標(biāo)準(zhǔn)號：ISO 6145-8-2005
中文標(biāo)準(zhǔn)名稱：氣體分析.用動態(tài)容積法制備標(biāo)定用氣體混合物.第8部分:擴(kuò)散法
英文標(biāo)準(zhǔn)名稱：Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 8: Diffusion method
標(biāo)準(zhǔn)類型：G85
發(fā)布日期：1999/12/31 12:00:00
實(shí)施日期：1999/12/31 12:00:00
中國標(biāo)準(zhǔn)分類號：G85
國際標(biāo)準(zhǔn)分類號：71.040.40
適用范圍：This part of ISO 6145 specifies a dynamic method using diffusion for the preparation of calibration gasmixtures containing component mole fractions ranging from 10?9 to 10?3. A relative expanded uncertainty ofmeasurement, U, obtained by multiplying the relative combined standard uncertainty by a coverage factork = 2, of not greater than ± 2 % can be achieved by using this method.By keeping the path between the diffusion source and place of use as short as possible, the method can beapplied for the generation of low-concentration calibration gases of organic components that are liquid at roomtemperature, with boiling points ranging from about 40 °C to 160 °C.This part of ISO 6145 is applicable not only for the generation of calibration gas mixtures of a wide range ofhydrocarbons at ambient and indoor air concentration levels, but also for the generation of low-concentrationgas mixtures of water.