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- W40296945 abstract "The Multistation Offgas Analysis System (MOAS) is a fully automated instrument which can independently measure the gases emitted by up to four samples in containers heated in ovens. A mass spectrometer is used to determine accurately their flow rates. There are six interconnected high vacuum pumping stations, one for each of the sample containers, one for the mass spectrometer, and one for the calibrated leaks which are used to calibrate the mass spectrometer. Quadstar 421{trademark} is the software package marketed by Balzers, the manufacturer of the mass spectrometer. This software used by MOAS is a combination of Quadstar 421{trademark}, special routines, called sequences in the Balzers nomenclature, and compiled programs that controls MOAS. Tests are run repeatedly on each of the four oven stations, while stations that are not ready, or do not have a sample are skipped. While the computer is sitting idle between tests, the software monitors the vacuum system. If necessary, the software will shut down a pumping station that is not operating correctly. The status of pumping stations and tests, filenames for data and oven temperatures are stored on disk, so the software can recover from a power failure. The operator can use the software to start or stop testing, load parts, perform calibrations as necessary, and start up or shut down pumping stations. The software aids in routine functions, such as changing an ion gauge, by performing the required valve actuations automatically, and checking the pressure readings and turbopump speeds as necessary. The computer takes mass spectrometer sensitivity calibration data automatically, every week at 12:00AM on Sunday. An operator does not need to be present for these calibrations. The calibration data are saved and may be used or deleted by the operator at a later date." @default.
- W40296945 created "2016-06-24" @default.
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- W40296945 date "1994-10-10" @default.
- W40296945 modified "2023-10-14" @default.
- W40296945 title "Operator`s manual for the multistation offgas analysis system" @default.
- W40296945 doi "https://doi.org/10.2172/10191916" @default.
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