| 摘要 |
The addition of a grounded electrode in a special location with respect to the location of the two sensing electrodes of an existing piston-inverted cylinder apparatus used in the measurement of the electric charge condition of non-conductive particles suspended in a mildly conductive electrolyte such as tap water converts the known apparatus into one whose accuracy, reliability and useful life are greatly increased. The grounded electrode is located nearer the open end of the cylinder than are the two sensing electrodes, and the grounded electrode should have a surface area which is several times that of the two sensing electrodes. All three electrodes must be made of the same metal.
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