Isoprime 100 - Automated Peak Centering in Analysis

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Isoprime User’s Guide

Version 1.02 IsoPrime100 User’s Guide Page 98 of 219

Further details are given in the Data Display chapter.

AUTO PEAK CENTRE

It is possible to include an auto peak centre in between samples during analysis. A method (MS

File) must be created and this can then be run in the sample list. An example MS file is shown

below:

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Assistance2
Isoprime100 User's Guide3
Warranty3
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Table of Contents5
Contents5
Site Requirements15
Benchtop Requirements15
Dimensions15
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Electrical Requirements16
Environmental Requirements17
Room Temperature17
Humidity17
Dust Free Environment17
Rotary Pump Exhaust Fumes17
Magnetic Fields18
Compressed Air18
System Description19
Introduction19
Ion Optics20
Overview20
The Ion Source21
Gas Inlet Probe23
Analyser Magnet24
Electromagnet24
Analyser Housing27
Collectors28
Triple Collector28
ESF Collector30
The Vacuum System33
Overview33
Pressure Measurement35
Pirani Gauge35
Penning Gauge35
Electronic Units35
Locations of the Electronic Units36
System Controller37
Source High Voltage Supplies38
Turbomolecular Pump Controller39
Head Amplifier39
Electromagnet Supply40
Mains Distribution40
Overview of Ionvantage42
Determining Version and Change Note Information42
Starting Ionvantage43
Closing down Ionvantage44
Closing Ionvantage after a Crash44
Structure of Ionvantage47
The Sample List47
The Tune Page48
The Inlet Editor48
The Script Message Window49
File Locations51
The Ionvantage Folder51
Ionvantage Projects52
Introduction52
Creating a New Project53
Switching between Projects55
Project File Structure56
Scope of Project Files57
The Sample List58
Running Samples from the Sample List58
Sample List Fields60
Editing the Sample List62
Setting up the Total Number of Rows62
Adding Samples62
Inserting Samples63
Deleting Samples63
Fill down64
Fill Series64
Editing Information in Cells65
Clearing Selected Cells65
Editing the Sample List Via an Autosampler Plate Layout66
Selecting Samples67
Inserting Samples67
Adding Samples67
Replacing Samples68
Editing Columns68
Modifying the Sample List Fields69
Using Sample List Format Files70
The Tune Page72
Pumping Control73
Pumping down73
Venting73
Tuning Control74
Source Control74
Tune Files76
Source Parameters77
Tuning the Mass Spectrometer78
Coarse Tuning the Ion Source79
Fine Tuning of Source Parameters83
Notes on Tuning83
Optimisation by Scanning Source Parameters84
Instrument Linearity85
Map Files87
Acquisition Map87
Display Map87
The Map Editor88
Edit Acquisition Map88
Edit Display Map89
Changing a Map File89
Editing Display Properties90
Enable Status - Rio Property93
Running a Scan94
Setting up a Peak Centre Scan95
Running a Peak Centre Scan96
Peak Display97
Auto Peak Centre98
Head Amplifier Zeroes99
The Function of Zeroes99
Electronic Zeroes100
Collector Zeroes100
Beam Zeroes Dialog101
Tune Page Methods102
Editing a Method102
Running a Method from the Tune Page105
Events106
Overview106
Peak Jump107
IO Command110
End of Acquire111
Scan112
Function114
Acquire Map115
Stopping an Acquisition116
Data Display116
Viewing Scans116
The Peak Display Window116
Peak Display Options117
Zooming in117
Options118
Templates119
Peak Centre Options120
Viewing Acquisitions121
View Data Display121
Loading Data Files121
Isoprime100 User's Guide121
Zooming in on Data123
Diagnostics and Security124
Isoprime100 Diagnostics124
PC Security127
Remote Control127
Anti-Virus127
Backing up128
Warranty128
Archiving128
Background Information129
Basics of Mass Spectrometry129
The Mass Spectrometer Equation129
Mass Spectrometers129
Analytical and Isotope Ratio Analysers130
Peak Shape130
Dispersion132
Resolution133
Vacuum System136
Vacuum Measurement136
Units of Pressure137
Gas Flow and Vacuums138
Viscous Flow138
Molecular Flow138
Pumps139
The Rotary Vane Pump140
The Turbomolecular Pump142
Pressure Gauges143
The Pirani Gauge143
The Penning Gauge144
The Principle of Continuous Flow144
Calculations and Corrections145
Enrichment Delta145
Isotopic Abundance (Atom %)145
Internal Reproducibility146
Standard Deviation ()146
Standard Error ( Mean)146
Carbon Dioxide Corrections (Craig Formulae)147
Nitrogen Corrections147
Standard Formula for High Enrichments148
Modified Formula for Low Enrichments148
Derivation of Nitrogen Formulae148
Other Analytical Considerations151
General Sequence of Data Reduction151
Sequence of Data Reduction152
A Simple Example for Carbon Dioxide154
Calculations Specific to Carbon Dioxide154
International Standards156
Atom% Carbon156
Calculations Specific to Nitrogen157
Atomic% Nitrogen157
Enriched Nitrogen Analysis157
Atom Percent Formulae158
Carbon Dioxide158
Nitrogen159
Oxygen159
Sulphur Compounds160
Nitrous Oxide (N 2 0)160
Maintenance162
Introduction162
Tools162
Emergency Fault Conditions163
Emergency Instrument Shutdown163
Electrical Power Failure164
Failure of Helium Supply166
Routine Maintenance of the Mass Spectrometer166
Changing the Rotary Pump Oil166
Changing the Molecular Sieve in the Foreline Traps167
Changing the Oil Mist Filters168
Maintenance of the Compressor (if Supplied)168
Drainage of the Compressed Air Water Trap (if Fitted)168
Changing the Helium Gas Bottle168
Mass Spectrometer Repairs169
Overview169
Venting the Mass Spectrometer170
Removing the Ion Source170
Removing the Source Flange170
Removing the Ion Source173
Replacing the Ion Source174
Fitting the Ion Source to the Source Flange174
Replacing the Source Flange176
Changing the Ion Source Filament178
Removing the Old Filament178
Positioning the New Filament179
Attaching the Filament Support Assembly to the Source180
Disassembly of the Ion Source181
Removal of the Magnet, Filament and Trap182
Disassembly of the Stack187
Disassembly of the Ion Box188
Dismantling the Trap Assembly190
Dismantling the Magnet Assembly191
Assembly of the Ion Source191
Folding Photo-Etched Components192
Trap192
Source Wraparound192
Filament Shield193
Rebuilding the Ion Box Assembly194
Rebuilding the Trap Assembly195
Rebuilding the Magnet Assembly196
Reassembly of the Stack197
Cleaning Procedures199
Rough Cleaning199
Pre-Cleaning199
Final Cleaning200
Cleaning the Flight Tube200
Cleaning the Penning Gauge200
Electronics Repair201
Removal of System Controller201
Refitting the System Controller203
Removal of the Bakeout Power Supply205
Replacing the Bakeout Power Supply206
Removal of the Electromagnet Power Supply206
Replacement of the Electromagnet Power Supply208
Removal of the Head Amplifier208
Replacement of the Head Amplifier209
Fuse Replacement211
Mains Inlet to Isoprime100211
System Controller212
Bakeout Supply Unit212
Electromagnet Power Supply213
Fault Finding214
Introduction214
Poor Operating Pressure214
On the Pirani Gauge214
On the Penning Gauge215
High Background Levels215
For Argon215
Dirty Background Scan216
Valves Cannot be Operated217
Poor Mass Spectrometer Peak Shape217
Non-Linear Signal218
Reference Gas Box218
Source Tuning218
Magnet Position218
Leak Checking Using Argon218

Isoprime 100 - Automated Peak Centering in Analysis

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