A high sensitive, precise programable mass spectrometer

A programable quadrupole mass spectrometer has been developed to make continuous observation of the gaseous pollutant materials and respiratory gases, . and to make continuous monitoring of the gaseous species present in the high vacuum atmosphere. The equipment has a multi-channel high speed programable scanner which consists of high speed IC switching circuits and accurate mass selector controls. A detailed description of the circuit and its function are given. A maximum scan speed is1msec per amu in the case of100channels. The equipment has a reproducibility of better than99. 6%and a detection limit of10ppm for SO2of the pollutant gases in the chimney flue.