| 摘要 |
893,185. Determining physical qualities. COMMISSARIAT A L'ENERGIE ATOMIQUE. June 3, 1960 [June 10, 1959], No. 19721/60. Class 37. A glass electrode for pH measurement has a thin-walled bulb 3 containing an amalgam 4 of lead, zinc, or tin, to which contact is made by a filament 5 insoluble in the amalgam even at a high temperature, and the amalgam is covered by a layer 9 of a liquid-insulating medium which may be methyl, or methylphenyl type silicone. The filament, which may be of tungsten, tantalum, or molybdenum, has a sheath of polytetrafluoroethylene 6 and passes through a stopper 7 of similar material, the external wire being provided with a screen 8. A hole 10 in the stopper prevents excessive internal pressure. The electrode may be completely immersed and may be used up to temperatures of 150‹ C. Characteristic curves are described with reference to Figs. 2-4 (not shown). |
