Potentiometric sensor for measuring the co φ 2 φ - partial pressure

摘要

The electrode device has a pH glass electrode with a glass membrane across the end face of a cylindrical glass shaft sleeve. An annular surface applied to the shaft sleeve acts as an outer reference electrode (4), in contact with an electrolyte soln. (8) containing a hydrocarbon, forming a thin layer between the glass membrane and diffusion membrane allowing passage of the carbon dioxide. The annular surface lies at the same height relative to the shaft sleeve as an inner electrode (5) and is contacted by an electrolyte soln. layer with a thickness of below 0.5 mm.