| 摘要 |
A method and device for detecting a liquid contaminant (16) in a body of another liquid which relies on a difference in electrical conductivity between the contaminant and the liquid body respectively. The device includes a sensor circuit (3) having two parallel paths - a detection path (7) and a reference path (9), and the detection path includes two contacts (4, 5) which engage the liquid body so that a liquid bridge (6) extends between them. A power source (10) is connectable to the sensor circuit to cause current to flow through that circuit and current will flow through the reference path regardless of the conductance of the liquid bridge. That reference path flow provides a reference from which various conditions of operation can be determined, including malfunction of the device. |
