DIN EN ISO 6145-11-2008 气体分析.动态容量法制备校准气体混合物.第11部分:电化学生成法
Gas analysis - Preparation of calibration gas mixtures using dynamic volumetric methods - Part 11: Electrochemical generation (ISO 6145-11:2005); English version of DIN EN ISO 6145-11:2008-11
This part of ISO6145 specifies a method for the preparation of calibration gas mixtures by using
electrochemical generation of a calibration component and introduction into a complementary gas flow. By
alteration of the gas flow or the charge passed through the cell electrolyte, it is possible to change the
composition of the gas mixture. The relative expanded uncertainty of the calibration gas content, U, obtained
by multiplying the relative combined standard uncertainties by a coverage factor, k = 2, is not greater than 5 %.
The method described in this part of ISO 6145 is intended to be applied to the preparation of calibration gas
mixtures in the volume fraction ranges (0,1 to 250) x 10-6.
NOTE 1 Gases that can be produced by electrochemical generation are oxygen (O2), hydrogen (H2), hydrogen
cyanide(HCN), hydrogen sulfide(H2S), chlorine(CI2), bromine(Br2), chlodne dioxide(CIO2), ammonia(NH3), nitric
oxide (NO), nitrogen (N2), carbon dioxide (CO2), phosphine (PH3), arsine (ASH3) and ozone (03),
NOTE 2 The mehts of the method are that a stable calibration gas mixture can be quickly prepared within minutes.
NOTE 3 Gas blending systems based on electroche mica[ generation and thermal mass flow controllers, with the facility
of computerization and automatic control, are commercially available. An example is given in Annex A