The MAP-215 type noble gas mass spectrometer is a Nier-type, high sensitivity, low volume system developed for the analysis of all noble gases (He, Ne. Ar, Kr and Xe). The mass spectrometer is equipped with a Faraday-cup and an electron multiplier for detecting low amounts of gas. Degassing of the samples can be carried out in different temeparture steps from 20 to 2000°C. Cleaning of the noble gases from the dirty gases (e.g. H2O, CO, CO2, hydrocarbons) is made by non- evaporable getters.