1. The length of the extension into the mass spectrometer cavity is not appropriate, too long or too short will not work.
2, the gasket should be tight and tight, too loose there will be hidden dangers, too tight will crush the gasket.
Poorly sealed after opening the chamber when cleaning the ion source:
Seals on the door (Shimadzu's door, Agilent's cover) can cause air leaks if they are covered with a bit of hair or velvet that is undetectable to the naked eye. At this time, what is required in the general operation book is to wear nylon gloves to clean, but this is very important when dealing with the ion source, but for the processing of the seal ring, no gloves are better. The reason is that there will be some grease on the hand, as long as you apply a circle along the sealing ring, you can effectively eliminate the impact of the yarn. These oils are far away from the heating source and far from the ion source. They are basically macromolecule organics and have no effect on detection. When operating mass spectrometry at ordinary times, there is a rough numerical conceptual standard for how long the vacuum can reach under ventilating and non-ventilating conditions. If you change the column or clean the ion source, the vacuum rate is too far from the usual gap, we must first consider whether it is a problem of improper installation of air leakage, early shutdown shutdown processing. Solvent delay is a concept not found in other gas phase detectors. If you forget to set a reasonable solvent delay time, it will cause serious damage to the filament, which is a common mistake for mass spectrograph beginners. Another possible cause of serious consequences is that there is no hurry to disassemble the ion source when the temperature drops to room temperature. There have been cases where the machine was disassembled when it was hot, and it was not installed when it was cold. In terms of experimental status, the main problem is pollution. The treatment of inlet and column contamination is consistent with normal gas phase. As for the mass spectrometer detector, generally, more than 80% of the contamination is in the ion source part. We need to pay attention to the voltage after tuning. When it is raised to a certain extent, we must consider whether to clean the ion source. The quadrupole part does not need to be moved, and it is better not to be moved by the user. The day-to-day maintenance of GC-MS is easy to overlook the maintenance of mechanical pumps, mainly oil and molecular sieves.
Special note: Don't forget to have UPS when buying temperament.
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