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Improvement of filament-protection circuitry in a Finnigan model 251 mass spectrometer

Open-File Report 86-484

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Abstract

As delivered from Finnigan MAT, the emission current of the Leybold-Heraeus model IM210 ionization vacuum gage on a model 251 isotope ratio mass spectrometer can turn on as soon as the ' PUMP ON ' switch is depressed, before a good vacuum in the mass spectrometer is attained. The filament in the source of the mass spectrometer may turn on at the same time, thereby shortening its life or burning it out if the vacuum is poor. This design flaw can be corrected by a simple modification of the electronic circuitry. (Author 's abstract)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Improvement of filament-protection circuitry in a Finnigan model 251 mass spectrometer
Series title:
Open-File Report
Series number:
86-484
Edition:
-
Year Published:
1986
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
4 leaves ;28 cm.