N: Z31551
DWG-Nr: 1258001

CryoProbe User Manual BRUKER 3 (107)
Contents
Contents ............................................................... 3
1 Safety .................................................................... 7
1.1 Terms and symbols .............................................................. 7
1.2 Disclaimer ........................................................................... 8
1.3 Emergency .......................................................................... 8
1.4 Personnel safety .................................................................. 9
1.5 Safety of CryoProbe equipment ......................................... 11
1.6 First aid ............................................................................. 11
2 Introduction ........................................................ 13
2.1 How to use this manual ..................................................... 13
2.2 CryoProbe System overview .............................................. 13
2.3 Conventions ...................................................................... 13
3 System description ............................................. 15
3.1 CryoProbe ......................................................................... 15
Sample temperature control .......................................... 16
Reproducibility .............................................................. 16
Differences to a conventional probe .............................. 16
3.2 CryoPlatform ..................................................................... 17
Mounting Hardware ....................................................... 18
CryoCooling Unit .......................................................... 19
He Compressor ............................................................. 21
3.3 Cryo-compatible preamplifier assembly ‘HPPR CRP’ ......... 22
3.4 Water chiller (optional) ....................................................... 23
3.5 Principle of operation ......................................................... 24
Gifford-McMahon cycle refrigerator ............................... 24
3.6 Software ............................................................................ 26
4 Standard procedures .......................................... 27
4.1 LIMITATIONS - WARNINGS sheet .............................................. 27
4.2 Handling ............................................................................ 27
4.3 Mounting ........................................................................... 28
4.4 Sample spinning test ......................................................... 33
4.5 Joining the CryoCoupler .................................................... 34
4.6 Connecting ........................................................................ 36
4.7 Power-on ........................................................................... 39
4.8 VT setup ........................................................................... 40
Sample Safety Option ................................................... 42
4.9 Cool-down ......................................................................... 42
4.10 HPPR CRP configuration ................................................... 44

4 (107) BRUKER CryoProbe User Manual
Contents
4.11 Low temperature limit in sample cavity .............................. 45
4.12 Tuning and matching ......................................................... 47
4.13 Shimming and Lock-in ....................................................... 48
4.14 Warm-up ........................................................................... 49
4.15 Removal ........................................................................... 49
4.16 Power-down ...................................................................... 52
4.17 Spectrometer operation with conventional probes .............. 53
5 Recommended NMR parameters ......................... 55
5.1 General ............................................................................. 55
5.2 Samples and spinners ....................................................... 55
5.3 Sample temperature control .............................................. 55
Measurements above TVT gas+ 3°C ............................. 56
Measurements below TVT gas+ 3°C ............................. 57
Tuning the regulation loop ............................................ 57
5.4 Wiring ............................................................................... 57
Preamplifier .................................................................. 58
Additional RF filters ...................................................... 58
5.5 RF power limitations .......................................................... 58
Peak RF power ............................................................. 58
Simultaneous hard pulses ............................................. 59
Average RF power ........................................................ 59
5.6 Receiver setting ................................................................ 60
5.7 Shimming .......................................................................... 60
Gradient shimming ....................................................... 60
H2O samples ................................................................ 60
5.8 Solvent suppression .......................................................... 61
5.9 Gradients .......................................................................... 61
5.10 Pulse programs ................................................................. 61
5.11 Automation ....................................................................... 61
6 Monitoring and Maintenance ............................... 63
6.1 Displays & Diagnostics ...................................................... 63
CryoTool interface ........................................................ 63
Warm-up needed soon request ...................................... 63
CryoProbe insulation indicator ...................................... 64
6.2 Periodic checks ................................................................. 64
Log-book ...................................................................... 64
Logfile .......................................................................... 66
Replacement of the He steel-cylinder ........................... 66
6.3 Software update ................................................................ 67
6.4 Cleaning ........................................................................... 67
Cleaning the sample cavity ........................................... 67
Panels and housings .................................................... 68
6.5 Scheduled maintenance .................................................... 68
7 Troubleshooting .................................................. 71
7.1 Emergency procedures ..................................................... 71
Emergency Off ............................................................. 71
7.2 First diagnosis .................................................................. 73

Contents
CryoProbe User Manual BRUKER 5 (107)
Logfile .......................................................................... 73
7.3 Fuses and reset buttons .................................................... 73
7.4 General failure .................................................................. 74
No mains ...................................................................... 74
Spinning problems ........................................................ 74
Indicator on CryoProbe sticks out .................................. 75
CryoController failure .................................................... 75
Leak in He supply ......................................................... 75
7.5 Cool-down problems .......................................................... 75
COOL DOWN command is ignored .................................... 75
Insufficient vacuum ....................................................... 76
He Compressor does not run ........................................ 76
Cool-down doesn’t reach cold state ............................... 77
7.6 Cold operation problems .................................................... 77
COLD flashes ................................................................. 77
Emergency warm-up ..................................................... 77
CryoProbe temperature unstable ................................... 78
Condensed water or ice on the CryoProbe .................... 78
Sample temperature problems ...................................... 79
Unusual sounds ............................................................ 79
Mains power interrupt ................................................... 79
VT gas interrupt ............................................................ 81
Cooling water leakage .................................................. 81
He leakage ................................................................... 81
He steel-cylinder empty ................................................ 81
Pneumatic gas pressure too low ................................... 81
‘Shot’ noise ................................................................... 82
7.7 RF problems ...................................................................... 82
Tuning/Matching not OK ................................................ 83
Lock problems .............................................................. 83
Spurious signals ........................................................... 84
7.8 Accidental misoperation ..................................................... 85
8 Bruker contact .................................................... 87
8.1 CryoProbe information ....................................................... 87
8.2 CryoProbe service ............................................................. 87
8.3 Fault report ....................................................................... 87
A Related documents ............................................. 89
B Conversion of metric units ................................. 91
C Frequently asked questions ............................... 93
C.1 System configuration ......................................................... 93
C.2 NMR operation .................................................................. 94
C.3 Basic aspects .................................................................... 95
D Glossary .............................................................. 97

6 (107) BRUKER CryoProbe User Manual
Contents
Figures ............................................................... 103
Tables ................................................................ 105

CryoProbe User Manual BRUKER 7 (107)
Safety 1
1000000
Read these safety instructions carefully and make them accessible to everybody
working with the CryoProbe System. A CryoProbe can be operated easily and
safely provided the correct procedures are obeyed and certain precautions ob-
served.
Terms and symbols 1.1
0
WARNING: Disregard of this may lead to personal injury.
CAUTION: Disregard of this may permanently damage the system.
IMPORTANT: Disregard of this can lead to malfunctions.
NOTE: Hint for good operating practice.
Figure 1.1. Hot surface!
The labelled item may be hot. Be careful when touching it!
Figure 1.2. High voltage!
The labelled item houses a dangerous voltage. Do not open it!
Figure 1.3. Dangerous device!
The labelled item presents a potential hazard. Read the manual if
you don’t know how to handle it!
Figure 1.4. Cold surface!
The labelled item may be cold. Be careful when touching it!

8 (107) BRUKER CryoProbe User Manual
Safety
Disclaimer 1.2
0
BRUKER is not responsible or liable for any injury or damage that occurs as a con-
sequence of non-approved manipulations on the CryoProbe System.
Emergency 1.3
0
The main switch on the CryoCooling Unit front (see "Control indicators on the
CryoCooling Unit front" on page 19) serves as an EMERGENCY OFF. It powers
down the systems for cryogenic cooling, vacuum, sensors, and helium gas com-
pression. All valves are reset to their default positions. The CryoPreamps inside
the CryoProbe, however, are not affected by an EMERGENCY OFF because they
are supplied from the HPPR. If the system is kept OFF, it will slowly warm up due
to thermal conduction.
NOTE: Because an EMERGENCY OFF shuts down also the supervisor electronics,
it should only be used as a last resort.
When powered on again, the CryoController will first analyze the system state and
determine a way to reach a stable situation before restarting the He Compressor
etc.
See "Emergency Off" on page 71 for details.
Figure 1.5. Wear protective gloves!
Put on protective gloves before handling the labelled item.
Figure 1.6. Wear protective goggles!
Put on protective goggles before handling the labelled item.
Figure 1.7. Strong attraction by magnet!
The item is magnetic and presents a potential hazard in the vicinity of
a magnet. Keep it away from the magnet!
!

Personnel safety
CryoProbe User Manual BRUKER 9 (107)
Personnel safety 1.4
0
All persons who work with or in the close vicinity of a CryoProbe System must be
informed about its safety issues and emergency procedures.
WARNING: Do not disconnect any tube or cable from a running CryoProbe Sys-
tem unless WARM and UNPLUG light up on the CryoCooling Unit front panel.
If in doubt: Put on goggles and protective gloves!
WARNING: Do not manipulate connectors, screws, valves or pressure relief
valves other than those that are explicitly described in the CryoProbe System
manuals for operator use.
Inherent safety
The CryoProbe System is designed for inherent safety. Pressure relief valves,
sensors, and error handling in hardware and software have been included to pro-
tect operator, equipment, and environment.
CE certification
CryoProbe, CryoCooling Unit and He Compressor are CE certified.
Technically qualified personnel only
Only persons with a basic technical understanding of electricity, pressurized gas
systems, and cryogenics should operate and maintain a CryoProbe System. User
interface, system messages, and manuals require a good understanding of the
English language.
No user-serviceable parts inside
There are no user-serviceable parts inside a CryoProbe, a CryoCooling Unit cabi-
net, a He Compressor, or any other component of a CryoProbe System. Do not
open these devices.
BRUKER warranty expires if the CryoProbe was opened by unauthorized per-
sonnel.
WARNING: Two persons are required to lift the heavy panels of the CryoCooling
Unit. Be careful with the panels, there might be sharp edges on their inside which
could cause injuries.
WARNING: If you have to work with an open CryoCooling Unit cabinet, put on
protective goggles and gloves.
Pressurized cold helium gas cycle
The CryoPlatform works with helium gas (He) that is pressurized up to about
25 bar and cooled to cryogenic temperatures around 20 K. All pressurized parts
are kept in strong enclosures which are designed to hold back gas jets or ejected
particles in case of a rupture. If unprotected skin is exposed to cold He, severe
cold burns are possible.
The helium gas volume inside the cryogenic cooling cycle is small and presents
virtually no danger of suffocation. However, the He steel-cylinder contains a sub-
stantial gas volume, note the warning below ("Pressurized helium gas supply"
on page 10).

10 (107) BRUKER CryoProbe User Manual
Safety
NOTE: If a pressure or vacuum leak appears, the CryoProbe System will be auto-
matically stopped and warmed up to ambient temperature.
Pressurized helium gas supply
WARNING: Move, connect, and operate the He steel-cylinder carefully. Obey all
safety precautions pertinent to high pressure gas containers and magnetic ob-
jects.
WARNING: The He steel-cylinder and its entire transport path must always be
outside the 0.5 mT range of the magnet.
WARNING: Fix the He steel-cylinder reliably to a wall. All local safety regulations
for the installation of pressurized gas systems must be obeyed.
The helium pressure hose between the He steel-cylinder and the CryoCooling
Unit carries a steel wire that must be fixed to the units at its ends. If crossing of
walkways cannot be avoided, the He Hose must be covered or buried. Moreover,
the He Hose must be fixed to a wall or to the floor once every meter.
WARNING: If the He Hose is not fixed it can whip around in case of a rupture.
WARNING: If a large quantity of helium gas escapes from the He steel-cylinder
during a short period, there is a danger of suffocation, particularly in small rooms.
Care for good ventilation and fresh air supply after an accidental release of large
quantities of helium gas.
Overpressure release noise
Overpressure in the system is avoided by software control and mechanical safety
valves. In case of malfunction of software as well as human interference into valve
settings, the release valves can open with an extremely loud bang! The sound
protection cabinet will reduce the noise to a safe level, therefore do not operate
with an open cabinet.
WARNING: If a service action on an open CryoCooling Unit cabinet cannot be
avoided while the He Compressor runs or while the helium gas supply is manipu-
lated, the ears must be protected.
Electrical safety
The CryoCooling Unit’s degree of protection against electrical hazard complies
with IEC IP20, i.e. all electrical parts are protected against touching.
WARNING: All electrical connectors must be used as supplied by BRUKER. Do not
substitute them by other types.
No hazardous substances
There are virtually no substances in a CryoProbe System that could be hazardous
for an NMR user. See the CryoProbe Installation manual for materials that need
special consideration upon relocation or disposal.
Lifting the CryoProbe
WARNING: Two people are needed to insert and remove the CryoProbe.
When kneeling down at the magnet bore, your body posture is not suited to lift the
heavy CryoProbe (~12 kg) on your own. For two people it is very easy. Take care
not to injure your back!

Safety of CryoProbe equipment
CryoProbe User Manual BRUKER 11 (107)
Magnetic stray field
When working within the 0.5 mT stray field of the magnet, all magnetic parts and
tools must be avoided or handled with great care.
CAUTION:
Deposit mechanical watches and cards with a magnetic stripe (e.g. credit cards)
outside the 0.5 mT range of the magnet.
Safety of CryoProbe equipment 1.5
0
CAUTION:
- Do not bend the CryoProbe.
Do not hold the CryoProbe at its upper tube, always carry it at its body.
- Do not open the CryoProbe.
There are no user-serviceable parts inside. A CryoProbe cannot be sealed
or reassembled without special equipment. Even undoing some screws can
destroy factory settings and will in general render the CryoProbe unusable.
- Never force a CryoCoupler into position.
- Do not obstruct the operation of the safety-valves on the top and front faces of
the CryoProbe body.
- Do not move a cryogenically cold device.
- Do not try to fix a leak on a cold part because cracking of frozen o-rings, valves
etc. may occur.
- Excessive RF power can destroy the CryoProbe or the HPPR CRP. Obey the
limitations given on the specific ‘LIMITATIONS - WARNINGS’ sheet. See also
"RF power limitations" on page 58.
First aid 1.6
0
If cold helium gas comes in contact with eyes or skin, immediately flood the affect-
ed area with cold or tepid water.

12 (107) BRUKER CryoProbe User Manual
Safety

CryoProbe User Manual BRUKER 13 (107)
Introduction 2
2000000
BRUKER CryoProbes™ offer a dramatic increase in signal-to-noise ratio (S/N) by
reducing the operating temperature of the NMR coil assembly and the preamplifi-
er. Their spectroscopic handling is very similar to a conventional probe. While the
sample temperature is stabilized at a user-defined value around room tempera-
ture, the NMR coil assembly - located a few millimeters from the sample - is
cooled with cryogenic helium gas. An automatic closed-cycle cooling system con-
trols all functions and guarantees excellent stability during short and long-term ex-
periments. As a result, the system is easy to handle. CryoProbes open new fields
for NMR applications e.g. where low sample concentration or long measurement
time are critical.
How to use this manual 2.1
0
This CryoProbe System User Manual describes the CryoProbe System and its
daily operation.
If you have a specific question, use
-"Contents" on page 3,or
-"Frequently asked questions" on page 93“
to locate the answer.
Novice users of a CryoProbe System should read "Safety" on page 7.
Further information can be found in the manuals listed in "Related documents"
on page 89.
CryoProbe System overview 2.2
0
A CryoProbe System consists of several subunits: CryoProbe, CryoPlatform,
cryo-compatible HPPR CRP, He steel-cylinder, and optional water chiller (Figure
2.1.).
The term ‘CryoPlatform’ summarizes the parts required to operate a CryoProbe
such as the CryoCooling Unit, the He Compressor, the Mounting Hardware at the
magnet etc. It is compatible with all BRUKER CryoProbes and only one per spec-
trometer is needed.
Conventions 2.3
0
SMALL CAPS ITALIC setting of a hardware switch or button
Courier small contents of a file

14 (107) BRUKER CryoProbe User Manual
Introduction
Courier small italic system response
Courier file or directory name
Courier bold Unix™ or Windows™ NT keyboard command
Courier italic bold BRUKER NMR Suite keyboard command
Times bold Unix or Windows NT object clicked with the mouse
Times italic bold BRUKER NMR Suite object clicked with the mouse
Times italic host name, User name etc.
< > place holder
Figure 2.1. The CryoProbe™ System
AVANCE Console
Magnet
CryoProbeTM
He-Compressor
Water Cooled, European
Version: O00247
HPPR CRP
(Cryo-compatible HPPR Z003422
BRUKER
CryoPlatformTM
Default configuration: BH 0410
Room temperature He Gas
pressure lines & Cables
Length 6m: Z47199
Transferline
(Part of
CryoCooling
Unit)
BRUKER
Water
Chiller
(Optional)
Transferline
Support
Mounting Kit
for 500 MHz BRUKER
SB Magnet with Boss2
shim system: Z 46554
He Gas
cylinder
(to be
provided
by
customer)
Connenction to He-Gas
cylinder incl. Pressure
reduction valve:
Z46261
CryoCooling
Unit
With 2m Transferline:
Z45447
CryoProbe
Mounting
Hardware
Water
Chiller
Option
European
Version:
BH 0420

CryoProbe User Manual BRUKER 15 (107)
System description 3
3000000
CryoProbe 3.1
0
The CryoProbe™ is an NMR probe with the essential parts of the RF preamplifier
integrated. Both the NMR coil assembly and the CryoPreamp are cooled by cryo-
genic helium gas (He) to achieve an extremely efficient operation of the NMR coil
assembly and to significantly reduce thermal noise. Thus, the overall signal-to-
noise ratio is dramatically enhanced.
Figure 3.1. A CryoProbe™

16 (107) BRUKER CryoProbe User Manual
System description
Where applicable, the CryoPreamps, transmit/receive switches, RF filters for the
receiver pathways, and control circuits are built into the CryoProbe body.
The CryoProbe is connected to the CryoPlatform with the standardized CryoCou-
pler and He Transferline for cooling as well as with several sensor cables. It re-
quires special interface cables for the z-gradient and for the VT unit.
Technical data
Dimensions 190 ×365 ×95 mm [w ×d ×h]
(body only, excluding connectors)
length including front connectors: 383 mm
Overall height 578 mm (500 MHz), 628 mm (600 MHz)
Weight ~12 kg
Sample temperature control 3.1.1
The sample is kept at a temperature in a range specified on the ‘LIMITATIONS -
WARNINGS’ sheet which comes together with each individual probe. Its tempera-
ture is controlled and regulated in the usual way with a continuous gas flow. There
is a vacuum insulation between sample and cryogenically cooled NMR coil as-
sembly. Still, due to thermal radiation a slight steady cooling acts on the sample
from the surrounding CryoProbe cavity. This cooling, however, is easily compen-
sated by the regular VT gas flow.
Note the "Sample temperature control" on page 55.
Reproducibility 3.1.2
The performance characteristics of a CryoProbe do not change significantly with
time. Warm-up/cool-down cycles are of little effect on shim values, tuning &
matching, pulse angles, lineshape, or sensitivity. However, some fine tuning of
parameters might be necessary comparable to what is known from conventional
probes.
Differences to a conventional probe 3.1.3
Although the CryoProbe is in a way a regular high-resolution NMR probe, many of
its systems are unique and have not been used in an NMR system before. All us-
ers of a CryoProbe System must be aware of its differences to a conventional
probe to ensure appropriate use and maximum performance.
Mounting
The CryoProbe includes fragile parts and needs very careful handling. Since sev-
eral electronic components (e.g. preamplifier) and parts of the cooling system are
included in the CryoProbe, the weight is substantially increased as compared to
conventional probes. A special Mounting Hardware is attached directly to the
magnet bottom to carry the CryoProbe. Two people are needed for the actual lift-
ing of the heavy CryoProbe (~12 kg) into the magnet.

CryoPlatform
CryoProbe User Manual BRUKER 17 (107)
Connections
There are more connectors on the CryoProbe than on a conventional probe due
to the built-in preamplifiers and the necessary control circuits (see Figure 3.1.).
Sample handling, tuning, shimming
There are no differences to a conventional probe with regard to sample handling,
sample lift, and sample spinning. Samples with a diameter smaller than specified
can be used like in conventional probes.
A CryoProbe is tuned and matched like a conventional probe with actuators from
below. Before the usual wobb feature of XWIN-NMR can be used, the appropriate
RF pathway must be enabled with the command crpwobb. CryoProbes must not
be tuned or matched when warm!
Established shimming strategies are still valid and no unusual shim settings are to
be expected.
RF power
RF peak and average power must not exceed certain limits. Due to the high effi-
ciency of the CryoProbe, the limits are lower than for conventional probes. Power
levels for all kinds of RF pulses (hard, soft, shaped, CPD, spin-lock...) may be sig-
nificantly lower than on conventional probes. In particular, the decoupling power
required for a given RF field strength is usually much smaller than in a conven-
tional probe. See the specific LIMITATIONS - WARNINGS sheet, which is delivered
with each CryoProbe.
Length and power of RF pulses are calibrated as usual.
Sample temperature and minimum required VT gas flow
The sample is subjected to a rather high flow of VT gas specified on the ‘LIMITA-
TIONS - WARNINGS’ sheet which comes together with each individual probe. The
VT gas flow must be maintained at all times. This compensates for the slight cool-
ing due to thermal radiation from the surrounding CryoProbe.
Subsequent modifications
No modifications, upgrades, or frequency changes are possible for an existing
CryoProbe.
Acoustic noise
The CryoPlatform includes several mechanical pumps and compressors which
are sources of acoustic noise. A characteristic periodic hiss of the Gifford-McMa-
hon cooler is clearly audible from the CryoCooling Unit and the Flexlines despite
their acoustic insulation. The He Compressor and an optional water chiller are
also noisy but can conveniently be located in an adjacent room.
CryoPlatform 3.2
0
The CryoPlatform™ is required once per spectrometer and supplies the entire in-
frastructure for the operation of CryoProbes, i.e. the cooling and all control func-
tions. It is a push-button system which performs all operations needed for an
entirely automatic cool-down, cold operation, and warm-up of the probe. Although

18 (107) BRUKER CryoProbe User Manual
System description
capable of stand-alone operation, the CryoPlatform is fully integrated into the
AVANCE spectrometer system.
A CryoPlatform (Figure 3.2.) consists of CryoProbe Mounting Hardware at the
magnet, a CryoCooling Unit with an integrated He Transferline to the CryoProbe,
a Transferline Support, a separate He Compressor with water- or air-cooling,
Flexlines between He Compressor and CryoCooling Unit, a He Regulator on a He
steel-cylinder, an interface cable for the VT unit, and an optional magnet stand
modification for certain magnet types.
Not considered part of the ‘CryoPlatform’ are the CryoProbe, the cryo-compatible
HPPR CRP, the He steel-cylinder, the Gradient Filter Box, and an optional water
chiller.
Mounting Hardware 3.2.1
A special fixture must be mounted to the lower RT flange of the magnet bore to
carry the weight of the CryoProbe. The Mounting Hardware is attached to the
magnet flange with an interface plate which replaces the lower shim system at-
He Regulator
He Compressor
Transferline Support
CryoCooling Unit
Push buttons for
warm-up / cool-down
Magnet
HPPR CRP
He Transferline
CryoProbe
Vacuum bellows
Magnet stand
pillar brace
He Hose
He steel-cylinder
Figure 3.2. A CryoPlatform™

CryoPlatform
CryoProbe User Manual BRUKER 19 (107)
tachment ring. When not used for CryoProbe mounting, this plate does not inter-
fere with conventional probes.
CryoCooling Unit 3.2.2
The most prominent part of the CryoPlatform is the CryoCooling Unit. Inside, a so-
called ‘Coldhead’ expands compressed He and thereby cools it to cryogenic tem-
peratures. Cold He is then circulated through the CryoProbe via an insulated He
Transferline. Vacuum pumps maintain insulation of the CryoProbe and the Cryo-
Cooler. All operations are supervised by the built-in CryoController unit.
Controls on the CryoCooling Unit
Warm
warm
up
cool
down
Cold
Error
un-
plug
All buttons and indicators may illu-
minate to give a status display.
These three buttons can be
pressed for input.
Figure 3.3. Control indicators on the CryoCooling Unit front
I
O
Mains switch
‘EMERGENCY OFF’
OFF
EMERGENCY OFF

20 (107) BRUKER CryoProbe User Manual
System description
Status display by the control buttons
After pressing UNPLUG, any sensor cable can be removed from the CryoProbe
during ~1 min without causing an error.
ERROR reset
ERROR may light up in any of the above situations (Figure 3.4.) in addition to the
lights displayed. To reset the ERROR on the CryoCooling Unit front panel, press
cool
down
Power off Power-up bulb test Flushing
(preparing cool-down)
Cooling down Ready cold Almost cold /
(reduce decoupling!)
Warm-up needed soon Warming up with Warming up without Ready to unplug
CryoProbeactive heating active heating
Status lights:
= off
= on
= blinking
slightly over-heated
Cooling down,
ready for tuning
and shimming
Warm
warm
up
Cold
Error
un-
plug
Warm
warm
up
cool
down
Cold
Error
un-
plug
Warm
warm
up
cool
down
Cold
Error
un-
plug
Warm
warm
up
cool
down
Cold
Error
un-
plug
Warm
warm
up
cool
down
Cold
Error
un-
plug
Warm
warm
up
cool
down
Cold
Error
un-
plug
Warm
warm
up
cool
down
Cold
Error
un-
plug
Warm
warm
up
cool
down
Cold
Error
un-
plug
Warm
warm
up
cool
down
Cold
Error
un-
plug
Warm
warm
up
cool
down
Cold
Error
un-
plug
Warm
warm
up
cool
down
Cold
Error
un-
plug
Figure 3.4. Status display by the control buttons