Isolation Valve Layout for Rapid Ion Guide Exchange in Mass Spectrometers
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Solution Overview
Problem
Conventional mass spectrometers with Matrix Assisted Laser Desorption Ionization (MALDI) ion sources require complex and time-consuming processes to clean the first rod set ion guide, necessitating skilled engineers and causing significant downtime due to venting and re-establishing high vacuum.
Innovation Solution
An isolation valve is introduced to allow the first ion guide to be removed and cleaned without venting the downstream analyser, maintaining high vacuum in the analyser section, enabling non-skilled users to service the ion guide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first rod set ion guide is removed for cleaning, then the contamination problem is resolved, but the process becomes complex and time-consuming requiring skilled engineers
Solution Approach 1:
The vacuum system is segmented into separate chambers (source chamber and analyser chamber) that can be independently accessed and maintained. The ion guide assembly is designed as a removable module that can be extracted from the source chamber without affecting the analyser chamber vacuum, allowing cleaning to be performed independently of the main instrument vacuum system.
Solution Approach 2:
The first rod set ion guide is extracted as a removable component from the vacuum chamber. The ion guide assembly can be taken out through a access port in the source chamber, allowing it to be cleaned externally without requiring disassembly of the entire vacuum system or intervention by skilled engineers.
2Ease of repair
If the mass spectrometer is fully vented to remove the ion guide, then cleaning access is achieved, but significant downtime occurs due to re-establishing high vacuum
Solution Approach 1:
The vacuum system is divided into separate chambers (source chamber and analyser chamber) that can be independently vented and pumped. Only the source chamber needs to be vented for ion guide cleaning, while the analyser chamber maintains its vacuum, significantly reducing the time required to re-establish high vacuum after cleaning.
Solution Approach 2:
The ion guide assembly is extracted through an access port in the source chamber, allowing removal and cleaning without fully venting the entire mass spectrometer. This enables maintenance to be performed with minimal disruption to the overall vacuum system and reduces downtime.
3Reliability
If the first rod set ion guide is removed for cleaning, then contamination is eliminated, but the process requires skilled service engineers
Solution Approach 1:
The first rod set ion guide is designed as a self-contained removable assembly that can be extracted through an access port in the source chamber. This allows the ion guide to be removed, cleaned, and reinstalled by non-skilled users without requiring disassembly of the vacuum chamber or specialized technical knowledge.
Solution Approach 2:
The ion guide assembly is designed to be easily removable and cleanable by the end user without requiring skilled service engineers. The modular design with clear removal and reinstallation procedures enables users to perform routine maintenance themselves, reducing dependence on specialized technical support.
4Ease of repair
If the ion guide is cleaned by removing it from the vacuum chamber, then cleaning effectiveness is improved, but the process becomes time-consuming
Solution Approach 1:
The vacuum system is segmented into separate chambers, allowing the source chamber to be quickly vented and accessed for ion guide removal without affecting the analyser chamber. This segmentation enables rapid cleaning operations with minimal impact on overall system vacuum establishment time.
Solution Approach 2:
The ion guide assembly is extracted through a dedicated access port designed for quick removal and reinstallation. This extraction mechanism allows the ion guide to be removed for cleaning and reinstalled rapidly, minimizing the time the system is out of service while still enabling effective cleaning of the component.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A mass spectrometer is disclosed comprising a rotatable isolation valve (1) having a curved, spherical, cylindrical or concave portion. At least a portion of an ion guide (2) is positioned so as to extend within a swept volume of the isolation valve (1) enabling the ion guide (2) to be positioned close to a second downstream ion guide (3) and for ions to be transmitted from the first (2) ion guide to the second ion guide (3) with high ion transmission efficiency.