Field test report: on-line test of SIMP-III, particulate/gas analyzer at Morgantown Energy Technology Center, Morgantown, West Virginia

The SIMP-III is a particulate/Gas Analyzer incorporating a quadrupole mass analyzer with provision for both electron impact ionization of gases and surface ionization of particulates. It samples gas from near atmospheric pressure, passes the gas through a prechamber, where the pressure is dropped to about 1 torr, and then into a first vacuum chamber, where the pressure is maintained at about 10/sup -4/ torr. It is in the first chamber that the ionization occurs. Ions formed in the first chamber are electrostatically focussed through an aperture and enter a second chamber where the pressure is reduced further and where mass separations of the ions are made by a quadrupole mass filter.